Search found 163 matches

by GM Tech
Fri Jul 01, 2016 5:21 am
Forum: Automotive Air Conditioning Forum
Topic: 2001 Tahoe cold AC while driving, warm when idle
Replies: 4
Views: 3306

Re: 2001 Tahoe cold AC while driving, warm when idle

Suction pressure at 80 psi while at idle is why there is little cooling-should be near 35-40psi, topping off is not the way to fix any a/c system. You must put in the system exactly what the under hood label specifies. If OT was plugged, discharge pressure would go sky high. So with that in mind, yo...
by GM Tech
Thu Jun 30, 2016 12:43 pm
Forum: Automotive Air Conditioning Forum
Topic: 200 GMC Sonoma - Comp runs but no cooling
Replies: 12
Views: 7386

Re: 200 GMC Sonoma - Comp runs but no cooling

Compressor is variable, orifice tube is fixed....not a TXV system.
by GM Tech
Thu Jun 30, 2016 12:42 pm
Forum: Automotive Air Conditioning Forum
Topic: Replace GM High Side Service Port with Schrader?
Replies: 9
Views: 6026

Re: Replace GM High Side Service Port with Schrader?

A good cap with rubber washer inside will seal it--they all leak, this is how I test my sniffer- take a cap off to test it....I was like you - did not believe it until I tried it and talked to the lines and hoses engineers at GM- they designed the caps to seal as the primary seal- they tell me the v...
by GM Tech
Wed Jun 29, 2016 7:22 pm
Forum: Automotive Air Conditioning Forum
Topic: 200 GMC Sonoma - Comp runs but no cooling
Replies: 12
Views: 7386

Re: 200 GMC Sonoma - Comp runs but no cooling

By reporting the pressures high and low........as the compressor is running.
by GM Tech
Wed Jun 29, 2016 11:23 am
Forum: Automotive Air Conditioning Forum
Topic: Pressure setting for HPCO?
Replies: 2
Views: 2163

Re: Pressure setting for HPCO?

HPCO normally closed switches open typically at 405-425 psi, high pressure relief valves blow at 525 psi....
by GM Tech
Wed Jun 29, 2016 4:48 am
Forum: Automotive Air Conditioning Forum
Topic: 200 GMC Sonoma - Comp runs but no cooling
Replies: 12
Views: 7386

Re: 200 GMC Sonoma - Comp runs but no cooling

You will know nothing until you determine the amount of refrigerant in the system. The only way to do this is to extract the refrigerant and weigh it and compare to the amount listed on the under hood sticker. You have a 65% chance of being low on refrigerant due to a leak according to my 3200 GM ca...
by GM Tech
Tue Jun 28, 2016 4:46 am
Forum: Automotive Air Conditioning Forum
Topic: AC in 98 Cavilier wont blow out cold air
Replies: 5
Views: 3557

Re: AC in 98 Cavilier wont blow out cold air

What's a regulator?? Anyway- it takes 47 psi static pressure to engage compressor- as read by the pressure transducer on the high side line near the upsidedown high side port- you can always jumper the a/c relay socket to test compressor function...located in the relay center underhood.
by GM Tech
Sat Jun 25, 2016 5:15 am
Forum: Automotive Air Conditioning Forum
Topic: Running A6 without oil
Replies: 3
Views: 2575

Re: Running A6 without oil

A-6s have an oil sump and pump guilt in- do you think there was any oil in it? You can pull drain plug to see. As long as it still turns, there is hope- they typically have a thermal fuse that will blow and shut them off if body gets too warm--- did body get too hot to touch? They are pretty tough- ...
by GM Tech
Thu Jun 23, 2016 6:15 am
Forum: Automotive Air Conditioning Forum
Topic: Need AC advice for 2000 Silverado
Replies: 11
Views: 6372

Re: Need AC advice for 2000 Silverado

Whoa Nelly!!! Your first clue is your static pressure!!!! Low Side 35.5 to 40.0 (116 in Hg) High Side 35.5, 8 Bar, (115 in Hg) You should read at least 80-90 psi at 80-90 degree ambient!!! and nearly 110 psi at 107 degree ambient- (it runs real close to temp variation) 35 is wayyyy to low- unless it...
by GM Tech
Tue Jun 21, 2016 7:14 pm
Forum: Automotive Air Conditioning Forum
Topic: Odd restriction problem...need another perspective
Replies: 2
Views: 2230

Re: Odd restriction problem...need another perspective

How's your airflow inside the car from the vents? A 93 H-car was notorious for evaporator leaks where the oil leached out onto the air inlet face of evap and then dirt and debris would plug up the air flow path, causing huge inefficiencies, as well as a loss of refrigerant. I personally changed doze...

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