Search found 242 matches

by JohnHere
Sun Jun 28, 2020 11:16 am
Forum: Automotive Air Conditioning Forum
Topic: Compressor relief valve diagnosis
Replies: 15
Views: 1462

Re: Compressor relief valve diagnosis

Many times, when an HPRV opens it never re-seats properly. I would replace it given the age of the vehicle. The same thing often happens with the Temperature Pressure Relief (TPR) valve on a home's water heater. Although some people suggest testing the TPR valve yearly by manually opening it, I've ...
by JohnHere
Wed Jun 24, 2020 10:00 am
Forum: Automotive Air Conditioning Forum
Topic: "sticky" shraeder valves at hi/lo port
Replies: 6
Views: 598

Re: "sticky" shraeder valves at hi/lo port

I think I'm responding to r-mm and not Al9. But sure, go ahead and lubricate the entire valve core with mineral oil (compatible with R-12) or DEC PAG (compatible with R-134a) just before installation. Doing so will help the o-ring and the valve itself give the best possible seal.
by JohnHere
Wed Jun 24, 2020 8:29 am
Forum: Automotive Air Conditioning Forum
Topic: "sticky" shraeder valves at hi/lo port
Replies: 6
Views: 598

Re: "sticky" shraeder valves at hi/lo port

A few comments: With a properly operating system, the low side shouldn't show negative pressure (In. Hg.) on the manifold gauge set unless there's a blockage of some sort or a problem with the metering device (TXV or OT). The Schrader valve on the low side should be seeing positive pressure of aroun...
by JohnHere
Wed Jun 24, 2020 7:05 am
Forum: Automotive Air Conditioning Forum
Topic: 12, 12a, 134a
Replies: 7
Views: 673

Re: 12, 12a, 134a

R-12 is not the same as R-12a. The latter, a so-called alternative refrigerant (RedTek, etc.), is a hydrocarbon-based, highly flammable, propane formulation that is marketed as a replacement for R-12. Moreover, R-12a often contains additives, like sealers and "performance enhancers," that ...
by JohnHere
Sat Jun 20, 2020 8:00 am
Forum: Automotive Air Conditioning Forum
Topic: 2007 Honda CRV Low Pressures
Replies: 11
Views: 1190

Re: 2007 Honda CRV Low Pressures

Okay, good...you're within the spec for the refrigerant charge. Unfortunately, there's no way to gauge how much oil the system contains now. The only way to know for sure is to disassemble everything, flush all the flushable components, drain the compressor, and refill it to spec. Re-reading the thr...
by JohnHere
Fri Jun 19, 2020 2:11 pm
Forum: Automotive Air Conditioning Forum
Topic: 2007 Honda CRV Low Pressures
Replies: 11
Views: 1190

Re: 2007 Honda CRV Low Pressures

Unless the under-hood sticker specifies 16 ounces of refrigerant, my references list 18.0 ounces of R-134a. So it might be undercharged by a couple of ounces, which is significant. When adding the oil, was the system completely empty of oil, including the new compressor? The specification is only 4....
by JohnHere
Fri Jun 19, 2020 1:32 pm
Forum: Automotive Air Conditioning Forum
Topic: High 'Low-Side' Pressure
Replies: 18
Views: 2909

Re: High 'Low-Side' Pressure

Glad that you have the system running—just in time for summer—and that you decided to return the charging kit. Visit again should you need us.
by JohnHere
Thu Jun 18, 2020 6:24 pm
Forum: Automotive Air Conditioning Forum
Topic: New poster that needs guidance
Replies: 5
Views: 616

Re: New poster that needs guidance

Let's begin with the year, make, and model of your vehicle, which I don't think you mentioned yet, and we'll go from there.
by JohnHere
Mon Jun 15, 2020 7:56 am
Forum: Automotive Air Conditioning Forum
Topic: 2007 Honda CRV Low Pressures
Replies: 11
Views: 1190

Re: 2007 Honda CRV Low Pressures

Even at 38 PSI on the low side, you should be seeing vent temps lower than 58 to 60 degrees. So I agree that heated air is probably mixing in someplace.

Another question comes to mind. When you replaced all the components, how did you handle the oil--that is, what did you put in and how much?
by JohnHere
Sat Jun 13, 2020 8:36 am
Forum: Automotive Air Conditioning Procedures, Tips and FAQ.
Topic: 92 Honda Accord Wagon R134A Conversion
Replies: 6
Views: 1239

Re: 92 Honda Accord Wagon R134A Conversion

I forgot to mention that I would definitely stay away from the alternative hydrocarbon-based refrigerants containing propane, isobutane, and the like, especially when R-134a is still readily available.

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