Can I replace the AC low pressure valve myself? It looks like a
bicycle shrader valve. I heard there's a tool for replacing it under
pressure? If this is not diy, how much should a reasonable shop
charge? I have a 96 K1500 Suburban 5.7L. TIA!

Roy

In article
<1179601174.973850.211380 (AT) k79g2000hse (DOT) googlegroups.com>,
Roy <reichwein (AT) gmail (DOT) com> wrote:

Depends on what you mean by "valve."

If it's the valve core, yes, there are tools that allow it to be
replaced without discharging the system.
if it's the whole valve fitting, the system has to be discharged,
a special socket is needed to fit the fitting, then evacuate and
recharge according to service procedures.

On May 19, 12:59 pm, aarcuda69062 <nonel... (AT) sbcglobal (DOT) net> wrote:

Yeah, I meant the core. The cap has an oily film on it, and I can see
a bubble come out of the valve once in while, particularly after
removing the guage it'll bubble slowly for a while. The original
symptom was no cold air. The clutch is cycling on and off every 5
seconds or so, which indicates low coolant pressure. So I thought I'd
take a shot at replacing the valve core before throwing another can of
R134 into it. Is acsource.com the place to get the stuff, or are there
other places? Thanks again!