AC vent temp... what should it be?
Thread Starter
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
AC vent temp... what should it be?
I have a 91 ZR1 that is stock. Texas is starting to get triple digits for the foreseeable future so cool AC is on my agenda.
Last year in the fall, I had the AC worked on replacing some parts and doing the correct 134a conversion. The system works and I can get 52 degrees out of the vent, but that feels like it should be colder. I chalked it up to cooler fall temps. I checked the FSM and I could not find a temp "Spec" on system pressures.
So, how cold the vent temp be blowing? I have one of those AC recharge kits and can give it a 134 shot if required. I did check the pressure on the gauge at it showed 45 which was in the middle of the green zone.
Last year in the fall, I had the AC worked on replacing some parts and doing the correct 134a conversion. The system works and I can get 52 degrees out of the vent, but that feels like it should be colder. I chalked it up to cooler fall temps. I checked the FSM and I could not find a temp "Spec" on system pressures.
So, how cold the vent temp be blowing? I have one of those AC recharge kits and can give it a 134 shot if required. I did check the pressure on the gauge at it showed 45 which was in the middle of the green zone.
Drifting
Joined: Jan 2005
Posts: 1,354
Likes: 325
From: San Antonio Tx
I found this on an automotive A/C web site.
For vehicles currently running with freon R-134a only
Outside-----low side-------High side------Center vent temp
60 F -----28-38 psi----130-190 psi ----44-46 F
70 F ------30-40 psi ---190-220 psi ----44-48 F
80 F ------30-40 psi ---190-220 psi ----43-48 F
90 F ------35-40 psi ---190-225 psi ----44-50 F
100 F -----40-50 psi ---200-250 psi ----52-60 F
110 F -----50-60 psi ---250-300 psi ----68-74 F
120 F -----55-65 psi ---320-350 psi ----70-75 F
_
For vehicles currently running with freon R-134a only
Outside-----low side-------High side------Center vent temp
60 F -----28-38 psi----130-190 psi ----44-46 F
70 F ------30-40 psi ---190-220 psi ----44-48 F
80 F ------30-40 psi ---190-220 psi ----43-48 F
90 F ------35-40 psi ---190-225 psi ----44-50 F
100 F -----40-50 psi ---200-250 psi ----52-60 F
110 F -----50-60 psi ---250-300 psi ----68-74 F
120 F -----55-65 psi ---320-350 psi ----70-75 F
_
Last edited by RWDsmoke; May 27, 2018 at 02:05 PM.
Thread Starter
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
I found this on an automotive A/C web site.
For vehicles currently running with freon R-134a only
Outside-----low side-------High side------Center vent temp
60 F -----28-38 psi----130-190 psi ----44-46 F
70 F ------30-40 psi ---190-220 psi ----44-48 F
80 F ------30-40 psi ---190-220 psi ----43-48 F
90 F ------35-40 psi ---190-225 psi ----44-50 F
100 F -----40-50 psi ---200-250 psi ----52-60 F
110 F -----50-60 psi ---250-300 psi ----68-74 F
120 F -----55-65 psi ---320-350 psi ----70-75 F
_
For vehicles currently running with freon R-134a only
Outside-----low side-------High side------Center vent temp
60 F -----28-38 psi----130-190 psi ----44-46 F
70 F ------30-40 psi ---190-220 psi ----44-48 F
80 F ------30-40 psi ---190-220 psi ----43-48 F
90 F ------35-40 psi ---190-225 psi ----44-50 F
100 F -----40-50 psi ---200-250 psi ----52-60 F
110 F -----50-60 psi ---250-300 psi ----68-74 F
120 F -----55-65 psi ---320-350 psi ----70-75 F
_
Thread Starter
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
So, with my little hand held AC charger, here is what I came up with
94 degrees out side
47 PSI on the low side with the built in meter
58 -60 degrees on the center vent with a thermometer
A little lower than I would like but probably "in zone" for a 134 conversion?
94 degrees out side
47 PSI on the low side with the built in meter
58 -60 degrees on the center vent with a thermometer
A little lower than I would like but probably "in zone" for a 134 conversion?
