GM accumulator pressure switch leaking

[JHZR2]

My 98 Chevy truck has a leaky pressure switch on the accumulator.

From last year, this was the pic that gave it away.

Hardly use the truck n the last many months, so didnt do anything with it. Finally got a replacement part from AZ and put it in with a new o-ring. It hisses. Seems to hiss least when very lose, but as I tighten it, the sound varies. I think the o ring is right. Put the old o ring and sensor back on, same deal. What gives? Lubed the o ring with Vaseline as I didn't have nylog, but I can't imaging that would cause this.

Any ideas/suggestions? Can anyone verify the oring size?

Thanks!!

 

[bullwinkle]

Cracked/worn threads in the accumulator?

 

[JethroBodine]

Put some white loctite on the threads and allow to cure for 24 hours before starting.

http://www.amazon.com/Loctite-Thread-Sealant-PRICE-TUBE/dp/B000O03DH8

 

[JHZR2]

Originally Posted By: bullwinkle
Cracked/worn threads in the accumulator?


Well this is the first time it's ever been off, and the truck held charge perfect until it was 15 years old.

I assume once the schrader is pressed, it's the o-ring doing the sealing, right?

 

[JHZR2]

Ok so the parts store item was garbage and leaked. Finally got a new delco switch with a new o ring that goes onto the male fitting on the accumulator.

Do I need to use any lube to get the oring on? Vaseline? Nylog? Seemed dry from the factory and worked for 10+ years...

No wrench, just finger tight, right?

Anything else I need to know??

Thanks!

 

[SatinSilver]

Originally Posted By: JethroBodine
Put some white loctite on the threads and allow to cure for 24 hours before starting.

http://www.amazon.com/Loctite-Thread-Sealant-PRICE-TUBE/dp/B000O03DH8


+1, this sounds like a good idea to me but I'm not an expert. Looks like the truck is the same color as Technologs engine bay.

 

[JHZR2]

There was no thread sealant on there originally. But often people discuss living I rings in AC systems. I don't have refrigeration oil though...

My truck is green.

 

[JHZR2]

Worked fine. OE switch sealed perfect while the AZ and AAP switches both leaked.

 

[SatinSilver]

Yes, I could see the patch of green in the engine bay and I think that's the same color as his Blazer.

Kind of curious if the oem part was that much more than AZ/AAP? The important thing is it doesn't leak anymore.

 

[JHZR2]

Yes it was a good deal more money. But it also came with a new o ring and harness-side rubber piece.

Exactly, all that matters is that it doesn't leak.