2014 SKODA Octavia Combi RS Download Service & Repair Manual

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. Workshop Manual Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, Fabia III 2015 ➤, Kamiq 2019 ➤, Karoq 2018 ➤, Karoq 2020 ➤, Kodiaq 2017 ➤, Kodiaq 2019 ➤, Kushaq 2021 ➤, Octavia 1997 ➤, Octavia II 2004 ➤, Octavia II 2010 ➤, Octavia III 2013 ➤, Octavia III 2014 ➤, Octavia IV 2020 ➤, Octavia IV 2021 ➤, Rapid 2011 ➤, Rapid NH 2013 ➤, Rapid NH 2014 ➤, Roomster 2006 ➤, Scala 2019 ➤, Slavia 2022 ➤, Superb 2002 ➤, Superb II 2008 ➤, Superb III 2015 ➤, Yeti 2010 ➤, Yeti 2011 ➤ Air conditioning system with refrigerant R134a Edition 03.2022 Service Service Department. Technical Information

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. List of Workshop Manual Repair Groups Repair Group 00 - Technical data Technical information should always be available to the foremen and mechanics, because their careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a matter of course, be observed. Service All rights reserved. No reproduction without prior agreement from publisher. Copyright © 2022 ŠKODA AUTO a. s. D3E801B9571

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. Contents 00 - Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 General notes on the air conditioning system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Important instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Further documentation and information means . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.3 Principles of the air-conditioning technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4 Advantages of the air conditioning system - comfort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.5 Operation of the air conditioning system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.6 Refrigerant R134a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.7 Vapour pressure table for refrigerant R134a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.8 Properties of refrigerant R134a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.9 Identifying leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.10 Refrigerant machine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.11 General occupational safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.12 Using pressure tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.13 Safety precautions when working with extraction and filling systems . . . . . . . . . . . . . . . . 13 1.14 Safety measures when working on vehicles with air conditioning system and when using refrigerant R 134a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1.15 Basics for working on the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2 General instructions for refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.1 Components of the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.2 Extractor, filler and measurement valves for quick couplings of the AC service station on the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 2.3 Pressures and temperatures in the refrigerant circuit and its arrangement . . . . . . . . . . . . 27 2.4 Switch and sender on the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 2.5 Electrical components which are not fitted on the refrigerant circuit . . . . . . . . . . . . . . . . . . 33 2.6 The inspection and measurement work can be performed using the pressure gauge . . . . 34 2.7 Air conditioning service and recycling equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 2.8 Repair and maintenance instructions for refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . 36 3 Legal texts and legal regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3.1 Laws and regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 3.2 Verification procedure of refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4 Refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 4.1 Important repair instructions for air conditioning systems . . . . . . . . . . . . . . . . . . . . . . . . . . 39 5 Working with the A/C service station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 5.1 Important instructions for working with the A/C Service station . . . . . . . . . . . . . . . . . . . . . . 41 5.2 Connecting the A/C service station to the refrigerant circuit for measuring and testing . . . . 42 5.3 Empty the refrigerant circuit with the A/C service station. . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.4 Evacuate the refrigerant circuit with the A/C service station. . . . . . . . . . . . . . . . . . . . . . . . . 43 5.5 Fill the refrigerant circuit with the A/C service station. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.6 Operate the air conditioning system after filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.7 Fill refrigerant into the reservoir (filling cylinder or reservoir bottle) of the A/C service station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.8 Draining the A/C service station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 6 Leak detection on the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 6.1 Looking for leaks in the refrigerant circuit - important instructions . . . . . . . . . . . . . . . . . . . . 46 6.2 Leak detection on the refrigerant circuit with compressed air or nitrogen . . . . . . . . . . . . . . 47 6.3 Detecting leaks on the refrigerant circuit with the leak detector VAS 6196 or VAS 6201A . . 49 7 Removing contaminants from the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 7.1 Cleaning the refrigerant circuit with compressed air and nitrogen . . . . . . . . . . . . . . . . . . . . 56 7.2 Cleaning refrigerant circuit with refrigerant R134a (flush) . . . . . . . . . . . . . . . . . . . . . . . . . . 58 7.3 Principle circuit diagrams for different rinsing cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 7.4 Adapter for setting up the rinsing cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 Contents i

