Thanks, Tim. Noted for future.

If it has the original Denso compressor, the thread size is M10-1.5

Check with Tim at ACKits.com for the correct OEM part.

An Internet search turned up this one: https://www.ebay.com/itm/NEW-A-C-Compre ... 4048659882

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 ...

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.

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...

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 ...

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...

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....

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.

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.