TX Tahoe Z71

iTrader: (28)

So tested voltage between 85 and 86 and got 13.5ish with the a/c on and low pressure bridged. Turned a/c off, still 13.5v, unbridged low pressure sensor, still 13.5. Checked 30 to 87, also 13.5v (which is expected).

So why am I seeing voltage with the a/c off?

Calling Lloyd today to see if I can bring it by to scan.

TX Tahoe Z71

iTrader: (28)

So turns out it was low on refrigerant, and that the low pressure sensor on the accumulator isn't the only pressure sensor (so I would have had to jump more than one to get the compressor to kick on). Lloyd-TX got me topped off and put some dye in there in case there is a leak.

Really nice guy, highly recommend him to anyone in the Houston area.

nonnieselman

iTrader: (10)

So your good to go again??

yea theres a high and low pressure switch

or atleast the last time i worked on one there was, but that was on a tractor.

TX Tahoe Z71

iTrader: (28)

Good to go, blows ice cold now.

I should have kept the wiring diagram he printed out for me, forgot to. But he said something along the lines of there being another low pressure sensor somewhere, which is why the compressor wasn't kicking on when I jumped just the one on the accumulator.

TX Tahoe Z71

iTrader: (28)

So turned out I wasn't good to go, it leaked out again within a week. Took it back, high side valve (IIRC) was leaking, shop replaced it and recharged the system. Leaked out again within a week, so that was not big leak.

I discovered that it was a leaky high pressure hose. Don't know why the UV leak detector light didn't show it, but it happens I guess. Had a shop replace the hose, they tested for vacuum, it held, so recharged it and it's been blowing cold for the past week. Previously, it would be blowing warm by now, so I think I'm good to go. Initially we thought it was the evaporator because of how quickly it was losing refrigerant, but luckily didn't start tearing the dash apart as that would have run over $1000 and not solved my problem.

TX Tahoe Z71

iTrader: (28)

So the second shop found a leaking high pressure hose, replaced it and recharged ($388). It has since leaked out. Took it back and they found a leaking O-ring, replaced it and recharged (free of charge this time). It has since leaked out again, so I think it's the evaporator, which is what I have been thinking all along since it leaks out in a matter of a few days (so big leak, not a leaky o-ring). But neither shop can find a leak and say it's fixed each time.

Soooo, I am going to take it back to the second shop because they stood behind their work the second time and didn't charge me $120+ for the recharge or parts. I will update once it stays cool for more than a week...

Robert91RS

iTrader: (2)

Damn bud, if it wasn't for bad luck you wouldn't have any at all. Shoot me a pm if you need a part# on the evaporator.

oakley6575

iTrader: (5)

388$ for a recharge and hose?

TX Tahoe Z71

iTrader: (28)

Haha, thanks.

Yeah, if it had fixed the problem, I wouldn't have been pissed. This whole debacle is why I do my own repairs, but with A/C stuff, I just don't have the tools (though after this, I would have been better off buying them).

2doorfury

iTrader: (12)

check schreader valves, if you do a vacum leak test with the machine, it wont pick up leaking schreader valves since thats where the a/c machine lines connect to.