Bad AC compressor or something else?
Thread Starter
|
New User
Joined: Mar 2017
Posts: 1
Likes: 0
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
Posts: 716
Likes: 92
From: Asheboro, NC
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
bad thermistor? https://www.ford-trucks.com/forums/1...-solution.html
Cargo Master
Joined: Sep 2012
Posts: 3,061
Likes: 39
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: 716
Likes: 92
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: 19,760
Likes: 1,079
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.
Trending Topics
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)
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Bad Company
1999 - 2003 7.3L Power Stroke Diesel
11
Mar 28, 2005 11:36 PM