Levicain82 wrote:No signal

Yes, the PCM either provides 12V or a ground to the coil in the relay and close the contact that energizes the compressor clutch coil.

No signal from PCM to energize the relay.

If these valves are designed to leak then why didn't my 1990 Buick leak for twenty years?

72gmc4x4 wrote:http://m.samsclub.com/ip/johnsen-s-r-13 ... lbs/156595

That's cheap!

$4 per can = $5.34 per lb $5 per can = $6.67 per lb $70 per 30 lb = $2.33 per lb Plus, I'm not really interested in cans. I can't see how to charge with cans without introducing air into system and also get an exact weight. Early on I used a small scale and purge the lines like you'd do any other t...

Adding 134a with some oil is what we call a Death Kit. In the mid 1990's they started selling kits with a couple of cans of 134a, some oil & a couple of cheap fittings. Vague instructions. Adding 134a compatible oil to an R12 system with mineral oil and traces of r12 still present. The two oils...

Thanks wptski. What do you use for gauges? Most forums say Yellow Jacket is best. With that T fitting, I won't necessarily need a 4 port. Maybe something like this with the ball end valves and connector you recommended: https://www.amazon.com/Yellow-Jacket-42007-Manifold-Standard/dp/B00R75RR48/ref=...

If you are going to work on mostly R134A but may do some R12 work get a R134A manifold with 1/4" fittings and a hose set with 1/4" fittings as well. Get a set of the R134A quick disconnect adapters along with 1/4" to 1/2" Acme M/F adapters in both directions. Pressure is pressure...

I have a 30lb can of r134a and it has the 1/2 inch outlet that the gauges connect to without needing an adapter. Makes sense, forgot to double check my 30lb jug. I have a Yellow Jacket R134A gauge set, they are all 1/4", R134A adapters I use are separate CPS brand with built in on/off valves w...

If you get a regulator, buy this adapter as well if the regulator has a 1/4 in outlet. It took me quite a bit of time calling and driving around plus it was $10 locally. https://www.amazon.com/R134a-Brass-Adapter-Female-Vacuum/dp/B00PI6PTAM/ref=sr_1_4?s=hi&ie=UTF8&qid=1466614889&sr=1-4&...