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Stuck schrader valve

BG1 on Tue August 03, 2010 12:49 PM User is offline

Year: 1976
Make: Pontiac
Model: Firebird
Engine Size: 5.7
Refrigerant Type: r134a
Country of Origin: United States

At the connections at the rear of the ac compressor there is a high pressure port that has a schrader valve in it and I wanted to put in a new one before I recharge the system. I can unscrew it until it will spin but it will not come out of the hole, I can screw it back in until it seats and try it again and when it gets to the top it just spins.

ACProf on Tue August 03, 2010 1:28 PM User is offline

Sounds like the rubber seal has splayed out and is catching on the internal threads of the fitting. Grab the flats of the valve with a needle nose pliers, work it side to side and give it a tug or two. Make sure ALL the seal rubber is there.

BG1 on Tue August 03, 2010 2:29 PM User is offline

I tried that and ended up pulling the top piece of the valve core that is threaded off. I have the hose assemble off would putting some oil at the bottom of the valve core (from the bottom) help?

bohica2xo on Tue August 03, 2010 2:59 PM User is offline

Well, since you are converting, all you want is the valve core gone. Punch, drill or otherwise remove it - then clean the swarf from the hose.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

BG1 on Wed August 04, 2010 6:24 PM User is offline

Where can I get a adapter fitting for the r134a that will fit the low pressure side on a 1976-1990 gm and have the valve core in it. I have a couple of them but they just screw over the existing one and uses its valve core. I just picked up a set at the auto parts and it does not have the one I need.

mk378 on Wed August 04, 2010 6:51 PM User is offline

Use this one. You might find the same one at more pro-oriented local parts stores. Note that it is made of steel and has a yellow / gold chromate coating. Avoid the aluminum Interdynamics ones from chain parts stores.

BG1 on Thu August 05, 2010 4:58 PM User is offline

Do you know what brand this is? Do you know which one the high pressure side takes? Thanks

bohica2xo on Thu August 05, 2010 5:51 PM User is offline

BG:

Here are all of the fittings On one PAGE

Your vehicle should have the 7/16" thread on both the high & low side. Ford occasionally used a 3/8" thread on the high side.

It is worth ordering the fittings from AMA to get the good steel stuff. Sometimes due to OEM fitting placement, adding an adapter is best done with a 90 degree fitting. Look your system over, and order what you need from AMA. I have had no luck finding some of those fittings locally - I keep a bag of them stashed now.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

NickD on Thu August 05, 2010 6:20 PM User is offline

There is a simple inexpensive 4 way valve core tool you can by just about anywhere. One end of it is pointed with a self threading bit that you can screw in where your valve stem broke off then pull the rest of it out.

Could scan several of mine, but easier to post a photo off the net.



You won't need those valve stems in this one, seen most without those.

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