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  • March 28, 2024, 01:43:45 PM

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Author Topic: AC press readings and temp from vents  (Read 3827 times)

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Offline marty

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AC press readings and temp from vents
« on: March 15, 2016, 11:39:26 PM »
Anyone know what the low and high press readings should be w R12 in the system (I have R12 compatible HC12)?  Also, what should the temp be from the vents (I'm getting about 52 F w my IR temp sensor).

Offline eaglebeek

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Re: AC press readings and temp from vents
« Reply #1 on: March 16, 2016, 07:57:23 AM »
There are many factors that affect pressures...outside air temperature, inside-the-car temperature, engine speed, etc....that it would be difficult to say exactly what pressures are correct. As a general rule of thumb the high pressure side should be 7-10 times low side pressure. Example: if low side pressure is 30psi high side pressure should be 210-300psi.

IR thermometers are difficult for gauging air temperature. Instead they try to gauge the temperature of surrounding objects. Using a mechanical thermometer  held at the center duct you should get 42 degrees or less with the car closed up and the engine running at a fast idle...somewhere around 1,000rpm.
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Offline marty

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Re: AC press readings and temp from vents
« Reply #2 on: March 16, 2016, 04:17:46 PM »
Hmm, will try the regular thermometer.  I was running about 30 psi on the low side and about 150psi on the high side, outside air temp in the low 80's.

Offline rmick

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Re: AC press readings and temp from vents
« Reply #3 on: March 16, 2016, 11:30:49 PM »
Those pressures are about right for R12. You should also get about a 15-20 degree drop in temperature across the evaporator. the inlet side as apposed the the outlet temperature
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Offline JayRamb

  • ELLA THE EAGLE & EDWIN THE EAGLE
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Re: AC press readings and temp from vents
« Reply #4 on: March 17, 2016, 09:38:01 PM »
Where can one find an R-12 valve to the can to the AC compressor?!

I FOUND ONE ON EBAY!!! YAY!!
« Last Edit: March 17, 2016, 10:10:01 PM by JayRamb »
Jayson H.
Best HWY Mileage of 87 Eagle:  26.2 MPG

Believer in AMSOIL & Seafoam
1987 Garnet Red Eagle Wagon: 70,500 miles
1967 Rambler Rebel 4 Door 290 V8 (original family car) Marina Aqua 142K miles
1985 Eagle Wagon in Autumn Brown 74,800 miles as my daily driver
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Offline macdude443

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Re: AC press readings and temp from vents
« Reply #5 on: March 24, 2016, 02:54:39 PM »
When I had my R12 recharged last summer, with true R12, the shop read 39* at the vents on a 75* day.
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Offline JayRamb

  • ELLA THE EAGLE & EDWIN THE EAGLE
  • Eagle Sundaancer
  • ******
  • Posts: 946
  • Thumbs Up 30
  • AMC passion for over 32 years. BIG advocate!
    • UPDATED!!  1967 Rambler Rebel weebly website
Re: AC press readings and temp from vents
« Reply #6 on: March 24, 2016, 03:03:50 PM »
Found one on eBay!!! Yay!!
Jayson H.
Best HWY Mileage of 87 Eagle:  26.2 MPG

Believer in AMSOIL & Seafoam
1987 Garnet Red Eagle Wagon: 70,500 miles
1967 Rambler Rebel 4 Door 290 V8 (original family car) Marina Aqua 142K miles
1985 Eagle Wagon in Autumn Brown 74,800 miles as my daily driver
SOLD 1984 Black Eagle Limited w/Tach & gauge cluster: 245,100 miles SOLD

 

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