Leaking schrader valve in AC low pressure port? - Toyota Nation Forum : Toyota Car and Truck Forums
Corolla 8th Generation (1998-2002) Specific discussion of the 8th generation

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post #1 of 3 Old 05-06-2019, 10:50 PM Thread Starter
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Leaking schrader valve in AC low pressure port?

Mine is leaking and I'm having trouble finding a replacement. I picked up some from Autostoned, but they are the wrong size.

The one I pulled out of my Corolla is much larger (wider at least) than the ones from the store, which were the same size as what you'd use for a tire.

I am 99% sure it's the valve core, as when I remove the dust cap, there's gas trapped in there.

Has anyone else had this problem?

2000 Corolla CE Automatic
2005 Mustang GT Premium coupe, 5 speed
1988 Mustang GT 5.0. 5 speed, lots of mods
1977 F150 Straight 6, 3 on the tree
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post #2 of 3 Old 05-07-2019, 03:59 PM Thread Starter
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OK I went to U-Pull-&-Pray and got me a few valve cores from other Toyotas. I popped them in my car, high side and low side, and I just got done vacuuming and re-re-re-charging. So the test will be in a few hours when I spin off the dust caps and see if there's any leaked refrigerant causing pressure under them.
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2000 Corolla CE Automatic
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post #3 of 3 Old 05-08-2019, 11:28 AM Thread Starter
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Welp, I spun off those dust caps a few or several hours after my previous post, but again was greeted with the sound of gas whooshing out as the cap loosened.:headba ng:

So I cranked those plastic caps back down as tight as can be without breaking them, and I hope that my AC will last the summer - although I'm having my doubts.

My car is a 2000. I got one valve core from a 2001 or so Celica, and the other two I got from later Avalons. Comparing the three, one of them had a weaker spring like the one in my Corolla, but the other two seemed a little stronger, so I put them in - I'll assume that they are the later valve cores.

The Schrader valves aren't supposed to leak like that to my knowledge. I did some reading and saw that some HVAC pros swear by the cap, saying that the Schraders will always leak, and the cap can stop, or slow, that leakage. Those guys seem to swear by brass caps with O-rings, which sounds right to me. But I'm not aware of anything like that for R134A fittings.

I converted my previous Rolla, a '93, to R134A and it worked for the five years that I owned it, with probably close to zero leakage.
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2000 Corolla CE Automatic
2005 Mustang GT Premium coupe, 5 speed
1988 Mustang GT 5.0. 5 speed, lots of mods
1977 F150 Straight 6, 3 on the tree
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