g3justin

Thanks! Mostley to get better gas mileage and save where on the compressor, when it come springtime that's when I found out needs the compressor to dehumidify the windows a fair amount of previous cars I owned had bad AC systems and ended up just being pure heat during the winter. Right now I have the fuse pulled because I'm assuming at 32 the compressor supposed to not engage as I know below a certain temperature It could damage it, I have a feeling the fan and compressor would engage no matter what the air temperature sensor is reading whether it be 30 or -1. Don't want to damage the AC system to get this fixed. It's an odd situation it's fan off, unless you turn it on defrost, with the fuse pulled did not think it would call for fan and did not before untell today, but it may so that's not the unusual part. Engine can be ice cold take it out of defrost/AC even turning HVAC completely off the fan still stays running on low speed. so trying to narrow it down if it's the fan controller mounted on the side of the fan shroud (hopefully) or worst-case a problem with the PCM of the car turning it on when it's unnecessary to do so. Only way I can get by with doing heat now without fan is keep HVAC off when I start the car let it get up to full operating temp, then turn it on windshield defrost,fan comes on and stays on no matter what setting you have it then after even if HVAC is off. Only time it resets per say is when you start the car and do not select any mode that would cause the AC to come on. This one's got me stumped somewhat? Think I'm going to have to take it to a mechanic with a high end scan tool to see if the PCM is calling for fan or not for the relay/controller on the fan is just sticking on. Neither the less waste of gas sitting at idle for 10 minutes to get up to operating temp then just start to turn on defrost and wait another 10 minutes to clear the windows. fan never turned on before and car never goes over 190 degrees, so probably could be "ok" during the winter time just unplugging the fan but I have a feeling it would throw a code and possibly the CEL because it could not communicate with the fan controller and in summertime would definitely possibly be needed and definitely for the AC. Definitely not a problem of not working a problem of working when it's supposed to "not"

Have a 2009 Ford Fusion 2.3L, just did the thermostat (Fun!!) A few weeks ago As the engine was not getting up to Temp and sure enough thermostat was half stuck open. Up to now everything after that was fine, heats up fairly quickly and verified with the scan tool was running between 180 degrees and 190 ECT. Noticed today was taking a while to heat up, opened the hood and seen the radiator fan was runing it's 32 degrees out, I have the AC compressor fuse pulled as I don't want it running with the defrost, radiator fan never came on with the fuse pulled in defrost even before so honestly did not know if it worked or not till today. Anyways when you put it in windshield defrost the fan comes on now (can see the car knows it's 32 degrees out is the ambient temperature with the scan tool) figured the fan might still come on why now I have no clue, problem is when I turn off all HVAC the fan still stays running and keeps the engine around 170 so undertemp. Stays off as long as you keep the HVAC off defrost but once you go to defrostand then change it to any other setting or off the fan is on permanently to you turn off the car and restart it. Being it did not do that before, I'm leaning towards the fan control module on the side of the fan shroud? has anybody had similar symptoms to this with a bad controller? engine is not getting hot enough to engage the fan with no AC compressor running and did not up to recently. Any help would be appreciated thanks!.