Answer
Nov 08, 2025 - 04:58 AM
On those older Renault Trafic T1000 vans, the cooling system is pretty simple, but the filler isn’t always obvious because depending on engine variant the radiator cap might be tucked low or there’s a separate expansion tank.
Here’s the general way to do it:
- Find the expansion/overflow tank — It’s usually a plastic tank mounted high up in the engine bay (often on the right-hand side). That’s the one you top up — not the radiator itself.
- Engine must be cold — Don’t open the system if the engine’s hot — it will spray.
- Use the right coolant mix — Renault from that period generally uses ethylene glycol coolant (green or blue). A 50/50 mix with distilled water is standard. Don’t mix types if you’re not sure — better to flush later, but for now top with whatever is already in there.
- Fill to the “MAX” line on the tank — Not all the way full — just up to the marking.
- Start the engine with the cap off — Let it idle a couple minutes. This helps air bubbles burp out of the system. You’ll usually see bubbles come up in the tank.
- Put the heater inside the van on full hot — This opens the heater core so coolant flows through it (otherwise you may trap an air pocket).
- Top off again if the level drops — Once the bubbles stop and the level stabilizes, put the cap back on.
I recommend taking it for a short drive, let it cool, then recheck the tank. If it dropped again, it just means more air worked its way out — top it back up to MAX.
Hope this helps 👍🏻
