There are no aftermarket listings for the expansion valve for my car. None. Even the one that our dear sponsor has listed is incorrect. My questions are:
Post up a pic of the one you need and I see if I can find it.
A degree or two is not going to be a deal breaker as things vary in automotive a/c systems. But if you can get the correct item it is best.
How come we don't fool around with superheat, wet bulb temperatures, and all that with MVAC, but do with HVAC, least I don't, maybe I am dumb.
Did this car come stock with R-134a or did Mazda bribe the EPA like GM did with a bunch of SUV's back in 1994 still using R-12. But R-134a was new to the manufacturers as it was to us, did have a learning curve. Some Japanese vehicles took another four years to work out some problems. The condenser was the major one.
Anyway, sounds like you are having a problem, what is it?
Alright. I've managed to find listings for various valves that should mechanically fit. Now it is down to picking the right superheat.
The superheats I've found are -.5 (a factory R-12 car with a variable displacement compressor (is it called supercool when negative? LOL)), 1.5, 3, and 5. The -.5 is out since that would seem to guarantee slugging. So that leaves 1.5,3, and 5. These are all going to, presumably be charged with R-134a as the working gas in the bulb. The applications they are for are all in the R-134a era.
My big question is this: Can I go with the 1.5 to get the coldest evaporator possible, or is that a bad idea since I'm going to be running R-12 and that slim of a margin with R-134a as the working gas in the TXV will put me into slugging territory when R-12 is the actual refrigerant in the system?
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