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. 8 Complaints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 8.1 Possible complaints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 8.2 Temperature test of cooling capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 8.3 Odour from the heating and air conditioning unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 9 Check the pressure in the refrigerant circuit (with the A/C service station) . . . . . . . . . . . . 79 9.1 Test requirements before the pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 9.2 Check pressures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 9.3 Continuation of the test depending on the arrangement of the refrigerant circuit . . . . . . . . 82 9.4 Pressure test for vehicles with throttle and catch pan (with AC compressor regulated from the inside) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 9.5 Pressure test for vehicles with expansion valve and fluid reservoir (with AC compressor regulated from the inside) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 9.6 Pressure test for vehicles with expansion valve, fluid reservoir and with regulating valve for compressor of air conditioning system N280 (with AC compressor regulated from the outside) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 10 Replace components of the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 10.1 Replace parts on the refrigerant circuit - General instructions . . . . . . . . . . . . . . . . . . . . . . 99 10.2 Components of the refrigerant circuit leaking or damaged - the refrigerant circuit is absolutely empty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 10.3 Components of the refrigerant circuit leaking or damaged - refrigerant is still in the refrigerant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 10.4 Replace AC compressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 10.5 Replace AC reservoir/desiccator/restrictor/expansion valve . . . . . . . . . . . . . . . . . . . . . . . . 102 10.6 Removing and installing, replacing regulating valve for compressor of air conditioning system N280 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 11 Tools and materials, which are available from the importer . . . . . . . . . . . . . . . . . . . . . . . . 109 11.1 Setting up tools and materials which are available from the importer . . . . . . . . . . . . . . . . 109 11.2 A/C service station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 11.3 Flushing device for the refrigerant circuits 6337/1 or follow-up models (manufacturer Behr) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 11.4 Flushing device for the refrigerant circuits 6336/1 or follow-up models (manufacturer Waeco) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 11.5 Leak detection system VAS 6196 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 11.6 Leak detection system VAS 6201A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 11.7 Adapter case of motor car set VAS 6338/1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 11.8 Release tools VAS 6127/3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 11.9 Socket T10364 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 12 Tools and materials, which are commercially available . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 12.1 Setting up tools and materials which are available from a dealer . . . . . . . . . . . . . . . . . . . . 114 12.2 Filling hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 12.3 Bottle connecting piece for pressure bottle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 12.4 Valve caps with replacement gaskets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 12.5 Pressure gauge battery with pressure reducer for nitrogen . . . . . . . . . . . . . . . . . . . . . . . . 116 12.6 Quick-coupling adapter for service connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 12.7 Tools, which you make yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 ii Contents

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. 00 – Technical data 1 General notes on the air condition‐ ing system (SRL001969; Edition 03.2022) ⇒ i1.1 nstructions”, page 1 ⇒ d1.2 ocumentation and information means”, page 2 ⇒ o1.3 f the air-conditioning technology”, page 2 ⇒ o1.4 f the air conditioning system - comfort”, page 4 ⇒ o1.5 f the air conditioning system”, page 5 ⇒ R1.6 134a”, page 5 ⇒ p1.7 ressure table for refrigerant R134a”, page 6 ⇒ o1.8 f refrigerant R134a”, page 8 ⇒ l1.9 eaks”, page 9 ⇒ m1.10 achine oil”, page 9 ⇒ o1.11 ccupational safety”, page 10 ⇒ p1.12 ressure tank”, page 12 ⇒ p1.13 recautions when working with extraction and filling sys‐ tems”, page 13 ⇒ m1.14 easures when working on vehicles with air conditioning system and when using refrigerant R 134a”, page 14 ⇒ f1.15 or working on the refrigerant circuit ”, page 15 1.1 Important instructions This workshop manual provides basic knowledge to foremen and mechanics, in order to carry out professional work on air conditioning systems for vehicles. In order to carry out professional work on air conditioning sys‐ tems for vehicles, you must have worked through the content of this Workshop Manual or completed a training course on the air conditioning system including general knowledge (possibly with a corresponding final test) and you must be able to implement these elements in practice. Only these workers are recognised as qualified to pursue the activities on air conditioning systems for vehicles. Note ♦ This workshop manual can also serve as training documen‐ tation. ♦ This Workshop Manual should be kept at the work place and it must be submitted at the request of the responsible supervisory authority, if required. ♦ Alternative or additional regulations may be valid in certain countries. Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 1. General notes on the air conditioning system 1

