richyung601 Posted May 13, 2015 Share Posted May 13, 2015 Hello my CH 613 a/c works blow cold when I charge the system then it started to blow warm air so I looked around and heard a leak around the expansion valve that's sits near the firewall my question here is it a pain to change that valve. Someone told me that I would have to take the dash out to get to it but as I looked closer I don't think so please help thanks. I took a few pics Quote Link to comment https://www.bigmacktrucks.com/topic/39993-97-ch-613-ac-system-leak/ Share on other sites More sharing options...
theakerstwo Posted May 13, 2015 Share Posted May 13, 2015 With the proper tools it can be changed there. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/39993-97-ch-613-ac-system-leak/#findComment-289709 Share on other sites More sharing options...
alex g Posted May 13, 2015 Share Posted May 13, 2015 I might have a new valve here if you have to finding one Quote Link to comment https://www.bigmacktrucks.com/topic/39993-97-ch-613-ac-system-leak/#findComment-289713 Share on other sites More sharing options...
Td713001033 Posted May 13, 2015 Share Posted May 13, 2015 richyung601 if you have a Freon leak at any point in the system you should see a oil stain from the Freon/oil mix in the system. I do not see that in the pic. if you do need to change the expansion valve the main problem u will have is getting the brass nuts on the evap. core to break free from the aluminum valve. also those lines are steel nuts in the aluminum valve. you will need good line wrenches. do not use open end wrenches . you should heat the nuts with small propane torch. watch out for the foam gasket if it catches fire you will need more than a new a/c system. if the heat does not work we have used a cut off wheel to slice the block at the threaded area. Been there Done all of that . good luck. Quote Link to comment https://www.bigmacktrucks.com/topic/39993-97-ch-613-ac-system-leak/#findComment-289717 Share on other sites More sharing options...
41chevy Posted May 13, 2015 Share Posted May 13, 2015 Maybe before you start changing parts, how about putting in a can of dye check to pin point the leak. 1 Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/39993-97-ch-613-ac-system-leak/#findComment-289721 Share on other sites More sharing options...
Keffer inc Posted July 8, 2015 Share Posted July 8, 2015 I had a leak on my evaporator inside the dash. But it sounded like it was at the expansion valve. Did a little soldiering and was good as new. Clean too since it was out of the dash for repairs. Quote Link to comment https://www.bigmacktrucks.com/topic/39993-97-ch-613-ac-system-leak/#findComment-296041 Share on other sites More sharing options...
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