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Pressures for 2004 Buick Century

Shepherd777 on Mon July 21, 2014 1:47 PM User is offlineView users profile

Year: 2004
Make: Buick
Model: Century
Engine Size: 3.1
Refrigerant Type: 134a
Ambient Temp: 82
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Hello all -

I'm doing the above car for my nice elderly next-door neighbors.

The pulp thermometer in the vent went down to 40 degrees when I first started the car, then after a minute or two, the vent temp went up to 60 degrees.

I tried to unscrew the plastic Schrader valve cover off one port and the entire valve assembly unscrewed and we lost all of the freon. So I did not get any pressures.

I put a drop of Loctite on the Schrader valve assembly and my next step is to evacuate the system.

If the freon was low, would the temps have gone down to 40 then climbed to 60 as they did?

I now need pressures please. Ambient is low-mid 80's.

Thanks.

GM Tech on Mon July 21, 2014 4:14 PM User is offline

You don't need pressures- you need refrigerant added by weight to the factory spec- then check your vents- are you happy with correct charge in the system?

You have a 65% chance you were low on refrigerant-- as 65% of what I work on comes to me with loss of refrigerant

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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 Mon July 21, 2014 4:14 PM User is offline

You don't need pressures- you need refrigerant added by weight to the factory spec- then check your vents- are you happy with correct charge in the system?

You have a 65% chance you were low on refrigerant-- as 65% of what I work on comes to me with loss of refrigerant

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

Shepherd777 on Mon July 21, 2014 8:20 PM User is offlineView users profile

Thanks GM Tech.

HECAT on Tue July 22, 2014 5:04 PM User is offline

I did not want to respond and sound like a butt head. Your pressures are 0/0.

Charge by weight. Pressures are for system performance diagnostics, which cannot be done until proper charge is installed.



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