good a/c temp - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mtdave2 · 09-01-2002, 12:39 AM

what are you guys running for temp on the air comming in from your vent?? those of you with a/c that is. whats normal?

mtdave2 · 09-01-2002, 12:24 PM

noone knows?

dmec · 09-01-2002, 01:45 PM

mine is 48 deg. depends on outside temp. when over 100 deg vent is around 50 to 52 deg. im using an accumulator system with r134. used all original a/c system but replaced evaporator with a later model truck evaporator set up for cycling cluth system.

**ThreeQuarter** · 09-01-2002, 03:21 PM

Dave, a really good temp to have coming out of your vents is in the low-mid forties. I've achieved that on late-model pickups, but don't know how easy it would be to get that number on ours. And yeah, it'll go up considerably if it's really hot outside.

mx jim · 09-01-2002, 08:53 PM

The best way to tell if you are getting a good efficient system is when the air coming out of the register is 20-25 degrees colder then the air recirculating back to the evaporator. This will reach a maximum temp that will be about 45-50 degree supply air temp. At a suction pressure of 32 lbs the gas temp is at about 32 degrees and the losss through the coil will get you about 42 degree air. Good luck these are just rough figures. Ed ke6bnl

billogna · 09-01-2002, 11:39 PM

Mine is 45 deg @2000 rpm, and about 53 @idle, with about 95 deg outside temp. I'm using all original parts except for 134A and ditching the POA valve in favor a clutch cycling switch version from Old Air Products.

09-01-2002, 12:39 AM	#1
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	good a/c temp what are you guys running for temp on the air comming in from your vent?? those of you with a/c that is. whats normal? __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-01-2002, 12:24 PM	#2
mtdave2 newly minted old timer Join Date: Dec 1999 Location: Hudson WI Posts: 3,521	noone knows? __________________ ____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban

09-01-2002, 03:21 PM	#4
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,522	Dave, a really good temp to have coming out of your vents is in the low-mid forties. I've achieved that on late-model pickups, but don't know how easy it would be to get that number on ours. And yeah, it'll go up considerably if it's really hot outside. __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

09-01-2002, 08:53 PM	#5
mx jim Registered User Join Date: Mar 2002 Location: agua dulce CA USA Posts: 35	The best way to tell if you are getting a good efficient system is when the air coming out of the register is 20-25 degrees colder then the air recirculating back to the evaporator. This will reach a maximum temp that will be about 45-50 degree supply air temp. At a suction pressure of 32 lbs the gas temp is at about 32 degrees and the losss through the coil will get you about 42 degree air. Good luck these are just rough figures. Ed ke6bnl __________________ mxjim 1970 chevy 4x4, 400 small block, 4" pro comp lift, with 35s.

09-01-2002, 11:39 PM	#6
billogna Registered User Join Date: Apr 2002 Location: Choctaw, OK Posts: 235	Mine is 45 deg @2000 rpm, and about 53 @idle, with about 95 deg outside temp. I'm using all original parts except for 134A and ditching the POA valve in favor a clutch cycling switch version from Old Air Products. __________________ '69 Chev Cust/10 swb, 350/700R4, 5"/6" '70 Chev C10 swb, 67 front, 454/700r4, 4"/5" '73 Chev stepper, 350/3 spd '84 Chev K20 350/4 spd '91 GMC 1500 Suburban 4x4, 350/700R4

09-01-2002, 01:45 PM	#3
dmec Senior Member Join Date: Jun 2000 Location: yucaipa ca Posts: 580	mine is 48 deg. depends on outside temp. when over 100 deg vent is around 50 to 52 deg. im using an accumulator system with r134. used all original a/c system but replaced evaporator with a later model truck evaporator set up for cycling cluth system.



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