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05 Freestar A/C high pressure cuts on and off
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comnavguy
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Aug 23, 2012, 7:44 PM
Post #1 of 7
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05 Freestar A/C high pressure cuts on and off
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2005 Ford Freestar, 3.9 V6 with 153,000 miles A/C is cooling at regular driving speeds but at idle, the high side pressure climbs fairly rapidly to over 400 psi and cuts off and then repeats.
The condenser fan does not come on, but I sprayed water on the condenser to see if that helped, but it didn't.
The compressor is making lots of noise. When the owner first described the problem, I thought overcharged system, but the system has not been "topped off" since it was serviced 2 years ago by the dealer service dept.
I injected about 1 oz of PAG 46 but it the death rattle was as bad as ever. Is there anything other than a cratering compressor that would cause these symptoms?
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Discretesignals
Ultimate Carjunky
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Aug 23, 2012, 8:57 PM
Post #2 of 7
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Re: 05 Freestar A/C high pressure cuts on and off
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I'd pump it down and see how much is in it. If your using a refrigerant analyzer, that would help to tell you if you have air or contamination. Did you figure out why the fans aren't coming on?
If there is air in the system or overcharge that can cause high pressure if your dosing the condenser down with water. It might be too late for the compressor if it has been seeing those high pressures for a period of time. Don't know if you can get to the orifice on it, but might want to check for debris in the orifice when you have it pumped down. Debris can plug up the condenser tubes and cause high high side pressures also.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Tom Greenleaf
Ultimate Carjunky
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Aug 24, 2012, 12:42 AM
Post #3 of 7
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Re: 05 Freestar A/C high pressure cuts on and off
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Noise in that compressor whatever the original failure doesn't sound good for it and the debris is now probably the problem. Yes - as DS just said contaminated refrigerant, over and under charged or destructive air (has water in air that wrecks things) is probably now the issue so just a compressor wont be the end all. I can't see that a noisy compressor can survive that for long and they don't heal,
T
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Discretesignals
Ultimate Carjunky
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Aug 24, 2012, 4:46 AM
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Re: 05 Freestar A/C high pressure cuts on and off
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I was thinking that too at first, but then he stated he hit the condenser with water and there was no change. Even though the fan isn't working, hitting it with water should have brought the pressures down fast. That's unless he didn't hit the condenser with enough water and/or wasn't hitting it with water while watching pressures. I do agree that the fan problem needs to be solved.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Aug 24, 2012, 4:49 AM)
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Hammer Time
Ultimate Carjunky
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Aug 24, 2012, 4:52 AM
Post #6 of 7
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Re: 05 Freestar A/C high pressure cuts on and off
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Yeah, but we don't know how much water or how much of the condenser was saturated. Don't try to diagnose a system with no fan.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 24, 2012, 6:15 AM
Post #7 of 7
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Re: 05 Freestar A/C high pressure cuts on and off
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Ya - hard to know how effective water was if fan wasn't pulling it in. I would have guessed at 400H compressor would quit and probably fan as well but said it makes noise so must be engaging. If that death knock it may need an autopsy,
T
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