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PAG46 or PAG150

glenhart on Mon April 11, 2011 3:43 PM User is offline

Year: 2004
Make: chevrolet
Model: Impala
Engine Size: 3.4L
Refrigerant Type: R134a
Country of Origin: United States

What is the correct PAG oil for my 2004 Impala? The NAPA capacity guide online says PAG150 and the NAPA store said its books said it should be PAG46. The salesperson said he could not explain the difference, but he was pretty sure it was PAG46. The compressor is a Delphi with the number 6562128 on it. Also what should be the HI and Low manifold gauge readings, at various ambient temps, when it is working right?

GM Tech on Mon April 11, 2011 4:06 PM User is offline

GM spec is part number 12378526 for the oil

A simple Google search of that part number tells you it is PAG 46

Your variable stroke compressor should maintain suction at around 25-32 psi - as long as ambient is not too hot- and discharge can vary depending on numerous things, like fan speed, condenser air flow, ambient.......

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......

Edited: Mon April 11, 2011 at 4:09 PM by GM Tech

glenhart on Mon April 11, 2011 8:09 PM User is offline

Thank you very much. One more question. As I am going to be replacing the condenser and receiver/drier and complete vacuum, I have a question about adding the R134a. The system holds 37 oz. so using 12 oz cans and a 3 oz dye can, how do I come up with 37 oz. Do I use 2 12 oz. then 3 oz dye, then try to guess where to stop getting the 10 oz. out of the last 12 oz can? Do you have a better suggestion. Thank you.

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