Search found 176 matches

by Dougflas
Wed Jul 26, 2017 7:47 am
Forum: Automotive Air Conditioning Forum
Topic: 72 DeVile retrofit
Replies: 1
Views: 14

Re: 72 DeVile retrofit

Keep the POA and expansion valve set up. All driers made now can handle r134a. I personally would keep it R12 also.
by Dougflas
Sun Jul 23, 2017 5:27 pm
Forum: Automotive Air Conditioning Forum
Topic: 1994 Silverado Low side pressure pegged out with a/c off?
Replies: 1
Views: 37

Re: 1994 Silverado Low side pressure pegged out with a/c off?

When not running, the system is equalized meaning both hi and lo side PSI are the same. The lo side gauge does not indicate the same PSI as the hi side so the lo side pegs. Perfectly normal.
by Dougflas
Fri Jul 21, 2017 4:14 pm
Forum: Automotive Air Conditioning Forum
Topic: R12 -> R134a 1989 Porsche Kit Questions
Replies: 74
Views: 777

Re: R12 -> R134a 1989 Porsche Kit Questions

I don't have a way to charge it. Need to take to the shop and they can't get to it until the first week in Aug. Yes you do have a way to charge it. Two hours of running a vacuum is not overkill. That system was open for a long time. If the pump usage doesn't cost you anything, let it run a long tim...
by Dougflas
Thu Jul 20, 2017 5:46 pm
Forum: Automotive Air Conditioning Forum
Topic: R12 -> R134a 1989 Porsche Kit Questions
Replies: 74
Views: 777

Re: R12 -> R134a 1989 Porsche Kit Questions

Those venture pumps are a POS. If you're waiting a week or so, pull the best vacuum you can and place the system under positive pressure.
by Dougflas
Wed Jul 19, 2017 7:25 am
Forum: Automotive Air Conditioning Forum
Topic: High Pressure issue R4 Compressor Chevrolet Tahoe
Replies: 11
Views: 143

Re: High Pressure issue R4 Compressor Chevrolet Tahoe

Hot wire the fans to 12volts as a test. As soon as the key is turned, the fans come on.
by Dougflas
Wed Jul 19, 2017 7:17 am
Forum: Automotive Air Conditioning Forum
Topic: R12 -> R134a 1989 Porsche Kit Questions
Replies: 74
Views: 777

Re: R12 -> R134a 1989 Porsche Kit Questions

I have never seen brass caps for R134a either factory or replacement. You can get them for R12 systems thru HVAC supply stores.
by Dougflas
Sun Jul 16, 2017 4:53 pm
Forum: Automotive Air Conditioning Forum
Topic: R12 -> R134a 1989 Porsche Kit Questions
Replies: 74
Views: 777

Re: R12 -> R134a 1989 Porsche Kit Questions

Thanks Tim and Cusser, It looks like HNBR O-rings come in black or green. They may not be exactly the same (e.g. different durometer) https://www.globaloring.com/oring-colors/ I guess I'll assume the QD fittings for R134a will be OK. It makes sense after all this time at least the R134a fittings sh...
by Dougflas
Wed Jul 12, 2017 7:34 am
Forum: Automotive Air Conditioning Forum
Topic: What is this scale on my manifold gauges for?
Replies: 8
Views: 200

Re: What is this scale on my manifold gauges for?

I had to copy your image into Photoshop to sharpen it enough to see the scales. Let's imagine the needle is at the 30 psi position. The first scale (in light blue) is the R134a scale. The temp of the refrigerant at sea level is 35* F. The next scale (green) is the R22 scale. At the same PSI, the tem...
by Dougflas
Tue Jul 11, 2017 2:32 pm
Forum: Automotive Air Conditioning Forum
Topic: questions
Replies: 2
Views: 51

Re: questions

Best way to verify a refrigerant charge is to recover and weigh the proper charge. As you get experienced, you can fudge it. In today's vehicles, the charge is small so a few oz can make a difference.
by Dougflas
Tue Jul 11, 2017 12:30 pm
Forum: Automotive Air Conditioning Forum
Topic: 1995 Acura NSX
Replies: 5
Views: 63

Re: 1995 Acura NSX

System can hold a vacuum and still have a leak. Dye is your friend.

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