Search found 27 matches

by 71403
Fri Jun 22, 2018 6:13 pm
Forum: Automotive Air Conditioning Forum
Topic: strange cooling
Replies: 4
Views: 56

Re: strange cooling

What are the pressures when it stops working?

Pusher fan can impede airflow been there done that tho usually at highway speed not 20mph. From what you describe it's tied to the clutch so will be on whenever the clutch is on regardless of speed?
by 71403
Mon Jun 04, 2018 7:48 am
Forum: Automotive Air Conditioning Forum
Topic: 1999 silverado won't cycle properly
Replies: 1
Views: 99

Re: 1999 silverado won't cycle properly

The PCM can command the compressor clutch relay off for a bunch of reasons independent of the a/c request status. Overtemp, unable idle, low voltage, open/short in relay control ckt, etc.

Are there any current or history codes to lend a clue?
by 71403
Sat Jun 02, 2018 7:53 pm
Forum: Automotive Air Conditioning Forum
Topic: New compressor. Not cooling well.
Replies: 21
Views: 509

Re: New compressor. Not cooling well.

Verify recirc door is closing and temp door actuators are working to full "cold" position.
by 71403
Fri Jun 01, 2018 2:18 pm
Forum: Automotive Air Conditioning Forum
Topic: AC problems, it has refrigerant and compressor works
Replies: 3
Views: 211

Re: AC problems, it has refrigerant and compressor works

Start with seeing if the ECM is commanding a/c clutch engagement to the TIPM. Unfortunately this is one of the ones where a real scan tool is almost mandatory because there's so many things that can inhibit operation. > the pressures even out between the low/high side. Is that normal when the compre...
by 71403
Wed May 30, 2018 7:35 pm
Forum: Automotive Air Conditioning Forum
Topic: A/C system 100% new and not working right
Replies: 7
Views: 288

Re: A/C system 100% new and not working right

Electric fans on those cars (3rd gen f-body) are barely ok at best. Was common "back in the day" to upgrade them when increasing engine performance to keep things cool. 4th gen fans were are near drop in IIRC. Dropping 100psi wetting down condenser suggests not enough airflow, with this mu...
by 71403
Fri Apr 06, 2018 9:33 pm
Forum: Automotive Air Conditioning Forum
Topic: GM/Denso 7SAS17A control valve
Replies: 0
Views: 420

GM/Denso 7SAS17A control valve

Compressor from a 2015 Chevy pickup 5.3 V8, using powertrain for an engine swap and would prefer to keep the stock compressor if possible.

I'd like to keep the variable displacement but need a mechanical control valve to replace the electronic one. Does such a valve exist for Denso compressors?
by 71403
Tue Sep 26, 2017 6:45 pm
Forum: Automotive Air Conditioning Forum
Topic: Why aren't V7s used everywhere?
Replies: 7
Views: 2365

Re: Why aren't V7s used everywhere?

Think a rear-exit V5/V7 would be easier than the top port type. Only because I did a water pump on a '90 G20 last week, it's kinda cramped in there. Didn't see a HPCO on that one IIRC they didn't get one from the factory until R134. The low side pressure control with a V5/7 is the control valve in t...
by 71403
Sat Aug 26, 2017 6:47 pm
Forum: Automotive Air Conditioning Forum
Topic: GM R4 Compressor - New Scroll Design. Better than Piston Type ?
Replies: 26
Views: 7397

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

I'll gamble a V5 with top mount hose block - see '97 Caddy Catera or '05 Buick Century - or a Sanden 7176 would work in place of the Explorer compressor.

Ask GPD for a performance chart for their R4 scroll. Maybe you'll get a different answer than I did.
by 71403
Fri Aug 25, 2017 4:41 pm
Forum: Automotive Air Conditioning Forum
Topic: GM R4 Compressor - New Scroll Design. Better than Piston Type ?
Replies: 26
Views: 7397

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

I may pull an R4 from my local pic-a-part and re-seal it my self. As long as the compressor move freely and hear the compression strokes - suction and exhaust, it should be fine. Correct? Nope - won't know how noisy/rattly it is until it's under load. The greasiest, nastiest, bottom of core barrel ...
by 71403
Thu Aug 24, 2017 5:21 pm
Forum: Automotive Air Conditioning Forum
Topic: GM R4 Compressor - New Scroll Design. Better than Piston Type ?
Replies: 26
Views: 7397

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

Understand your issue with fitment and existing work (and nice work, btw) on brackets but an R4 is the last compressor I'd ever retrofit to something. Few weeks ago asked a supplier for performance chart/curve of an "R4 scroll" compressors and they couldn't produce one - without that impos...

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