Search found 196 matches

by GM Tech
Tue Aug 16, 2022 11:42 pm
Forum: Automotive Air Conditioning Forum
Topic: First AC Job
Replies: 9
Views: 5969

Re: First AC Job

May have an a/c code set---unhook battery for 10 sec and see what happens
by GM Tech
Mon Aug 15, 2022 8:31 pm
Forum: Automotive Air Conditioning Forum
Topic: My R4 compressor never cycles, either
Replies: 4
Views: 3645

Re: My R4 compressor never cycles, either

Adjustable cycling switches haven't been used for over 30 years---Everything used on GM vehicles are non-adjustable--(no screw between terminals). Cycling switches are there to avert freeze-up and low refrigerant charge (pressure) ruining your compressor. If it is not cycling- it's most likely the ...
by GM Tech
Sun Aug 07, 2022 12:36 am
Forum: Automotive Air Conditioning Forum
Topic: 2000 Silverado Hi side port leaking
Replies: 18
Views: 13064

Re: Seized Hi pressure Port

I use vice grips to grip up high- who cares if the sealing area gets marred- I'm replacing that part....
by GM Tech
Wed May 18, 2022 11:45 pm
Forum: Automotive Air Conditioning Forum
Topic: 1995 Buick Skylark evap leak?
Replies: 2
Views: 2994

Re: 1995 Buick Skylark evap leak?

'95 "N" car evaps aren't too bad- I've done a dozen or so. The drain pan comes down, the heater core is removed and the evap comes out, there are about 13 5.5mm screws (brass-colored) that need to be removed- most mechanics only put about 8 of them back in- thats how I tell if evap has been replaced ...
by GM Tech
Wed May 18, 2022 11:30 pm
Forum: Automotive Air Conditioning Forum
Topic: 78 Trans Am R12 System Rebuild, High Port Adaptor
Replies: 10
Views: 8989

Re: 78 Trans Am R12 System Rebuild, High Port Adaptor

The reason they say don't use high side is so you don't try to charge through it with pump running....Duh. they are playing it safe.

Those threads on the port you want to use are easily recognized as metric 134a threads- the same that are on a 30 lb tank of 134a refigerant. So your new muffler is ...
by GM Tech
Sun Mar 20, 2022 3:13 am
Forum: Automotive Air Conditioning Forum
Topic: 99 suburban dual air issues
Replies: 6
Views: 13574

Re: 99 suburban dual air issues

Most common issue when replacing multiple parts on a dual system suburban is that the OEM orifice tube is on liquid line from condenser out to right in front of "Y" to rear system. Here is where the problem occurs-- Most all new condenser purchased will have a brand new orifice tube in the line out ...
by GM Tech
Sun Mar 13, 2022 1:10 am
Forum: Automotive Air Conditioning Forum
Topic: 96 Chevy Silverado A/C Line Torque/Tightening
Replies: 2
Views: 2624

Re: 96 Chevy Silverado A/C Line Torque/Tightening

Use Mechanic"s torque...Experience and knowing not to overtighten to avoid strip outs...
by GM Tech
Tue Oct 05, 2021 1:41 am
Forum: Automotive Air Conditioning Forum
Topic: 2007 Yukon Denali – no air flow – freezing but not low on charge?
Replies: 23
Views: 22026

Re: 2007 Yukon Denali – no air flow – freezing but not low on charge?

Low side pressure switch on your accumulator is bad-- it should cycle off the compressor at about 22 psi and back on at about 28 psi or so. I am concerned of lack of oil return when you run below 10-15 psi. I used to test continuous run (stuck shut cycling switches) compressors- and the front ...
by GM Tech
Sun Jun 27, 2021 9:15 pm
Forum: Automotive Air Conditioning Forum
Topic: 02 Silverado ac compressor problem
Replies: 6
Views: 6502

Re: 02 Silverado ac compressor problem

I agree- next time "clutch stops working" get out of the truck and find a way to bump the front hub (clutch) of the compressor- chances are really good it will snap in and start working. This is a sure sign of a "too wide air gap"- Fix it by removing the clutch, and removing the thickest shim in ...