RCZ Overheating Slow Warmup

My 2011 Peugeot RCZ with a gasoline engine is overheating like crazy and takes forever to warm up. I'm thinking coolant leak, but I can't find any signs. Coolant level seems okay, but the temperature gauge is all over the place. Could it be the water pump, or is something else messing with my temperature control? Any ideas?

4 comment(s)

I had similar symptoms with my RCZ. Sounds like a defective map thermostat, to be honest. They're known to cause those exact issues.

A defective thermostat, huh? Where is that thermostat located, and is it a pain to get to? Also, did you notice any coolant leak when yours went bad, or just the overheating issues?

The map thermostat is integrated into the thermostat housing. You will need to replace the entire unit. I recommend going to a workshop to do so. There was no noticeable coolant leak, just the overheating and slow warm-up, as you described.

Thanks for the heads-up about the thermostat! Took it to the shop, and you were spot-on that was exactly the issue. Cost me about 350€ to get it sorted. Appreciate the help!

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