A/C Schrader valve
Thread Starter
Pro
Joined: Apr 2008
Posts: 586
Likes: 119
From: Saint Cloud, FL
A/C Schrader valve
Search engine's stalling so I'll post the question.
Has anyone had their schrader valve for the A/C (high or low pressure) leak? Can you replace it? If so would you have a part number for it?
Thanks...
Has anyone had their schrader valve for the A/C (high or low pressure) leak? Can you replace it? If so would you have a part number for it?
Thanks...
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
Yes you can replace it...the valve just screws in and out. Beware that any remaining freon in the system will escape when you unscrew the valve. The schrader valve's seat is made of special composite for ac systems do not confuse it with a standard tire stem schrader valve. Any auto shop should have these...but they can come it different lengths so remove yours with a "valve core tool" and take it with you when you go to buy a new one for comparisons purposes.
Thread Starter
Pro
Joined: Apr 2008
Posts: 586
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From: Saint Cloud, FL
Thanks. That's what I thought from looking at it and the fact that the FSM mentions replacing it. I have a parts list for the C4 but it doesn't specify a GM part number for the valve. That sort of led to the confusion.
Thread Starter
Pro
Joined: Apr 2008
Posts: 586
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From: Saint Cloud, FL
Yes. Found the part. GM Part # 52458184. Was $8.88 at local GM dealership. It's the valve on the High Side for a 1994. Apparently the schrader valve itself in this location is not replacable. Gona have the shop replace the valve and salvage what little bit of charge is left in the system.
Le Mans Master
Joined: Oct 2006
Posts: 6,842
Likes: 285
From: Palmdale CA
Don't replace it! After rebuilding the top end and starting it for the first time, I looked out at the engine and saw a stream of fuel shooting out of that valve. I tried pushing it, hoping it was just clogged with something, then called my little brother, the Master Mechanic at a dealership.
All I had to do was tighten the inside part of the valve stem. I used a valve stem cap that had a slot tightener built in the top. A slight twist or two and it was good to go. That same schrader valve comes loose on car tires too.
All I had to do was tighten the inside part of the valve stem. I used a valve stem cap that had a slot tightener built in the top. A slight twist or two and it was good to go. That same schrader valve comes loose on car tires too.
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Safety Car
Joined: Jul 2004
Posts: 3,845
Likes: 30
Don't replace it! After rebuilding the top end and starting it for the first time, I looked out at the engine and saw a stream of fuel shooting out of that valve. I tried pushing it, hoping it was just clogged with something, then called my little brother, the Master Mechanic at a dealership.
All I had to do was tighten the inside part of the valve stem. I used a valve stem cap that had a slot tightener built in the top. A slight twist or two and it was good to go. That same schrader valve comes loose on car tires too.
All I had to do was tighten the inside part of the valve stem. I used a valve stem cap that had a slot tightener built in the top. A slight twist or two and it was good to go. That same schrader valve comes loose on car tires too.
Safety Car
Joined: Jul 2004
Posts: 3,845
Likes: 30
...the "seal"material on the valve is different and some are "disolve-able" under contact with certain compounds or chemicals....
..they also make valve replacing tools that you can replace the valve w/out loosing the charge....i know, i have one and have had to do it.....
...in a lot of cases (not all) tightening a failed valve stem in SOME applications only tends to put off the enevitable....
Thread Starter
Pro
Joined: Apr 2008
Posts: 586
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From: Saint Cloud, FL
So I had the valve replaced this morning and the system recharged. Now it's not working. High and Low side switches are connected, all fuses good, and compressor clutch control is connected. No codes. Before the repair the clutch was cycling due to loss of freon. I disconnected clutch harness until valve was repaired. Any ideas? I'll look at my FSM tonight.
Safety Car
Joined: Jul 2004
Posts: 3,845
Likes: 30
So I had the valve replaced this morning and the system recharged. Now it's not working. High and Low side switches are connected, all fuses good, and compressor clutch control is connected. No codes. Before the repair the clutch was cycling due to loss of freon. I disconnected clutch harness until valve was repaired. Any ideas? I'll look at my FSM tonight.
Thread Starter
Pro
Joined: Apr 2008
Posts: 586
Likes: 119
From: Saint Cloud, FL
...1st, determine that the clutch is good by applying 12v to it...if that works, work backwards!...then, tale a short piece of wire and after removing the lp switch, short out the contacts in the plug ..if it comes on then the problem most likely lies there...gotta step out a bit and wil check this when i get back in......
Here's the link: http://forums.corvetteforum.com/show...7&postcount=10
I checked codes during lunch and found DTC 66 and DTC 67, both A/C related codes. I DTC 67 must get thrown when you disconnect the clutch harness. I cleared the codes and started the car. The A/C is now working. Too bad I didn't try the A/C before clearing the codes. I don't know if this is not just coincidental. Nonetheless, it's working!!!!
Last edited by carllangford; Oct 8, 2008 at 01:38 PM.