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. Caution Non-approved tools or materials (e.g. stop leak additive) can cause damage/deterioration to the system. Only tools and materials approved by the manufacturer may be used. There is no guarantee if non-approved tools or materials were used. 1.2 Further documentation and information means ♦ Workshop manual for type related repair work ⇒ Heating, Air Conditioning; Rep. gr. 87 ♦ ⇒ Current flow diagrams, Electrical fault finding and Fitting locations ♦ Self-study programmes, e.g. ⇒ Self-study pro‐ gramme No. 10; air conditioning system in the vehicle or ⇒ Self-study programme No. 25; Octavia - Climatronic ♦ Video programmes for occupational training ♦ ⇒ Electronic Catalogue of Original Parts “ETKA” ♦ ⇒ Catalogue of factory equipment and special tools 1.3 Principles of the air-conditioning tech‐ nology ⇒ p1.3.1 rinciples”, page 2 ⇒ a1.3.2 lways flows from a warmer substance to a colder substance”, page 3 ⇒ a1.3.3 nd boiling point”, page 3 1.3.1 Physical principles The four known aggregate phases of water also exist for the refrigerants of the air conditioning system. 1 - gaseous (not visible) Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 2 Rep. gr.00 - Technical data

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. 2 - vaporous 3 - liquid 4 - solid If water is heated in a container (heat absorption) rising water vapour is visible. If the vapour is heated even more through heat absorption, the visible vapour becomes invisible gas. The procedure is reversible. If the heat content is extracted from the gaseous water, this results first of all in vapour, from this the vapour turns into water and then into ice. A - Heat absorption B - Heat dissipation 1.3.2 Heat always flows from a warmer sub‐ stance to a colder substance Each substance consists of a mass of moving molecules. The fast moving molecules of a warmer substance give up a part of their energy to the molecules which are slower and have less heat. This slows down the molecular movement of the warm‐ er substance and the molecular movement of the colder sub‐ stance is accelerated. This happens until the molecules of both substances move with the same speed. Then they have the same temperature and no further heat exchange takes place. 1.3.3 Pressure and boiling point The boiling point of a liquid given in the tables always refers to the atmospheric pressure of 1 bar. If the pressure of a liquid changes, so does its boiling point. It is known, for example, that water boils at lower temperatures the lower the pressure. Based on the vapour pressure curves for water and refrigerant R134a it can be recognised, for example, that while maintaining pressure, by lowering the temperature, the vapour turns to liquid (in the condenser), or that, for example, by reducing the pres‐ sure, the refrigerant turns from the liquid state into the vapour state (evaporator). Vapour pressure curve of water Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 1. General notes on the air conditioning system 3

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. A - liquid B - gaseous C - Vapour pressure curve of water 1 - Pressure of the liquid in bar (absolutely) 2 - Temperature in °C Vapour pressure curve of refrigerant R134a A - liquid B - gaseous D - Vapour pressure curve of refrigerant R134a 1 - Pressure of the liquid in bar (absolutely) 2 - Temperature in °C 1.4 Advantages of the air conditioning sys‐ tem - comfort One of the basic requirements for a concentrated and safe driv‐ ing is the feeling of comfort in the vehicle interior. This comfort is only possible through the use of an air conditioning system, especially in warm temperatures and at high humidity. Open windows, an open sliding sunroof or a higher air flow rate cer‐ tainly contribute to the comfort, but there are disadvantages for the vehicle interior, such as: additional noise, draught, exhaust, unfiltered infiltration of pollen and dust (unpleasant for allergy sufferers). Through a controlled air conditioning system, in combination with a well-designed heating and ventilation system, the feeling of well-being and comfort can be achieved by controlling the indoor temperature, humidity and air movement, according to the external conditions. This is possible when the vehicle is stationary as well as when driving. Further important advantages of the air conditioning system are: Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 4 Rep. gr.00 - Technical data

