Ford F-150 - 1997-2003 :: Compressor Still Engaged When Temp Control Switch Turned To Warm
May 26, 2017
1997 F150... What part of the control system tells the compressor to turn on and off? After not having air conditioning for a year or more I replaced the broken blend door.
When the a/c is turned on and the temp control switch is turned to cold, I get cold air. When I turn the temp control switch to warm, the air coming out of the vents is very warm. However when I do this I noticed that the compressor is still engaged. I think that at this point the compressor should disengage.
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I have a 2003 2.8 GLI and my compressor clutch will not engaged i provided the clutch with a direct power and ground from the battery and it engaged. i also went to the junk yard and got a couple of Fan Control Module ($4 each) and it still does not engaged.
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I have a 97 expedition that i am having trouble with. It has front and back airconditioner. The compressor is short cycling real fast. Warm air in the front and cool air in the back. I put a can of freon in but still not cooling. The gauges are between 30 psi and 50 on the low side. The high side is between 100 and 150 psi. The ambient temp was 80 degrees.....
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I find that my 2010 V6 is always cold in the winter. I always need to turn the temperature control to the highest, but there is still not enough heat. This morning, it was -11c outside. After I drove 10 KM (about 20 minutes) , inside the car is still very cold. My feet were frozen. The air from the vent is only warm, not hot. I also find that this car takes longer to warm up. The temperature gauge won't start to move until I drive about 2.5KM.
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I have a 05 Avalon XLS and I've just discovered an issue with my climate control. It's that time of year that things are warming up so we started using A/C and found that driver's side vents are blowing warm air while passenger side vents are blowing cold. I've tried varied temps and dual mode on and off as well as auto and manual control. Nothing makes a difference. I suspect some sort of thermostat for the driver's side, but I really have no clue.
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My 2001 Expedition 5.4L sat for 2+ years and due to a new child, I put it back on the road late last fall. Last week, we had our 1st "must use AC" day and it didn't work.
I listened to see if the compressor was cycling and it never engaged. I picked up a gauge and r134a kit.
Outside temp was about 60F, I think my therm was showing 57F to be exact. When I checked the low side pressure with the engine off, the gauge reading was below 15. It made sense that the compressor wouldn't start at the pressure. I put in about a 1/2 can with the motor running A/C on max and it was showing 40, but still no compressor cycling. I then shut the motor down, let it sit for about 3 mins and restarted. This time, the compressor started to cycle, it was cycling quickly though, I'd say about every 3 seconds.
With the compressor cycling, the pressure would jump from 17 to 40. With the motor off, it would read 50. Still no cold air. I put in about 14oz of R134a.
I guess what I need to know is if I should I keep adding R134a until it stabilizes around 40, even when the compressor is cycling? Also, where should the static pressure be? It's sitting at 50 now. I've been told it should be around 80, but I'm thinking that might be dependent on outside temp.
BTW, I'm now thinking that the reason that I'm not getting cold air and the compressor keeps cycling is because I need to add a lot more R-134a. I think when the compressor starts and draws coolant, the low side pressure drops to low, causing the compressor to turn off. When the compressor cycles off, it sees the low side pressure at 40 and starts it up again causing the coolant draw and low side pressure to drop to low again. Am I right on this thought? It looks like I'll need to add another can to get the pressure to stay above 22 when the compressor is running.
One other thing... How much R-134a the system takes? I need to know because I have access to a vacuum.
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