So I have noticed for the last couple weeks that my A/C wasn't blowing as cold as normally. Finally today I checked the pressure for which it had 5lbs. It has seemed to be a slow leak because the air just started feeling warmer and warmer. Any ideas were it could leaking from? Anybody else have a slow leak and were able to find it? Will it cause problems to continue to fill it with freon until I can have it fixed if I can not find the leak myself?

Its the truck in my sig.

Thanks for any and all comments!

 

How often do you wash your engine bay? If it is relatively clean it will be easy to spot the leak.. Refrigerant has oil in for the a/c pump, when it leaks the oil residue will attract dirt to the leak, look for build-up at all joints, fittings, and switches...

 

Been doing some more searching. It looks like there may be oil coming out of the high pressure fitting, from underneathe the cap...? Any way to change the bicycle tube looking fitting thats under the cap to see if thats it?

Thanks!

 

dont pull the fitting until the system is pulled down... Even if there is still 5 pound in there... but yes a simple valve stem tool can remove it..

 

OK! Thanks for all the quick help!

 

There is a tool you can use to replace the valve stem while the system is still under pressure

 

Name of tool and where can I find it?

Thanks!

 

I've never seen one.... Well I've seen/have a tool that will remove the shradder valve while under pressure, but not replace it too.... Don't doubt ya, just would like more info...

 

yellowjacket.com. It is a ball valve tool. You can unscrew the valve stem and pull it out into the tool then use the ball valve to close off the system then remove the valve stem replace a new valve stem then open the ball valve to allow you to insert new valve stem with no loss of refrigerant. Great tool.

 

I'd inject a little tracer dye into it, then run the thing for a day or so, then get back in there with a blaclight and trust me...you'll see the leak. I see alot of trucks coming in my shop with leaks around the back side of the compressor where the lines go in. And every now and then I see some that leak around the input shaft of the compressor.