chaosboss Posted May 12, 2018 Report Share Posted May 12, 2018 So I am hoping somebody has had the same problem that I am trying to figure out and can help me out. Lately when I turn on my AC when leaving home the air will blow cold as long as I am driving down the road. When I come to a stop light it starts to blow warm air. However, it only does this for about 10 to 15 minutes before it starts to work correctly and blow cold as normal. Yesterday for the first time while going somewhere all of a sudden I look down and my temp gauge is pegged in the red hot zone. I quickly get to a service station and start to deal with the problem. Now pretty much just as quick as it jumped up it came back down to normal zone. I drove home but left the AC off as I was certain that the AC was the cause. Also as of late when I have turned on my AC you can feel the load on the car and it almost stumbles for lack of better words when I turn it on... maybe about 70% of the time with the other 30% operating as normal as it should. I have done some reading and troubleshooting and this is where I am at. I have narrowed it down to my cooling fan will kick on once it reaches temp and works like it should. When I turn on the AC on max setting (or any other lower setting) the fan for the AC system does not and 97% of the time will not kick on. If I play with the AC on/off control I can sometimes get it to engage the compressor clutch and kick on. (I have checked this by stopping in the middle of the road and pop the hood and see just which fans might be working.) So I am wondering if maybe I just might get lucky and this just might be a compressor relay? As opposed to a whole fan assembly? Thank you in advance for any help you may have to offer. Quote Link to comment Share on other sites More sharing options...
omar302 Posted May 12, 2018 Report Share Posted May 12, 2018 I had my MKX's fans both working but not up-to normal speeds. In other words, the will be running but not at the required speed which caused my AC to not cool at idle. So checking the fans under the hood was not a good indication. 2 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted May 12, 2018 Report Share Posted May 12, 2018 (edited) I had same problem. Dealer changed the fans under extended warranty. He also checked a/c refrigerant levels and topped off. Said it was normal after fan failure. Fans needed to blow air across radiator at idle, not needed above 30 mpg as there's sufficient airflow. Edited May 12, 2018 by enigma-2 1 Quote Link to comment Share on other sites More sharing options...
chaosboss Posted May 13, 2018 Author Report Share Posted May 13, 2018 Omar did they give you a reason as to why your fans were not working at full capacity? Quote Link to comment Share on other sites More sharing options...
chaosboss Posted May 13, 2018 Author Report Share Posted May 13, 2018 (edited) What is the extended warranty? I only had 36,000 mile bumper to bumper and a 60,000 mile powertrain warranty. Edited May 13, 2018 by chaosboss Quote Link to comment Share on other sites More sharing options...
omar302 Posted May 13, 2018 Report Share Posted May 13, 2018 Omar did they give you a reason as to why your fans were not working at full capacity? No, as I did the diagnosis myself. I remembered that during summer the fans would run at a very high speed that it becomes annoying to anyone standing in front of the car, but when A/C became weak, the fans never ran at that high (noisy) speed. Quote Link to comment Share on other sites More sharing options...
chaosboss Posted May 13, 2018 Author Report Share Posted May 13, 2018 Omar may I ask what you did to fix the problem? Quote Link to comment Share on other sites More sharing options...
omar302 Posted May 13, 2018 Report Share Posted May 13, 2018 (edited) Replaced the fan assembly (both fans) with a new MotorCraft assembly. Edited May 13, 2018 by omar302 Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted May 13, 2018 Report Share Posted May 13, 2018 What is the extended warranty? I only had 36,000 mile bumper to bumper and a 60,000 mile powertrain warranty.An extended warranty is something that you purchase from your dealer (or another dealer) to extend the warranty on your car for several years / miles. I currently have 110k in my 09 MKX and am still under powertrain extended warranty (for two more years). If you Google "ford extended warranty" and select ford warranties from actual on-line Ford dealers (not an aftermarket warranty, which are mostly garbage at rediculus prices), print them out and take to local dealer, they will match price. There are different levels you can purchase, like full coverage (like what you had when the car was new), powertrain (what I currently have), and one in between (forget what it covered). There are several different levels that you can choose from. Prices vary based on what you want covered and for how long/miles. I took "powertrain" for three years, as I want to protect against a water pump failure (new engine) and PTU failure (actually my PTU was replaced under my last extended warranty). 1 Quote Link to comment Share on other sites More sharing options...
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