Hey all,
Having intermittent HVAC issues with my wife's '14 Edge Limited, 3.5L, Dual Zone climate.
All issues occur while running the HVAC in manual mode - both sides set to same temp. No DTCs present in any of the modules.
End of Last Summer - while running AC, the temperature would abruptly go from cold to less cold as if we increased the temp on the controller. This only happened like twice, so I couldn't pinpoint the issue.
Last Winter - while running the heater on hottest setting, the temperature would randomly decrease from hot to a warm on both sides. Adjusting the temp down using the buttons would make cooler air, but turning the temp back up would only yield warm air - could not get the hottest air back. I eventually noticed if we turn off the HVAC unit and turn back on (using the power button) I would get very hot air again for ~5 minutes until the issue would occur again. I tried performing the HVAC reset procedure and unplugged the blend door actuators several times, but this did not correct my issue. This happened all last winter - could easily replicate and was not intermittent.
This Summer - AC has been running fine for months, however just this week the car was blowing heat from the passenger side and AC from the drivers side (seems to be a common issue). I performed the HVAC reset and it correct this issue.
I'm not sure what direction I should take to correct this issue. The heat issue almost seems like a blend door problem, except for the fact that both sides mirror each other exactly - I cant imagine both doors have failed exactly the same. Could it be the HVAC control module?
Could it possibly be a partially clogged heater core? Seem too new to have this problem and I've never had a clogged core cause intermittent issues like this.
I searched the forum and read most of the threads related to HVAC issues. The only thread that sounded exactly like what I am dealing with was caused by a faulty heater/temperature control valve. But it was an ecoboost engine. My car does not have one of those valves. I hate just throwing parts at an issue like this. Any input on how to proceed?
Thanks