Answer
Jan 07, 2026 - 03:57 PM
If you are watching your temperature gauge climb in traffic and starting to panic, don't worry; you aren't alone. The operating temperatures on the C5 Corvette are notoriously high. Many owners think their car is overheating when, in reality, it is doing exactly what GM programmed it to do.
According to the factory specifications in this manual, the ECU won't even think about turning the fans on until the engine gets quite hot (mostly for emissions reasons). Here are the exact factory trigger points for the LS1:
- Low Speed (Fan 1): Commands ON at 226°F (108°C).
- High Speed (Fan 2): Commands ON at a scorching 235°F (113°C).
Unless you have the A/C on (which forces the fans to run), seeing temps in the 220s and 230s is considered "normal" operation for this car, as crazy as that sounds.
That said, if you want to verify your system is actually working correctly—or if you suspect a bad relay or sensor is keeping them off past those points—this manual has everything you need. It includes the complete cooling system wiring diagrams, the precise temperature thresholds for every condition, and the step-by-step testing points to troubleshoot the fans from the fuse box to the PCM.
