farmerjg Posted December 30, 2022 Share Posted December 30, 2022 (edited) 2015 Fusion SE 2.5 non-EcoBoost 107k miles Maybe a little misleading title, but not sure how to explain it better. Last week my car was covered in ice, but it was only 25F, so not terrible on that particular day. I let my car warm up on defrost for 10 plus minutes (full blower). When I got in, the air wasn't 25° cold, but it certainly wasn't what one would expect for a hot car. Also, the temp gauge was buried on low. As soon as I put it in reverse the blower started blowing extremely hot air and the temp gauge started to rise and within ten seconds was at normal operating range. And I know what air feels like from a failed open thermostat, this was colder than that. Now, I hadn't put any more thought into it, but at the end of summer this was happening with my AC. I could warm the car up to get the air going, but it would just be slightly cooler than ambient air until I put the car in gear and then it would blow freezing cold air. Immediately. Just to get this out of the way, my coolant levels are fine and I operate at a good temp when driving. I don't think this is a coolant issue. So, what controls temp output of the HVAC system? Because this feels an awful lot like something is not commanding the right temperature. Do I have an electronic T-stat (or something like it) that's possibly not commanding until the car is in drive? Edited December 30, 2022 by farmerjg Added model 0 Quote Link to comment Share on other sites More sharing options...
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