Peugeot 307 Heating Issue

I had something similar on my Peugeot 307, although a bit newer. Sounds like your water valve is toast. Think of it like a tap that's stuck halfway – not enough hot water getting to the heater matrix. Check the wiring carefully; sometimes it's just a corroded connector causing the issue.

Okay, thanks! So, when you say 'similar', was it the same symptoms – poor heating and an error code? And when you mention the wiring, specifically which wires should I be checking? Is there a common point where they fail?

Yep, same symptoms – freezing in winter! And the error code pointed to the water valve circuit. Honestly, tracing the wires is a pain. If the connector looks clean, you're probably looking at a faulty valve. Best bet is to take it to a workshop; they'll diagnose it properly and replace the valve if needed. I think the spare part and labor were 95€, so it shouldn't break the bank.

Thanks a lot for the insight! I'll check the connections again, but it sounds like a trip to the shop is in order. Your experience has saved me a lot of time, as I would've probably spent ages trying to fix something beyond my expertise. Will post back with the final diagnosis and solution. Turns out it was exactly as you said. The car is running smooth now.