A/C blows heat. Compresser and all works. Any idea?

a/c heater blend door actuator is stuck on hot.if you sit inside the car with the windows up and switch to on,not start,turn the knob from hot to cold slow and you should hear a little humming noise when the knob is turned.if no humming when doing this,the a/c heater blend door actuator is bad,and stuck on HOT.

I had a similar issue with my 2011 Ford Fusion. With help from forums all over, the issue was narrowed down to 1. Blend Door Actuator 2. EVAP Temp Sensor 3. HVAC Control Module. Since the blend door was the easiest to get to, I replaced it first but it did not resolve the issue. I was able to get OHP Ford ELMconfig USB device from Amazon for about $30 and using Forscan software on a laptop I was able to rule out the evap sensor. I did not want to spend over $200 for a HVAC control module and was able to buy used on ebay for $30. Replaced it last night and my a/c has worked perfect since. Hope this helps.

2010 Ford Fusion - Cold air for about 15-30 seconds then it would switch to really hot air each time I start the vehicle. Fix: Replaced the HVAC Module (A/C switches on the center console). $225 at AutoZone - Dorman A/C Selector Mode Switch 599-228. Not a difficult job. How-to Video: https://www.youtube.com/watch?v=ThjrCiGtn-A Remove storage compartment on top of dash, 8mm bolts under rubber mat. Then pry up from the front then forward to remove from the tabs. Must cut safety strap that is attached just under the Hazard Lights Switch. Remove silver trim ring around Gear Shifter. Pop up the front of the trim panel around Shifter that makes up the top of the center console around the shifter. Pop up the front by going through the whole where the silver trim ring was. Do not need to remove the entire piece, just the front so you can, Pop up the charging port/change cup in front of it and remove. Remove the two 7mm bolts at the top of the radio rack trim panel. They were hidden under the storage compartment that you removed earlier from the top of the dash. Pry off the entire radio rack/HVAC Module trim panel. Remove the four electrical connectors behind the panel. All release by a push button. Remove the HVAC Module by removing the four T20 star bolts The other common causes of the A/C acting this way is; 1) Blend Door stuck. Test this by; Turn battery power on but do NOT start the car. Turn on the HVAC power (push the button). Slowly turn the Temp Control knob from Cold to Hot. If the Blend Door is working, you will hear it (humming) as it moves. The sound comes from under the dash, above the gas pedal. 2) A/C Evaporator Temp Probe Sensor. This is the worse one to fix because the entire dash must be removed to replace the $20 part. There is a quick easy workaround by installing a resistor wire between two wires that are going into a multi-plug behind the glove compartment door. https://www.instructables.com/id/Quick-fix-workaround-Ford-Fusion-AC-evap-sensor/