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Flush or don't flush?

tytonic on Thu May 07, 2009 1:02 PM User is offline

Year: 1998
Make: Chevy
Model: Blazer
Engine Size: 4.3L
Refrigerant Type: 134a
Country of Origin: United States

I finally got around to finding the leak in wife's Blazer. Luckily it's a simple replacement of the high side valve. My concern relates to the fact that the system has been empty for several months. Since the car is older and there has likely been moisture in the system, as long as the system is empty I figure I'll replace the accumulator. Since PAG oil can polymerize when exposed to moisture, I was wondering if it is also necessary to flush the system and replace the oil before I evacuate and recharge the system?

(I think I know the answer but I thought I'd check.)

TRB on Thu May 07, 2009 1:25 PM User is offlineView users profile

I would just replace the accumulator along with a little oil and pump it down very well before charging.


When considering your next auto A/C purchase, please consider the site that supports you:

HECAT on Thu May 07, 2009 3:13 PM User is offline

I agree with TRB, but if it is the original oil (11 years old); now may be the right time to flush it out and install some fresh oil. If you are not going to flush, follow TRB's advice and make sure you give some extra time to the vacuum process.


HECAT: You support the Forum when you consider for your a/c parts.


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