Bad AC compressor or something else?
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Bad AC compressor or something else?
Good evening everybody!
New to the forum here and have previously solved issues using threads from here, so it was time to join!
Been having an issue lately with the AC system on my 2010 4.6L F150. The AC system is not working properly and is only blowing air the same temp as outside. In other words, if its 60 degrees in the morning the AC will blow cool, but later in the day its blowing warm. Pushes air no problem, but living in Florida, it's mainly warm air. Compressor clutch is kicking on and off fairly rapidly when on max AC setting (5-10 seconds on, then 5-10 seconds off). Hooked up gauge to low pressure side and the readings were 60psi WITH compressor on, then fell to 30psi when the compressor turns off. Any suggestions on where to start? Haven't done too many AC fixes before, so any ideas would help. Potentially a bad compressor? Overcharged lines? Thanks in advance guys
Jared
New to the forum here and have previously solved issues using threads from here, so it was time to join!
Been having an issue lately with the AC system on my 2010 4.6L F150. The AC system is not working properly and is only blowing air the same temp as outside. In other words, if its 60 degrees in the morning the AC will blow cool, but later in the day its blowing warm. Pushes air no problem, but living in Florida, it's mainly warm air. Compressor clutch is kicking on and off fairly rapidly when on max AC setting (5-10 seconds on, then 5-10 seconds off). Hooked up gauge to low pressure side and the readings were 60psi WITH compressor on, then fell to 30psi when the compressor turns off. Any suggestions on where to start? Haven't done too many AC fixes before, so any ideas would help. Potentially a bad compressor? Overcharged lines? Thanks in advance guys
Jared
More Turbo
Joined: Jun 2014
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From: Asheboro, NC
Hotshot
Joined: Jan 2004
Posts: 19,768
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From: St Louis
bad thermistor? https://www.ford-trucks.com/forums/1...-solution.html
Cargo Master
Joined: Sep 2012
Posts: 3,061
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From: Laramie, WY
You need to know how high the high side pressure is. Once the high pressure goes through an orifice it expands and consumes the heat creating the cool air. And as pointed out earlier, a short cycling compressor usually means the pressure is low.
More Turbo
Joined: Jun 2014
Posts: 719
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From: Asheboro, NC
Is it? That's what the thermistor does- cycle the compressor. If it or the plug or wiring is a little wonky it would provide exactly what is happening. It's worth $2.85 or whatever at Radio Shack to jump it out and see what happens isn't it?
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Yes, it is different. This thread is for a short-cycling compressor. The other one is for a system that described as "mediocre" due to a software limitation on the evaporator core temperature and describes a way to fool the computer.
If you should happen to understand HOW the system works, you can discern what the difference is. Note that this one works okay in the cool mornings but fails completely during the heat of the day. These are classic symptoms of a severely undercharged system.
No, it doesn't. The thermistor REPORTS the evaporator temperature to the computer when then, based on its programming, makes the decision on how to control the clutch. There is a profound difference that must be understood.
If you want to go to Radio Shack and try a resistor in YOUR truck, go ahead. You'd better hurry, though, most of them will be gone VERY shortly, like 1-3 weeks. They just filed for BK and almost all of them except a couple hundred nationwide will be closing by early April.
If you should happen to understand HOW the system works, you can discern what the difference is. Note that this one works okay in the cool mornings but fails completely during the heat of the day. These are classic symptoms of a severely undercharged system.
That's what the thermistor does- cycle the compressor.
If you want to go to Radio Shack and try a resistor in YOUR truck, go ahead. You'd better hurry, though, most of them will be gone VERY shortly, like 1-3 weeks. They just filed for BK and almost all of them except a couple hundred nationwide will be closing by early April.
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Cross-Country
Joined: Nov 2014
Posts: 80
Likes: 15
I think low Freon also. He needs a friend or someone with a set of gauges and a few cans of Freon to help him out. I would only add refrigerant if I could watch the high side at the time to make sure all is working ok. (a manifold with gauges hooked up)
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