Search found 21 matches

by 71403
Tue Sep 26, 2017 6:45 pm
Forum: Automotive Air Conditioning Forum
Topic: Why aren't V7s used everywhere?
Replies: 7
Views: 567

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: 1991

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: 1991

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: 1991

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...
by 71403
Mon Aug 14, 2017 6:06 pm
Forum: Automotive Air Conditioning Forum
Topic: Subaru AC marginal
Replies: 2
Views: 349

Re: Subaru AC marginal

Have a '14 Outback in the stable here (Northeastern US) it keeps the creatures inside cool in the low 40's. On the hottest days can kinda feel a wall of heat behind your head, like the system is marginal for the interior sq/ft of a station wagon. At night on highway vents will get into the high 30's...
by 71403
Mon Aug 14, 2017 8:41 am
Forum: Automotive Air Conditioning Forum
Topic: GPD R4 scroll
Replies: 3
Views: 460

GPD R4 scroll

Local parts house mentioned some GPD-branded R4 compressors are now a scroll design in the same R4 package. Haven't had one here yet.

Would be nice to have a drop-in R4 replacement curious if anyone has tried one yet.
by 71403
Tue Jul 18, 2017 4:27 pm
Forum: Automotive Air Conditioning Forum
Topic: High Pressure issue R4 Compressor Chevrolet Tahoe
Replies: 11
Views: 1031

Re: High Pressure issue R4 Compressor Chevrolet Tahoe

Multiple passes "to get the air out" doesn't sound right. Overcharge, high side restriction, air, all good candidates.

Had a '96 GMC doing very similar to yours and it was an overcharge. (3.5lbs recovered from a system spec'd at 2lbs)
by 71403
Tue Jul 18, 2017 12:28 pm
Forum: Automotive Air Conditioning Forum
Topic: High Pressure issue R4 Compressor Chevrolet Tahoe
Replies: 11
Views: 1031

Re: High Pressure issue R4 Compressor Chevrolet Tahoe

Fans should be controlled by the high side pressure and/or state of a/c request not just engine temp.

Is the LS engine PCM controlling the fans?
by 71403
Tue Jul 18, 2017 7:31 am
Forum: Automotive Air Conditioning Forum
Topic: Compressor will not cycle with LPCO jumpered
Replies: 6
Views: 553

Re: Compressor will not cycle with LPCO jumpered

At static pressure both switches are closed / have continuity. Check there's +12v at the LPCO on the light blue wire when it's connected to the switch (back probe) and a/c is requested. If so both switches are good, pressures are in range and head unit is supplying +12v. If that passes check at at P...
by 71403
Mon Jul 17, 2017 8:06 pm
Forum: Automotive Air Conditioning Forum
Topic: Compressor will not cycle with LPCO jumpered
Replies: 6
Views: 553

Re: Compressor will not cycle with LPCO jumpered

There's also the high pressure cutout switch on the back of the compressor. Might be easier to back-probe at PCM can verify a/c request and compressor relay control at the same time. Is this an early 90's full size FWD Buick? Been a while but recall there were problems with moisture/corrosion in the...

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