Mechanics

WHY NEW AC BLOWS WARM AIR?

1998 Saturn SW2 • 164,000 miles

Hi, I have 98 saturn sw2 with a 1.9ltr DOHC. I've had the car for 4 years and the a/c has never been good. I noticed the bearings were starting to go bad on the compressor so I went ahead and replaced the compressor, expansion valve, accumulator. And put in more oil and proper amount of r134a. I still have the same poor performance it won't get below 60 degrees on a cool day. And on hot day a can't even tell a difference. A friend told me since the compressor didn't internally fail it was'nt necessary to flush the system. I think thats were I went wrong. I even checked the ajustments on the cables to the blend door and vent control. Please help me im tired of sweating my but off.
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Tootall
April 11, 2012.



So you replaced the compressor because the bearing in the ac clutch went bad?When you replaced the compressor did you balance the oil charge in the new compressor?Meaning you dump out all the oil you can out of the old compressor. Then measure it. If you get little to no oil out of the old cmpressor then you put 2 ozs of oil back in the new compressor. Otherwise you put in whatever you get out of the old compressor oil amount wise back in the new compressor. Also was there oil in the compressor?That should have been drained before putting the new compressor on. Also you replaced the accumlator?Your talking about the drier right?If so that would be 2 ozs added to the a/c system for that. Then last but not least you replaced the expansion valve?So how much total oil did you put in the system when you repaired it?Also how many ozs of oil?How did you put in the oil in the system?Also how many ozs of charge did you put in?Did you pull a 45 min vacuum on the system before charging it with oil and r134?What are your high and low pressures at idle?Is your radiator fan running when the a/c is on?Have you checked for debris sand bags etc blocking the fins of the radiator and condensor?

Saturntech9
Apr 11, 2012.
Unfortunately I didn't measure the oil when I replaced the compressor, I did however put 1.5 oz. Of ice 32 and.5 oz of pag 100. I also put 2 oz. Directly into the filter dryer and another 2 oz. When I replaced the condenser and expansion valve. I did pull a vacuum on it and it failed, doesn't surprise me I'm been trying to find this darn leak for the last 2 summers now. I put 2 pounds of R134a in it to and 2oz. Of dye with no luck in finding the leak. Whats weird is that some leaks out but not all, about one quarter of refrigerant leaks out then stops leaking. High and low pressures are 110psi on high side, 35psi low side. My radiator fan does run when a/c is on. Radiator and condenser are clean.

Tiny
Tootall
Apr 25, 2013.
When you replace the ac compressor you have to balance the oil charge In it like I told you. Also you don't just add oil you add so much oil for each part changed and the amounts are different for each part. Also your over charging the ac it only holds 1.5Lbs not 2LBs. Have you checked the ac drain hole on the firewall for dye leaking out of it?

Saturntech9
Apr 25, 2013.