High and low pressure a/c port locations - The 1947 - Present Chevrolet & GMC Truck Message Board Network

92470 · 08-08-2007, 10:33 AM

Can anyone tell me which is the high pressure and which is the low pressure a/c ports on our trucks? Mine is a 71' Cheyenne with stock a/c.

Ports on the POA valve and a/c muffler but I'm not sure which is which?

Thanks in advance.

DennyB · 08-08-2007, 01:28 PM

The port on the muffler over the compressor is the high side.
The port nearest the firewal on the POA is the low side.

**john** · 08-08-2007, 01:29 PM

I dont have a truck to look at right now, but the high side will go from the A/C comp to the drier and condenser. The low side is usually a larger hose and returns from the evaporater to the condenser.

08-08-2007, 10:33 AM	#1
92470 Registered User Join Date: Nov 2006 Location: Maple Grove, MN Posts: 149	High and low pressure a/c port locations Can anyone tell me which is the high pressure and which is the low pressure a/c ports on our trucks? Mine is a 71' Cheyenne with stock a/c. Ports on the POA valve and a/c muffler but I'm not sure which is which? Thanks in advance.

08-08-2007, 01:28 PM	#2
DennyB Led Sled! Discs R 4 ME! Join Date: Jan 2001 Location: Toms River, NJ, USA (Transplanted Hoosier) Posts: 7,327	Re: High and low pressure a/c port locations The port on the muffler over the compressor is the high side. The port nearest the firewal on the POA is the low side. __________________ "Never ride faster than your Angel can fly" I.M.O.M,W,J&C Patriot Guard Rider Last edited by DennyB; 08-08-2007 at 01:29 PM.

08-08-2007, 01:29 PM	#3
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: High and low pressure a/c port locations I dont have a truck to look at right now, but the high side will go from the A/C comp to the drier and condenser. The low side is usually a larger hose and returns from the evaporater to the condenser. __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/



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