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. ♦ The cleaning of the air injected into the interior (by the wet fins of the evaporator, for example, dust and pollen are washed out and evacuated with the condensation water). Temperatures in a medium-class car, eg: after a short driving time, outside temperature 30 ° C in the shade and vehicle under the sun: with air condition‐ ing system without air condi‐ tioning system Head room 23°C 42°C Chest 24°C 40°C Footwell 30°C 35°C 1.5 Operation of the air conditioning sys‐ tem The temperature in the passenger compartment is influenced by radiant heat through the window and by the contact heat emitted by metallic parts. In order to provide agreeable temper‐ atures for the passengers on very hot days, some of the ambi‐ ent heat must be evacuated. As it is a well known fact that heat spreads towards colder temperatures, an aggregate that generates lower temperatures has been fitted to the vehicle, i.e. the evaporator. Refrigerant is continuously evaporated in this evaporator. The heat required for this operation is drawn from the air flowing through the evap‐ orator. The refrigerant gas together with the absorbed heat is pumped out of the evaporator by the AC compressor. The AC compres‐ sor's compression work increases the heat content and the tem‐ perature of the refrigerant. It is now considerably higher than the ambient air temperature. The high-temperature refrigerant and its heat content flow to the condenser. There, because of the temperature difference between the refrigerant and the ambient air, the refrigerant re‐ leases heat into the ambient air via the condenser and liquefies. The refrigerant is also a heat conveyor. As it will be re-used, it is again pumped to the evaporator. For this reason, the basic principle of all air conditioning sys‐ tems is a circuit for refrigerants. Differences arise in the compo‐ sition of the aggregates. 1.6 Refrigerant R134a ⇒ d1.6.1 ata of the refrigerant R134a”, page 5 ⇒ n1.6.2 ames and designations of the refrigerant R134a”, page 6 ⇒ p1.6.3 oint”, page 6 ⇒ a1.6.4 spects of the refrigerant R134a”, page 6 1.6.1 Physical data of the refrigerant R134a The evaporation and condensation process is the procedure used for all air conditioning systems in vehicles. Thus it works with a lightly boiling substance, which is described as a refriger‐ ant. The refrigerant used is Tetrafluorethan R134a, which boils at -26.5°C under a pressure of 1 bar. Chemical formula CH2F-CF3 or CF3-CH2F Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 1. General notes on the air conditioning system 5

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not permitted unless authorised by ŠKODA AUTO A. S. ŠKODA AUTO A. S. does not guarantee or accept any liability with respect to the correctness of information in this document. Copyright by ŠKODA AUTO A. S. Chemical designation Tetrafluorethan Boiling point at 1 bar -26.5 °C Solidification point -101.6 °C Critical temperature 100.6 °C Critical pressure 39.56 bar (absolutely) 1.6.2 Trade names and designations of the refrigerant R134a The refrigerant R134a is currently available under the following trade names: ♦ H-FKW 134a ♦ SUVA 134a ♦ KLEA 134a Note ♦ In other countries, other trade names may also be common. ♦ Among the wide range of different refrigerants, only this re‐ frigerant should be used for automobiles. The designations “Frigen” or “Freon” are trade names. They also apply to refrigerants that are not intended to be used for automobiles. 1.6.3 Critical point The critical point (critical temperature and critical pressure) means that there is no divide over the same interface between the surface of the liquid and the gas. A substance is always gaseous when it is above its critical point. At temperatures below the critical point, all types of refrigerants in pressure tanks have a liquid and a gas phase, which means that a gas blanket is present above the liquid. As long as gas is still present in the tank aside from liquid, the pressure depends upon the ambient temperature ⇒ p1.7 re‐ ssure table for refrigerant R134a”, page 6 . 1.6.4 Environmental aspects of the refriger‐ ant R134a ♦ R134a is a fluorinated hydrocarbon (PFC) and contains no chlorine. ♦ R134a has a lower atmospheric lifetime than the refrigerant R12. ♦ R134a does not attack the ozone layer. ♦ The contribution of R134a to the greenhouse effect is by a factor of 10 less than the effect of the refrigerant R12. 1.7 Vapour pressure table for refrigerant R134a The vapour pressure table is decisive for each refrigerant used in the literature for refrigeration technicians. From this table can be read which vapour pressure above the liquid column in the vessel pushes when the temperature of the reservoir is known. Citigo 2012 ➤, Fabia 2000 ➤, Fabia II 2007 ➤, Fabia II 2009 ➤, Fabia II 2011 ➤, ... Air conditioning system with refrigerant R134a - Edition 03.2022 6 Rep. gr.00 - Technical data

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