Quote:
Originally Posted by billjam
OK, I know it's the wrong season to be asking these questions for most of you, but I suspect that my AC expansion valve has died and I'd just like to be sure before I rip it out. This doesn't look like being fun, especially as I will be doing it next weekend when the temperature is forecast to be 41*C here.
My AC is fully charged and runs cool initially, but within a minute or so, it stops running cold. The AC guy says the compressor is compressing and everything else looks OK. It had a new filter/drier fitted only a couple of thousand miles ago.
Mechanic reckons the expansion valve "could" be the problem.
I don't know which pipe goes where, but pipe A is ambient temp and pipe B is cool (not cold). I think this whole valve should be really cold when it is working correctly, yes?
So what's the consensus? Dead valve?
A few pics ...
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The pressure ratio (high side v/s low side) should be about 10:1 @ 2K rpm's.
Give please us more data on the H/L sides before and after the A/C degrades.
Our '86 runs about 24-240/260 on a 70 degree days @ 2K rpm's.
System evacuation/vaccum check would be my first step.
Also, there is a forum member (Kruell)? who has posted a few very credible A/C threads.
Good luck,
Gerry