Search found 172 matches

by GM Tech
Thu Aug 17, 2017 4:24 am
Forum: Automotive Air Conditioning Forum
Topic: ac gasket vs oring
Replies: 1
Views: 2450

Re: ac gasket vs oring

If it is a manifold- NO o-rings- use sealing washers- not metal gaskets...If o-ring connector- there will be o-ring grooves!
by GM Tech
Tue Aug 15, 2017 7:39 pm
Forum: Automotive Air Conditioning Forum
Topic: R12 Charging Problem
Replies: 3
Views: 4034

Re: R12 Charging Problem

You don't "jump" the switch, you jump the connector to the switch....If a/c compressor does not come on when doing this, then you have another issue- such as a relay, or high pressure switch unplugged, or a power steering switch unplugged- get a wiring diagram of your a/c circuit and do th...
by GM Tech
Tue Jul 25, 2017 4:22 am
Forum: Automotive Air Conditioning Forum
Topic: Evaporator Temp Sensor
Replies: 1
Views: 2474

Re: Evaporator Temp Sensor

I'd be more afraid of high pressure- when you jumper the relay, you have no control- if head pressure should rise to over 400 psi- the system cannot shut off compressor and you chance blowing out the high pressure relief valve- if really hot out- there needs to be an electrical cut-out which you wil...
by GM Tech
Tue Jul 18, 2017 7:15 pm
Forum: Automotive Air Conditioning Forum
Topic: High Pressure issue R4 Compressor Chevrolet Tahoe
Replies: 11
Views: 9207

Re: High Pressure issue R4 Compressor Chevrolet Tahoe

ditto on the fan issue- you MUST have fans on immediately when a/c is on.....case closed.
by GM Tech
Thu Jul 13, 2017 4:24 am
Forum: Automotive Air Conditioning Forum
Topic: Question: High side port....
Replies: 8
Views: 6468

Re: Question: High side port....

Yes, you can buy the port with ball valve assembly inside- there is a tool for easy removal, but a pair of vice grips works just fine- be sure the port valve assembly casing that screws onto the line is threaded okay and tight- Three times in my life, I have attempted to remove a cap by unscrewing i...
by GM Tech
Mon Jul 10, 2017 10:29 am
Forum: Automotive Air Conditioning Forum
Topic: 01 f250 high low side and high side pressures
Replies: 9
Views: 6944

Re: 01 f250 high low side and high side pressures

Put a virgin 30 lb tank upsidedown and attach to compressor hose port with adapter- and let it fill- recover with your machine out the suction port with adapter- if your machine can recover, it can flush.
by GM Tech
Mon Jul 10, 2017 10:27 am
Forum: Automotive Air Conditioning Forum
Topic: Drawing Down a Vacuum
Replies: 3
Views: 3597

Re: Drawing Down a Vacuum

Pull a vacuum and hold test on gage set first (not attached to car) to make sure it is not leaking
by GM Tech
Sun Jul 09, 2017 5:56 pm
Forum: Automotive Air Conditioning Forum
Topic: 01 f250 high low side and high side pressures
Replies: 9
Views: 6944

Re: 01 f250 high low side and high side pressures

If your machine is a recovery machine, it can do flushes. Simply fill at compressor discharge port connection and recover from suction connection-then reverse the flow- with appropriate flushing adapters- very simple- remove any expansion devices first, and if a TXV system- use a "dummy" t...
by GM Tech
Sun Jul 09, 2017 4:45 am
Forum: Automotive Air Conditioning Forum
Topic: 01 f250 high low side and high side pressures
Replies: 9
Views: 6944

Re: 01 f250 high low side and high side pressures

Most likely- you probably washed it out with the remaining flush that could not be "blown out" of the system. Never put any degreasers in a system that you can't get it all out!. Seen this numerous times- I only flush with refrigerant, that way it all comes out, and if some was to be left ...
by GM Tech
Fri Jul 07, 2017 6:43 pm
Forum: Automotive Air Conditioning Forum
Topic: 2000 Dodge Dakota with intermittent A/C issue
Replies: 4
Views: 4138

Re: 2000 Dodge Dakota with intermittent A/C issue

ditto on air gap scenario- does clutch turn when a/c goes inop?

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