Search found 98 matches

by GM Tech
Thu Mar 23, 2017 5:30 am
Forum: Automotive Air Conditioning Forum
Topic: 07 Chevy HHR Low Side Service Port
Replies: 3
Views: 42

Re: 07 Chevy HHR Low Side Service Port

Does it show the leak with the cap on? To test my leak detector- I take the cap off.
by GM Tech
Sun Mar 19, 2017 2:22 pm
Forum: Automotive Air Conditioning Forum
Topic: Ford F-250 A/C blows cold then hot
Replies: 3
Views: 36

Re: Ford F-250 A/C blows cold then hot

Is compressor nose (front end) turning when it starts blowing hot?
by GM Tech
Sun Mar 05, 2017 9:15 am
Forum: Automotive Air Conditioning Forum
Topic: Stumped - incessant cycling and pressures all out of whack (video included)
Replies: 2
Views: 120

Re: Stumped - incessant cycling and pressures all out of whack (video included)

Keep in mind, that a a/c system with a variable stroke compressor that cycles frequently is because of of high pressure cut-outs- most likely- high head pressure is usually due to lack of air flow through condenser, or blocked condenser, --so do your cooling fans work? - your head pressure you see o...
by GM Tech
Wed Dec 07, 2016 6:40 am
Forum: Automotive Air Conditioning Forum
Topic: Lack of pag oil in compressor
Replies: 8
Views: 480

Re: Lack of pag oil in compressor

On V-7 variable displacement compressors as is yours- oil should be drained/added through the oil drain bolt/plug on the side of the compressor. There are three pressure zones, suction, discharge, and crankcase- there is at any given time a reservoir of 3 fl ozs in the crankcase. Your new compressor...
by GM Tech
Wed Oct 12, 2016 5:54 pm
Forum: Automotive Air Conditioning Forum
Topic: 2011 Ram Compressor not kicking on
Replies: 9
Views: 721

Re: 2011 Ram Compressor not kicking on

you have about 5% of needed refrigerant in your system--- find your leak..fcix it, evacuate and recharge to factory spec compressor will come on when you put in the right amount of refrigerant.
by GM Tech
Sun Oct 02, 2016 5:51 am
Forum: Automotive Air Conditioning Forum
Topic: A/C Cycles on and off
Replies: 4
Views: 1226

Re: A/C Cycles on and off

That indeed is one of the symptoms of low refrigerant - you have a leak and are probably at about 15% refrigerant left in the system- best way to check is to have refrigerant extracted and weighed to know how much you have lost-- would just keep refilling a tire that goes flat once a week?
by GM Tech
Tue Sep 20, 2016 3:15 pm
Forum: Automotive Air Conditioning Forum
Topic: low side low, high side high, compressor cycling
Replies: 2
Views: 414

Re: low side low, high side high, compressor cycling

Put the factory specified amount in it- then test....too many variables if you don't know how much refrigerant is in there...If you extract and weigh charge- you'll know if you have a leak-- then look for oil and dye evidence-- or have a sniffer ran over it..
by GM Tech
Mon Sep 19, 2016 5:11 pm
Forum: Automotive Air Conditioning Forum
Topic: 1989 F150 A/C freezing at Orifice tube
Replies: 5
Views: 656

Re: 1989 F150 A/C freezing at Orifice tube

You answered your own question-- you said it never cycles- and compressor stays on even with no charge-- so that is what is wrong--make your cycling switch work so IT WILL AVOID FREEZE UP. as designed. If pump runs with no refrigerant in it- someone somewhere has bypassed the cycling switch - so fin...
by GM Tech
Sat Sep 17, 2016 2:03 pm
Forum: Automotive Air Conditioning Forum
Topic: Adding electric fans to antique car
Replies: 3
Views: 499

Re: Adding electric fans to antique car

Wiring when a/c is on is okay- but use the a/c command from control head, not the compressor command- compressor can shut off for high pressure- and that is when you need the fan the most....Also be sure and use a relay in the circuit, you don't want to pull those big amps through a control head...I...
by GM Tech
Fri Sep 16, 2016 5:13 am
Forum: Automotive Air Conditioning Forum
Topic: Help with variable displacement dual evap system!
Replies: 6
Views: 592

Re: Help with variable displacement dual evap system!

If control valve has a wire to it- then it is a pulse width modulated control valve. meaning the a/c controller "shoots" 12v at it to adjust it- much like a servo motor- so in some cases , there is no magnetic clutch (2012 chevy cruze for example) and the a/c relay is in the circuit to the...

Go to advanced search