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a/c compressor won't stay engaged
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volksrod
New User
Aug 13, 2011, 10:03 AM
Post #1 of 7
(16429 views)
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a/c compressor won't stay engaged
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Hi there, another newbie asking silly questions but here goes anyway. Have a 2005 Pontiac Montana 6 cyclinder with 180K for mileage. A/C was weak( not cooling well), recharged system to low side pressure of 36 lb. When car was restarted the compressor would not stay engaged and no cool air coming out at all now. The equipment I have does not give me a high side pressure so I,m SOL there. If you have any ideas with the limited info I have given please let me know. I am thinking that a professional a/c shop may be in my future. Anyway thanks for your help. dave
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 13, 2011, 10:10 AM
Post #2 of 7
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Re: a/c compressor won't stay engaged
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Your probably right that the ac shop is the future. Without knowing both high and low side pressures it is difficult to even guess what is going on.
Another problem is that the system holds a certain weight of refrigerant. Too much or too little can cause poor ac performance and/or system damage. Charging a system by pressure instead of weight is an extremely inaccurate way of making sure you have the correct weight of refrigerant in the system. The system has to be recovered, vacuum, and recharged with the proper weight. Then reading system pressures can give you idea what is going on if the problem is still there.
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
/ Moderator
Aug 13, 2011, 12:16 PM
Post #3 of 7
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Re: a/c compressor won't stay engaged
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As Discretesignals just said this needs to be charged by weight to knowns of system capacity which I can or we can provide but like he just said this needs a shop that does this as it's difficult and equipment can get insanely expensive for the DIYer. Yes, some rent able but doubt you are there yet and no harm intended.
I don't want to lock another post up top but do read "CHARGING PROCEDURES" that's there now. OMG, that's just the tip of the iceberg in a fixed or working system and pages long!
1. Doing this wrong can not only hurt you but wreck mega bucks of components so beware or let the pros do it as there's too much at risk, not just an opinion but the truth.
1. (again) Too much or too little refrigerant won't cool properly. Way too much is damage you don't want.
This may need a repair or just proper charge and can't know that without more info,
Tom
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volksrod
New User
Aug 13, 2011, 2:36 PM
Post #4 of 7
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Re: a/c compressor won't stay engaged
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thanks to you for your reply Will hit the pros on Monday 
regards dave
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volksrod
New User
Aug 13, 2011, 2:39 PM
Post #5 of 7
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Re: a/c compressor won't stay engaged
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Don't you just hate when you can't do it yourself guess the a/c will work if I take it to the pros regards dave
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 13, 2011, 3:32 PM
Post #6 of 7
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Re: a/c compressor won't stay engaged
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I hate not being able to do things myself also, but if I don't have the equipment, skills, or training it's really hard to do something right the first time. When it comes to things like tiling the bathroom or installing a range hood, I'm gonna make a mistake. 
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 13, 2011, 3:34 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 13, 2011, 9:50 PM
Post #7 of 7
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Re: a/c compressor won't stay engaged
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Right with you DS. Several things I won't do on the home front. ONE - some things need legal work whether I could do it or not and signed off and new codes like your range hood that POed me as last one required X number on inches over stove to be a dual hood and microwave and would have been a nightmare. Eliminate cabinets or a no go!
Roofing - forget it. Had it done as I can't carry those bundles and chew gum anyway never mind walk around with them on a steep roof.
220 wiring. NOT. Both legal issues and a mistake could burn my home down - sometimes wish it would - not real funny.
Opposite: Car stuff I was trained 5 years worth and have no issues with. A/C as cars got newer are VERY sensitive to the correct amounts vs some old (I mean 60s+70s) where a whole pound off still worked fine, no more.
There are places to save money and places smarter to get the right help for sure,
Tom
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