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Discussion Starter · #1 · (Edited)
Help! AC Pressures 2002 Wagon SE 3.0 Vulcan?

Help! I'm burning up in Memphis! Can someone please tell me the AC high and low pressure values for the 2002 Wagon SE, 3.0 Vulcan, both static and running?
;) Many thanks, wjs
 

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It totally depends on ambient temperature.
My experience is low port P=50 psi in 2:00pm, high port P=300 psi (T=100F),
low port P=35 psi in 7:00pm, high port P=240 psi (T=80F)

So it's really hard to say what pressure is appropriate, just put
as more R134-a as you can until it feels cold.


Help! I'm burning up in Memphis! Can someone please tell me the AC high and low pressure values for the 2002 Wagon SE, 3.0 Vulcan, both static and running?
;) Many thanks, wjs
 

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Rule of thumb with R134a, subtract 50 from the ambient temperature outside, and that should be your low side pressure :) Give or take a few lbs. If it is constantly going up and down, or is not blowing cold, or whining, you need to evacuate the system with a vaccum pump, change the dryer / accumulator, re-evacuate the system, and recharge with oil and uncontaminated refrigerant.
 

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Chart

Found this chart:
R134 a
ambient t low side charge high side charge
65F ******25-35psi********135-150psi
75 ****** 35-45**********150-170
85 ****** 45-55**********225-250
95 ****** 50-55**********275-300
105 ******50-55**********340-345
 
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