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#1
08-25-2004, 02:29 PM
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air conditioner
Hi, I'm new to this site...
I'm having problems with my air conditioner...It will work for awhile, but then it will cut out and just blows warm air. I will shut it off, along with the fan, the a minute later turn them both on..and the air will be working for a while...then cut out again. I own a 1995 GMC Sierra 1500. If anyone can help, I'd appreciate it much. 
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#2
08-25-2004, 08:45 PM
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Thats a tough one.... are you driving when it blows warm or are you parked?
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#4
08-26-2004, 10:37 AM
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Re: air conditioner
Quote:
I have a 95 GMC Sierra and my air conditioner was blowing warm air, but all I did was recharge the freon. It works fine now.
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#5
08-26-2004, 11:51 AM
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Sounds like your low pressure switch on the accumalator. You get get this at a local parts store for about $12. Replace the oil ring when you do this. If it blows cold then then just starts blowing warm, this should be it. A way to check this is: with the ac blowing warm air, disconnect the wire at the low pressure switch. Install a wire jumper across the two terminals. The compressor should kick in and the accumalator will suddenly get cold. If it does this, take the jumper out and change your switch.
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#6
08-30-2004, 04:48 PM
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GOOD CALL DEEPEE!
I have 3 certs in auto a/c and I missed that one. That is definatly the first place to start seeing as how it blows cold, then warm, then cold again. I was actually suspecting a slight clog in the orifice or accumulator, but I have a bad habit of over analizing things and overlooking the easy obvious stuff.
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#8
08-31-2004, 01:58 PM
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Re: air conditioner
The low pressure switches on those model will cause some intermittant problems..when the AC is turned on and not blowing cold, check to see if the compressor is engaged...if not, tap on the LP switch..if the compressor engages then the switch is your problem
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#9
09-01-2004, 10:29 AM
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Re: air conditioner
I see alot of folks are viewing this post. If you suspect a faulty low-pressure switch, than by-passing the switch will not test the switch unless you know your system pressure readings. If you by-pass the switch the compressor clutch will engage regardless of the condition of the switch. Follow GMMerlin's advice to test the switch if pressure readings are not available. P.S. I still think Cat44 is just a little low on refrigerant, but then I've been wrong before.
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#10
09-01-2004, 12:07 PM
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Well...... the same thing happened to mine last summer, doing the same as CAT44's. It would blow cold then warm, then later on, cold again. I went through the instructions in my previous post. Replaced the switch and never had a problem since then.
Gooseneck: If you were low on freon, how could it blow cold air, then warm, then cold again? Seems like if you were low on freon, it couldn't blow cold at all? CAT44: What did you find out?
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#11
09-01-2004, 12:59 PM
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Re: air conditioner
Hi DEEPEE, I'm not saying that it's not the switch, it very well could be. My hunch is just based on the fact that leaks are much more common than intermittent switch failures. Just a guess thats all. One thing I would bet money on though, CAT44's problem is one or the other so either way he should benifit from this discussion.
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#12
09-01-2004, 04:37 PM
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Re: air conditioner
Without the benefit of a set of A/C gauges to determine if there is any refridgerant in the system and years of experiance with these trucks, failure of the low pressure switch is more common than leaks on this system.
That being said, a truck that is 10 years old may have leaked enough over time not to engage the switch but with what the original poster stated about the air blowing cold then blowing hot, I would say this is a electrical problem (switch)and not a pressure problem (leak)
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#13
09-01-2004, 05:24 PM
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Re: air conditioner
An "Intermittent" switch (bad contacts in switch sometimes completing the circuit and sometimes not) and a borderline pressure in system sometimes throwing switch and sometimes not, would produce the same symptoms. Thats why I say it could be either-or. But I still stand by my hunch that Stacynb is right. Although I actually hope it is the switch, it will be a easy fix for Cat44 if it is.
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#15
09-22-2005, 11:21 AM
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Same prob. on my 97. Cold then warm. If I screw
around with controls, I can get it going cold again for a little while. I will check this switch before I look into recharging. I don't know exactly where this part is but I can probably research and find out. Thanks alot to all replies.
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