ac help please!
Thread Starter
7th Gear
Joined: Jul 2013
Posts: 7
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ac help please!
Hi guys i am workin on a 2000 vette with no ac. I have no power to the motor i was trying to check the pressure switch for continuity but could figure out which of the 3 prongs i should be reading. Can i just jimp the pressure switch if the compressor is unplugged to see if theat will give me power? Any help would be very apreciated
Thread Starter
7th Gear
Joined: Jul 2013
Posts: 7
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Srry motor was a typo i meant compressor. The ac light comes on in the car then goes off the compressor clutch never goes. The system before this was recharged by a shop that managed to not notice the belt off the compressor so thats how it came to me. I put a belt on it then replaced the tensioner also. I dont know why the belt was off. I tried the ac and the clutch will not turn on checked for power at the clutch no power i was told the next step to diagnose the issue was to check the pressure switch
Drifting
Joined: Sep 2009
Posts: 1,719
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From: cinnaminson n.j.
St. Jude Donor '14
get a set of ac gauges on it. The freon may have leaked out. You should have a static pressure close to ambient temp. If so you need to check and see if you have power and ground to the clutch. Can you turn the clutch by hand (engine off)?
Tech Contributor
Joined: May 2008
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
There's absolutely no way that any shop could do a proper refrigerant charge with the belt being off of the compressor!
It sounds to me like you have a low refrigerant charge, which is why the compressor doesn't run. I would recommend a complete system evacuation with a vacuum pump, and see if holds a vacuum before going any further. Running it with a jumped out pressure switch can do damage to the compressor, since the refrigerant also carries oil through the compressor for lubrication to it's internal moving parts.
If it doesn't hold a vacuum, locate and repair the leak before recharging with the correct amount of R-134A refrigerant and PAG oil.
It sounds to me like you have a low refrigerant charge, which is why the compressor doesn't run. I would recommend a complete system evacuation with a vacuum pump, and see if holds a vacuum before going any further. Running it with a jumped out pressure switch can do damage to the compressor, since the refrigerant also carries oil through the compressor for lubrication to it's internal moving parts.
If it doesn't hold a vacuum, locate and repair the leak before recharging with the correct amount of R-134A refrigerant and PAG oil.
Tech Contributor
Joined: May 2008
Posts: 3,100
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Static Pressure= Pressure of the refrigerant in the system (compressor not running) at ambient temperature.
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Tech Contributor
Joined: May 2008
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Le Mans Master
Joined: Sep 2003
Posts: 8,847
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From: Longview Texas
That's right. If both gauges read zero pressure with AC compressor off, then there is no freon pressure in the system.
Both gauges should read over 100 psi without the compressor running.
When the compressor is working, the low side pressure drops, and the high side pressure increases.
Both gauges should read over 100 psi without the compressor running.
When the compressor is working, the low side pressure drops, and the high side pressure increases.
Last edited by TEXHAWK0; Jul 13, 2013 at 06:35 PM.
Tech Contributor
Joined: May 2008
Posts: 3,100
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
There's absolutely no way that any shop could do a proper refrigerant charge with the belt being off of the compressor!
It sounds to me like you have a low refrigerant charge, which is why the compressor doesn't run. I would recommend a complete system evacuation with a vacuum pump, and see if holds a vacuum before going any further. Running it with a jumped out pressure switch can do damage to the compressor, since the refrigerant also carries oil through the compressor for lubrication to it's internal moving parts.
If it doesn't hold a vacuum, locate and repair the leak before recharging with the correct amount of R-134A refrigerant and PAG oil.
It sounds to me like you have a low refrigerant charge, which is why the compressor doesn't run. I would recommend a complete system evacuation with a vacuum pump, and see if holds a vacuum before going any further. Running it with a jumped out pressure switch can do damage to the compressor, since the refrigerant also carries oil through the compressor for lubrication to it's internal moving parts.
If it doesn't hold a vacuum, locate and repair the leak before recharging with the correct amount of R-134A refrigerant and PAG oil.
Actually you can. I just did it last weekend. the ac recycle/recharge machines have heaters to warm up the r134 tank. After I evacuated and vac tested mine, I set it to charge while i was working on another car. About ten minutes later, I went to start my engine and ac and it was already done charging. Not trying to bust *****. I agree with you 100% about his compressor not running because of low charge.
Racer
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From: edinburg VA.