Search found 144 matches

by GM Tech
Fri Oct 13, 2017 2:21 am
Forum: Automotive Air Conditioning Forum
Topic: weird Intermittent problem
Replies: 2
Views: 87

Re: weird Intermittent problem

Air comes out vents (only) when accelerating? Do you have vacuum controls for air doors in HVAC box? or electric controls? Yr make and model of car would give us more hints
by GM Tech
Wed Sep 27, 2017 1:26 am
Forum: Automotive Air Conditioning Forum
Topic: Micron gauge
Replies: 2
Views: 172

Re: Micron gauge

Tee it into your vacuum pump- anything below 500 microns is excellent--but it all depends on your vacuum pump's ability to pull a good vacuum- you can always deadhead the micron gauge directly into the vacuum pump to test the pump only- and its ability to pull a good vacuum- some vacuum pumps are wo...
by GM Tech
Mon Sep 25, 2017 11:23 pm
Forum: Automotive Air Conditioning Forum
Topic: Why aren't V7s used everywhere?
Replies: 7
Views: 269

Re: Why aren't V7s used everywhere?

V-7s and V-5 need to be mounted with control valve at 6 o'clock or near that-- 5 to 7 o'clock will work-- it is for oil splash inside the crankcase. A V-5 will do as good as the V-7 in my opinion. I have seen too many V-7s run low on charge and burn up inside on the S truck application-- I usually r...
by GM Tech
Wed Sep 06, 2017 2:42 pm
Forum: Automotive Air Conditioning Forum
Topic: 1997 Suburban
Replies: 2
Views: 285

Re: 1997 Suburban

Your OEM accumulator has the oil part number on the label- google it and see specifications. The oil won't go in the discharge hole of the compressor (the small one) there is not enough room in that cavity-- but it will all go in the suction port- the larger port (and pipe) there should be an "...
by GM Tech
Sun Sep 03, 2017 4:46 am
Forum: Automotive Air Conditioning Forum
Topic: High side line temp from comp thru condensor and up to h block
Replies: 5
Views: 399

Re: High side line temp from comp thru condensor and up to h block

If the condenser s doing its job the temp should drop from inlet to outlet-- thus "condensing" occurs-- that is why it is set up to have air blown across it- to cool the refrigerant inside that allows it to change state- from a gas to liquid....if there were no cooling- there would be hot ...
by GM Tech
Fri Sep 01, 2017 4:26 pm
Forum: Automotive Air Conditioning Forum
Topic: Gaskets are wrong?
Replies: 1
Views: 263

Re: Gaskets are wrong?

A new service compressor uses 134a port configuration- which needs to be adapted back to r-12 hose manifold as is yours...so you use the sealing washers in your kit- never use the aluminum port locators-(metal stubs you called them) (sleeves) in the kit- I have been doing a/c for 25 yrs and have nev...
by GM Tech
Thu Aug 31, 2017 6:48 pm
Forum: Automotive Air Conditioning Forum
Topic: 1994 Chevy 1500 AC clutch clicking on and off
Replies: 9
Views: 500

Re: 1994 Chevy 1500 AC clutch clicking on and off

I hope you pull adequate vacuum first--and you always charge by weight- not pressures in automotive a/c....so don't ask for pressure specs- there are none...just opinions
by GM Tech
Wed Aug 30, 2017 6:38 pm
Forum: Automotive Air Conditioning Forum
Topic: 1994 Chevy 1500 AC clutch clicking on and off
Replies: 9
Views: 500

Re: 1994 Chevy 1500 AC clutch clicking on and off

One can is 12 ounces- your truck holds 2 lb or 32 ounces- so you need almost 3 cans. You have trouble getting the first can all in because it is almost empty- put another can on, then another and be happy. The compressor will suck refrigerant in and stop cycling so rapidly when you get enough "...
by GM Tech
Mon Aug 28, 2017 7:56 pm
Forum: Automotive Air Conditioning Forum
Topic: 98 Buick Park Avenue, AC low pressure too high
Replies: 4
Views: 367

Re: 98 Buick Park Avenue, AC low pressure too high

There is NO low pressure switch on your 1998 vehicle!!!! Low pressure switches stopped on "C/H" cars in 1996! which used an HD-6 compressor. 1996+ MY "C/H" cars utilizes a V-5 variable stroke compressor- that averts evaporator freeze-up by destroking the displacement. You have a ...
by GM Tech
Thu Aug 24, 2017 6:38 pm
Forum: Automotive Air Conditioning Forum
Topic: GM R4 Compressor - New Scroll Design. Better than Piston Type ?
Replies: 26
Views: 1137

Re: GM R4 Compressor - New Scroll Design. Better than Piston Type ?

Every scroll I have run or seen on current vehicles have a need for speed- every one of their owners complain of no cooling at idle. Suction pressure is in the 60s at idle- will drop to 30s at 3500 erpm.

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