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High - Low Pressures for 1993 Cad STS

Bob B on Wed July 22, 2009 1:57 PM User is offline

Year: 1993
Make: Cadillac
Model: Seville
Engine Size: 4.6L
Refrigerant Type: R12
Country of Origin: United States

Can any one tell me what are the high and low side pressures for a 1993 Cad Seville STS using R12 refrigerant?

Thanks,
Bob B

GM Tech on Wed July 22, 2009 3:11 PM User is offline

You will tell us your pressures when you attach your gage set- there are all sorts of variables, like ambient temp, blower speed, engine rpm, inside/outside air source- the best thing to do is to weigh in your charge from an empty system, then no pressures are needed- as long as it is cooling and pressures don't go to extremes in either direction.

In short, at 80 degf ambient at idle on high blower, outside air- somewhere around 30 psi low and 200 high would be considered normal...but there can be all kinds of variation depending on the above mentioned variables.

-------------------------
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......

Bob B on Wed July 22, 2009 3:53 PM User is offline

I haven't put the gages on yet but plan on checking the car out after the weekend. I suspect that I have lost refrigerant over the last 6 years since the last time it was serviced. At idle, it seems to cool best, but not cold enough (about 60 F). As soon as rpm increases during driving, the cool air turns warmer. It has progressively gotten worse over the past couple of years. There was a point when it would get colder with rpm increase.
There was dye put into the system during the last service, so I will check for leaks.
When I do check it out with the gage set, the ambient temp will be about 85 F. I will place the blower on maximum and bring the rpm up to about 1800.

Thanks,
Bob B

GM Tech on Wed July 22, 2009 4:07 PM User is offline

Those caddys usually tell you when they lost too much refrigerant- as in "service a/c soon" message - or "service a/c very soon" message.

Have you not had that yet? They will disable compressor, to save the compressor...

-------------------------
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......

Bob B on Wed July 22, 2009 6:08 PM User is offline

No service a/c message yet.

Thanks,
Bob

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