Automotive Air Conditioning Information Forum (Archives)

chade on Tue July 26, 2011 3:44 PM

Year: 89
Make: chevy
Model: blazer
Engine Size: 350
Refrigerant Type: R12
Country of Origin: United States

I bought this blazer with no compressor, however it was at one time converted to r134. My question is there was alot of metal in the OT when I disassembled the hoses from EVAP , besides flushing EVAP and condenser is there any thing else i should do before reassembling the system. I intend on using r12 again. Also is this condenser able to be flushed out or must it be replaced, if needs to be replaced is there a better than stock condenser to replace it with that is more efficient.

JJM on Tue July 26, 2011 10:45 PM

Condenser is a tube and fin, so it should flush fairly well with the right equipment (see HECAT), but you might want to consider replacement anyway. The stock condenser should be fine if sticking with R-12, but a parallel flow will give you the option of R-134a or even better R-12 performance. Don't be surprised if high side pressures are low with a parallel flow condenser and R-12.

Keep in mind that a parallel flow condenser is pretty much a throw away item after a system failure; it really cannot be flushed.

You should replace the OT, accumulator, O-rings, and any lines with mufflers or filters since those cannot be flushed. Because of the age of the vehicle, all the hoses should be replaced - the rubber is pretty much gone - especially on the high side.

Joe

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chade on Wed July 27, 2011 11:13 PM

So I went ahead and replaced everything in the system except the evap which I cleaned out with flush. Then vaccumed the system down for 2 hours checked the system no leaks and charged with r12 3.25 pounds as the sticker said. The systems blows 65 at the vents at idle, outside temp is 105F. The low side is 56 and highside is 325 any idea what is the problem. All the parts were new from the chevy dealer, no reman compressor

chade on Wed July 27, 2011 11:27 PM

I also forgot to mention I have replaced condensor, and radiator no bloockage there. The fan clutch was also just replaced so there is plenty of air flow. When driving down the street the temp in the vents drop to 60. I'm considering tearing the system apart and replacing the evap since this is the only part in the system that hasnt been replaced.