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A/C "valve stem" leak help needed

Grimas

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Grimas New Member

Grimas

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I was topping off the freon in my 2001 Suburban and noticed when I removed the connector from the freon can to the valve that freon was escaping/hissing from the valve. Is the internal valve the same as those found in tire valve stems? Can I remove/replace/tighten the valve with some needle nose pliers? I tried to place a peice of plastic over the valve (and screwed the cover over it to try to seal it). It worked for awhile. Any suggestions on the fix?

ken1mod Senior Enthusiast

ken1mod

Posted
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It is definitely a schrader type valve. sometimes they reseal when operated. If the cap seals tightly, it will probably not be necessary to do a perfect repair. many of these shrader valves leak and are sealed quite well by the cap.

 

Ken

OnyxMAX Enthusiast

OnyxMAX

Posted
Posted

put a drop of the correct oil on the valve and connect disconnect the hose 3-4 times should lube the seal. if that dosent work you will need a new schrader iirc their replacable. unfortently that means a drain and fill.

 

hopefully it was just a slow closing valve. the cap shouldn't hold pressure it's basicly for dirt and dust.

ken1mod Senior Enthusiast

ken1mod

Posted
Posted

I work on a/c units of all types. Many times the cap will allow a "pfft" when unscrewed. Many, many schrader valves leak slightly. Most of these caps are designed with an effective seal using o rings or a wrench-on brass cap.

 

I would not recommend a 100.00 repair without seeing that the cap simply does not work. Save the big buck repair and allow the cap to do its job.

 

ken

Grimas New Member

Grimas

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I work on a/c units of all types.  Many times the cap will allow a "pfft" when unscrewed.  Many, many schrader valves leak slightly.  Most of these caps are designed with an effective seal using o rings or a wrench-on brass cap. 

 

I would not recommend a 100.00 repair without seeing that the cap simply does not work.  Save the big buck repair and allow the cap to do its job.

 

ken

 

 

 

 

This was more than just a "pfft" - I got a 10-15 second hiss. The schrader valve had gotten stuck. I used a set of needle-nose plyers to "tighten" the schrader valve slightly hoping to reseat the seal. Placed a but of plastic wrap over the top of the valve and screwed the cap back on. Seems to have held the last recharge...

 

Thanks all.

ken1mod Senior Enthusiast

ken1mod

Posted
Posted

A standard tire valve tool works on these. If you have one of these floating arond, even on a bicycle, use it.

 

ken

 

Ken

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

I would suggest trying to tighten the Shraeder valve rather than trying to replace it. If you remove it, you will loose all your charge.

 

DEWFPO

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