Mustangfreak Posted July 21, 2016 Report Share Posted July 21, 2016 I have a 2010 MKX and the HVAC system is acting up. With the controls set to max fan speed, sometimes it'll blow hard, and then sometimes itll blow so soft you can't tell. And then sometimes it will not blow at all. And it seems that the hotter it is outside, or the longer the car is driven, the weaker it'll blow over time. It's really a gamble when it comes to this. Some days it'll work, and other days like today it won't work at all. Is it the blower motor resistor? The blower motor itself? Can I jerry rig this system to work until I can afford to buy new parts? Thanks guys. Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted July 21, 2016 Report Share Posted July 21, 2016 I had this happen before finally the fan motor gave out. Not to say this still couldn't be the resistor, though, that's the difficult part. The TYC fan motor from Amazon or RockAuto is a fairly low-priced DIY-install part. A bit noisier than Motorcraft, but apparently blows more air as well. I remember at least one person having the resistor being the issue, seach the forum for "blower resistor", should get a hit. Quote Link to comment Share on other sites More sharing options...
Mustangfreak Posted July 22, 2016 Author Report Share Posted July 22, 2016 (edited) I had this happen before finally the fan motor gave out. Not to say this still couldn't be the resistor, though, that's the difficult part. The TYC fan motor from Amazon or RockAuto is a fairly low-priced DIY-install part. A bit noisier than Motorcraft, but apparently blows more air as well. I remember at least one person having the resistor being the issue, seach the forum for "blower resistor", should get a hit. I did a search at first and not everyones symptoms were the exact same as mine, so I thought I'd make a post as well. I called my aftermarket warranty company and they said the control module and blower fan were covered, but the resistor is not. So I think I'm gonna replace the resistor myself, and if that doesn't fix it I'll take it to the dealership. Edit: After seeing the TYC price on Rock auto, its not worth it to take it to the dealer. I have a $100 deductible, so I'd be wasting money. Edited July 22, 2016 by Mustangfreak Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted July 22, 2016 Report Share Posted July 22, 2016 (edited) Isn't the resistor completely out of the circuit when the blower is set to high? The HVAC Control Module decides whether to pass current through each leg of the resistor or go direct to the motor. Edited July 22, 2016 by enigma-2 Quote Link to comment Share on other sites More sharing options...
jlkansascity Posted July 22, 2016 Report Share Posted July 22, 2016 I would be curious what you figured out on this, my Ford Edge seems to have the same behavior. I was testing yesterday to see if maybe the evaporator core was freezing up due to low freon. I was driving across LA and back and here's my preliminary testing. If I turned the temperature as LOW as it would go, and the fan on HIGH, within about 20 minutes the air flow got slower and slower to the point it was barely moving air. Then I turned the AC OFF and the fan OFF. Drove 15 minutes and turned fan back ON and temp to LOWEST and it worked great again. So to test if that was from a frozen evaporator (which would act like that more or less), I then kept the fan on HIGH, but turned the AC to about 78 instead of 60. Drove for 40 minutes with no issues. Slowly lowered temperature to around 72 and the fan still kept blowing full speed. So, in my case I'm suspicious that the evaporator core is freezing due to low freon. I'm going to see if there is a way to get a visual on the evaporator to confirm. I'd be interested to know what your fix ends up being. Quote Link to comment Share on other sites More sharing options...
Mustangfreak Posted July 28, 2016 Author Report Share Posted July 28, 2016 I would be curious what you figured out on this, my Ford Edge seems to have the same behavior. I was testing yesterday to see if maybe the evaporator core was freezing up due to low freon. I was driving across LA and back and here's my preliminary testing. If I turned the temperature as LOW as it would go, and the fan on HIGH, within about 20 minutes the air flow got slower and slower to the point it was barely moving air. Then I turned the AC OFF and the fan OFF. Drove 15 minutes and turned fan back ON and temp to LOWEST and it worked great again. So to test if that was from a frozen evaporator (which would act like that more or less), I then kept the fan on HIGH, but turned the AC to about 78 instead of 60. Drove for 40 minutes with no issues. Slowly lowered temperature to around 72 and the fan still kept blowing full speed. So, in my case I'm suspicious that the evaporator core is freezing due to low freon. I'm going to see if there is a way to get a visual on the evaporator to confirm. I'd be interested to know what your fix ends up being. I'm going to try this and report back as well. Is refilling the freon easy on these cars? Quote Link to comment Share on other sites More sharing options...
PaulSchott Posted July 29, 2016 Report Share Posted July 29, 2016 Low pressure side is buried on the left side (passenger) all the way under the air intake cowling. Really hard to connect to. Quote Link to comment Share on other sites More sharing options...
Mustangfreak Posted August 15, 2016 Author Report Share Posted August 15, 2016 I would be curious what you figured out on this, my Ford Edge seems to have the same behavior. I was testing yesterday to see if maybe the evaporator core was freezing up due to low freon. I was driving across LA and back and here's my preliminary testing. If I turned the temperature as LOW as it would go, and the fan on HIGH, within about 20 minutes the air flow got slower and slower to the point it was barely moving air. Then I turned the AC OFF and the fan OFF. Drove 15 minutes and turned fan back ON and temp to LOWEST and it worked great again. So to test if that was from a frozen evaporator (which would act like that more or less), I then kept the fan on HIGH, but turned the AC to about 78 instead of 60. Drove for 40 minutes with no issues. Slowly lowered temperature to around 72 and the fan still kept blowing full speed. So, in my case I'm suspicious that the evaporator core is freezing due to low freon. I'm going to see if there is a way to get a visual on the evaporator to confirm. I'd be interested to know what your fix ends up being. This did not work. Right now the fan is not blowing at all, and its 95* avg right now during the day. Before when it would work a little bit, it seemed that the hotter it was outside, the worse the problem was. We had a couple of days of rain, and it got down to 85, and even down to 80 and the fan worked great and wouldn't slow down. Is it the resistor for sure now? Or something else? Quote Link to comment Share on other sites More sharing options...
WWWPerfA_ZN0W Posted August 15, 2016 Report Share Posted August 15, 2016 PINPOINT TEST Q: THE BLOWER MOTOR IS INOPERATIVE 2011 Edge Pinpoint Tests for Inoperative Blower.pdf Quote Link to comment Share on other sites More sharing options...
Mustangfreak Posted August 26, 2016 Author Report Share Posted August 26, 2016 just replaced the resistor and it started working, at half speed again. Get home and its barely blowing. Just went out to check the filter, and now it doesnt work at all. What the heck. I'm sick of this problem. What could be wrong now Quote Link to comment Share on other sites More sharing options...
heliguy Posted July 6, 2017 Report Share Posted July 6, 2017 i am similar problem. 2011 edge. BLower cycles on and off. on for 5 sec off for 2 secs. replaced resistor but no change Quote Link to comment Share on other sites More sharing options...
enigma-2 Posted July 8, 2017 Report Share Posted July 8, 2017 Why not try replacing the blower motor and fan assy. Thirty or forty bucks. No more problem. https://www.amazon.com/gp/search?ie=UTF8&camp=1789&creative=9325&index=automotive&keywords=blower+motor&linkCode=ur2&tag=viglink21335-20 1 Quote Link to comment Share on other sites More sharing options...
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