Search found 174 matches

by GM Tech
Thu Apr 01, 2021 11:18 pm
Forum: Automotive Air Conditioning Forum
Topic: Murray AC Compressor Questions
Replies: 2
Views: 156

Re: Murray AC Compressor Questions

HPRV otherwise known as High Pressure Relief Valve. It is a safety valve to release refrigerant if indeed the HPCO High Pressure Cut-Off switch does not shut off compressor.


Oil can be put in low side just fine---every compressor shipped to assembly plants has its belly full of all system oil..
by GM Tech
Fri Jan 22, 2021 4:21 am
Forum: Automotive Air Conditioning Forum
Topic: 1996 Cadillac Seville new AC question
Replies: 8
Views: 1262

Re: 1996 Cadillac Seville new AC question

Caddy's are a different animal-- Their algorithm detects loss of refrigerant by monitoring pressures AND inline temperatures before and after the orifice tube. So they know when you are losing charge and hence the very low refrigerant message-- Believe that message- it is doing its job-- Face it, yo...
by GM Tech
Sat Dec 12, 2020 11:26 am
Forum: Automotive Air Conditioning Forum
Topic: AC machine vacuum hose identification
Replies: 3
Views: 785

Re: AC machine vacuum hose identification

I've made my own before- just get rubber hose at auto parts store- right O.D. and slice off pieces- pretty easy and you'll have plenty of spares. They are called rubber seals or inserts.
by GM Tech
Wed Oct 28, 2020 12:03 pm
Forum: Automotive Air Conditioning Forum
Topic: 1995 lumina 3.1 vin m
Replies: 1
Views: 598

Re: 1995 lumina 3.1 vin m

If indeed this is a Olds "W" car sedan or perhaps a Chevy Lumina SUV "U-van" then the condenser fan "waits" until it sees 175psi pressure on the a/c high side outlet pipe to turn on the fan. Why run the fan if not needed? is the logic... Going down the road even on a ho...
by GM Tech
Mon Oct 26, 2020 9:47 pm
Forum: Automotive Air Conditioning Forum
Topic: Need a/c clutch coil removal help!
Replies: 3
Views: 1333

Re: Need a/c clutch coil removal help!

If there is no snap ring, then your coil is pressed fit onto the aluminum snout. Use two screwdrivers to pry it off with a rocking back and forth motion. To re-install use an arbor press, or tap it into place with a ball-peen hammer and punch.
by GM Tech
Sun Aug 16, 2020 1:46 am
Forum: Automotive Air Conditioning Forum
Topic: 2003Envoy XL Dual AC 4.2L Weak Cooling
Replies: 3
Views: 1390

Re: 2003Envoy XL Dual AC 4.2L Weak Cooling

65% of mobile a/c complaints are due to lack of cooling due to loss of refrigerant......put that in your pipe and smoke it!

This is from my 5200 car database....
by GM Tech
Sun Aug 16, 2020 1:43 am
Forum: Automotive Air Conditioning Forum
Topic: Oil Balance Question
Replies: 9
Views: 2345

Re: Oil Balance Question

If it makes you feel any better- just know that absolutely every automotive compressor built was installed in its vehicle home with the entire system charge amount of oil in its belly! So I'm not a big fan of oil distribution upon repairs. I worked for Delphi for 30 years and have been in every N. A...
by GM Tech
Sat Jul 18, 2020 2:04 am
Forum: Automotive Air Conditioning Forum
Topic: Jeep Liberty AC Compressor question
Replies: 10
Views: 3353

Re: Jeep Liberty AC Compressor question

It is not the engine warming that does it so much as the coil warming--the resistance has to increase and the windings get warm- both by engine heat and more so by electrical resistance...
by GM Tech
Tue Jul 14, 2020 10:37 am
Forum: Automotive Air Conditioning Forum
Topic: Help identifying an odd fitting
Replies: 3
Views: 1321

Re: Help identifying an odd fitting

Under that adapter is the original R-12 fitting--they only did the low side adapter--some folks are lazy....
by GM Tech
Tue Jul 14, 2020 10:34 am
Forum: Automotive Air Conditioning Forum
Topic: Jeep Liberty AC Compressor question
Replies: 10
Views: 3353

Re: Jeep Liberty AC Compressor question

This is a real common scenario- seen it numerous times. Clutch air gap has worn too wide such that the magnetic pull of the coil cannot pull in clutch driver after the coil warms- and electrical resistance increases. To prove this, next time it "should be running" tap on front of clutch wi...