Another AC question? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

myyamr7 · 07-27-2013, 12:59 PM

I recently had my AC charged up, new compressor, all new lines, and I found a local shop with some R12 to charge it. The AC works and is ice cold, but if I drive for about an hour or so with it on, it starts to get a little warm inside the truck. I opened the hood when I got home, and the big return line had a good layer of frost/ice on it. By looking at the water flowing from my ac/heater box shortly after, I'm getting the part inside there was frozen as well?

Any ideas what it is before I bring it back to the guy?
Thanks

**truckdude239** · 07-27-2013, 01:44 PM

Low of freon or the expansion cable/metering device is bad
Posted via Mobile Device

mmiddle · 07-27-2013, 04:29 PM

2x

**Steeveedee** · 07-27-2013, 09:38 PM

Possibly the POA valve may be sticky and needs attention. An alternative is to temper the AC with a little heat to melt the ice. You can do that with a little move of the heat lever. If it's ice cold, dialing in a little heat could do the trick, and won't drive you out of the cab. Look at the view port on the receiver-dryer to see if there are any bubbles. If there are no bubbles, you likely still have a full charge. I have seen this on brand new cars and trucks, when I worked for a Chevrolet (well, actually two different ones) dealer in the early '70s.

07-27-2013, 12:59 PM	#1
myyamr7 Registered User Join Date: Dec 2012 Location: Providence, RI Posts: 211	Another AC question? I recently had my AC charged up, new compressor, all new lines, and I found a local shop with some R12 to charge it. The AC works and is ice cold, but if I drive for about an hour or so with it on, it starts to get a little warm inside the truck. I opened the hood when I got home, and the big return line had a good layer of frost/ice on it. By looking at the water flowing from my ac/heater box shortly after, I'm getting the part inside there was frozen as well? Any ideas what it is before I bring it back to the guy? Thanks __________________ Mark 71 C10 Cheyenne 12 Aprilia RSV4

07-27-2013, 01:44 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,238	Re: Another AC question? Low of freon or the expansion cable/metering device is bad Posted via Mobile Device __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

07-27-2013, 04:29 PM	#3
mmiddle Registered User Join Date: Jul 2013 Location: Forestburg, Texas Posts: 659	Re: Another AC question? 2x __________________ Mark Jesus is the Way! 2003 2500HD CCLB Duramax/Ali (Clifford) 2014 2SS/RS black on black Camaro (Betty) 2006 Pontiac SOLSTICE silver/black (Lula-Bell) 1970 C/10 Short Wide (Peggy) 1964 C/10 Short Step (Hambone) RIP Jimmy Hamilton Thank you for the trucks

07-27-2013, 09:38 PM	#4
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,710	Re: Another AC question? Possibly the POA valve may be sticky and needs attention. An alternative is to temper the AC with a little heat to melt the ice. You can do that with a little move of the heat lever. If it's ice cold, dialing in a little heat could do the trick, and won't drive you out of the cab. Look at the view port on the receiver-dryer to see if there are any bubbles. If there are no bubbles, you likely still have a full charge. I have seen this on brand new cars and trucks, when I worked for a Chevrolet (well, actually two different ones) dealer in the early '70s. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA



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