Removing AC High Pressure Schrader Core

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Sep 5, 2014 | 12:31 AM

C4ProjectCar

Thread Starter

Drifting

Joined: Jul 2014

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From: Lynchburg, VA

Removing AC High Pressure Schrader Core

My AC is totally empty, so I'm refilling it with R-134a. Part of that is replacing all of the seals in the AC lines and replacing the Schrader valves. I got all of the valve cores out without incident until I came to the high pressure valve. I've tried two sizes of core removal tools and neither worked. I came across something saying sometimes these valves are unserviceable, but found little to support it.
I need to replace the high pressure side Schrader valve core, but can't remove it. Can anyone help?
It's a 1990 Corvette. The only applicable RPO (I think) would be C68, the electronic climate control.

Sep 5, 2014 | 09:38 AM

jgalfo

Instructor

Joined: Jul 2012

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From: Winter Garden Florida

I think you need to replace a high side hose with the R134 valve in it. that's what I had to do when I converted mine to R134. cost me new compressor, evaporator, hose with valve and metering tube.

good luck

John

Sep 5, 2014 | 09:42 AM

WVZR-1

Team Owner

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Quote:

Originally Posted by jgalfo

I believe there's a high-side adapter that has the provision to depress the Schrader valve when it's installed so that the replacement of the entire line is NOT needed.

Sep 5, 2014 | 10:16 AM

Churchkey

Melting Slicks

Joined: Sep 2008

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From: Cherokee National Forest TN

WVZR-1 is spot on, use an adapter fitting.

http://autoacrepairs.com/134a%20CONV...20FITTINGS.htm

BTW you can get by without changing out the high side fitting if your AC gauges have the short 134 hoses adapted to the 12 hoses. Use the 12 high side hose to read high side pressure.

Last edited by Churchkey; Sep 5, 2014 at 10:22 AM.

Sep 5, 2014 | 01:51 PM

C4ProjectCar

Thread Starter

Drifting

Joined: Jul 2014

Posts: 1,426

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From: Lynchburg, VA

Quote:

Originally Posted by jgalfo

I looked and I couldn't find that hose. Where did you get yours?

Sep 5, 2014 | 02:07 PM

C4ProjectCar

Thread Starter

Drifting

Joined: Jul 2014

Posts: 1,426

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From: Lynchburg, VA

Quote:

Originally Posted by WVZR-1

I believe there's a high-side adapter that has the provision to depress the Schrader valve when it's installed so that the replacement of the entire line is NOT needed.

Quote:

Originally Posted by Churchkey

I already have the adapter that allows the freon can to connect to the fitting. I failed to make this clear initially, but the reason I need to replace the valve is because I believe it is leaking.
Or do those fittings have a Schrader valve inside them for permanent use?
I notice they say "MAKE SURE YOU REMOVE THE OLD R-12 SCHRADER VALVE BEFORE USING THESE VALVES."
My problem is that I can't remove the old valve.

Thanks for the help!

Sep 5, 2014 | 02:42 PM

Churchkey

Melting Slicks

Joined: Sep 2008

Posts: 2,376

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From: Cherokee National Forest TN

Tire valve stem tools work on occasion, you probably need a tool designed for Schrader valves. Although they look like a tire valve core removal tool the slot that the flats of the Schrader valve fit into are deeper + the slotted stem is heavy duty.