Everest Low Heating Output

Greetings. I have a Ford Everest as well. I did encounter similar symptoms some time ago; reduced heating performance accompanied by diagnostic trouble codes pointing towards the water valve circuit. Before condemning the valve itself, have you performed a thorough inspection of the relevant wiring harness for signs of corrosion or physical damage? Disconnecting and reconnecting the connector several times may also help to dislodge any contaminants that could be interfering with proper electrical contact. Although seemingly intact upon visual examination, internal wire breaks are not uncommon and could potentially explain the observed malfunction.

Thanks for the quick reply. When you mention 'thorough inspection', what exactly did you look for? I gave it a quick once-over, but maybe I missed something. Did you experience coolant loss as well?

By 'thorough inspection', I am referring to a close examination of the entire wiring harness associated with the water valve circuit, paying particular attention to areas where the harness is routed near heat sources or sharp edges. Check for any signs of chafing, melting, or cracking in the insulation. Additionally, examine the connector itself for bent or corroded pins. Use a multimeter to conduct a continuity test of each wire in the harness, both with and without the connector plugged in to simulate real-world operating conditions. Regarding coolant loss, it was not present in my particular case, although it is conceivable that a leaking water valve could lead to such a condition, independent of the described electrical fault. Ultimately, I had to take my vehicle to the workshop.

Appreciate the detailed explanation. Sounds like I need to dig deeper than I initially did. Given your experience, I'll probably take it to the workshop to get it sorted. The error codes match what I saw, and they quoted me around 95€ to replace the water valve if that's the problem. Thanks for the help!