Automotive Air Conditioning Information Forum (Archives)

GMP440 on Mon June 15, 2015 11:02 PM

Year: 1997
Make: Buick
Model: Regal
Engine Size: 3.8
Refrigerant Type: R-134
Country of Origin: United States

Hello,

Does anyone know the low and high side pressures for a 97 Buick Regal LS with dual air conditioning?
I am in South Florida and the temps get anywhere from 80 - 90 farhenheit. Thanks.

George

GM Tech on Tue June 16, 2015 10:16 AM

Varies according to load-- normally the control valve tries to hold at 27-32 psi low side if 80 degrees or lower--high side depends on cooling fan speeds-low fan kicks on at around 175psi and high fan near 275 psi--if hotter than 80, then low side can go up accordingly-- the on ly way to know is to be sure the specified refrigerant charge amount is in the system- extract and weigh it to be sure-- V-5 compressors are know for shaft seal leaks and belly leaks.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

GM Tech on Tue June 16, 2015 10:16 AM

Varies according to load-- normally the control valve tries to hold at 27-32 psi low side if 80 degrees or lower--high side depends on cooling fan speeds-low fan kicks on at around 175psi and high fan near 275 psi--if hotter than 80, then low side can go up accordingly-- the on ly way to know is to be sure the specified refrigerant charge amount is in the system- extract and weigh it to be sure-- V-5 compressors are know for shaft seal leaks and belly leaks.

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......