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Not Cooling Well

jtupper on Sat August 29, 2009 4:48 PM User is offlineView users profile

Year: 2000
Make: Chevy
Model: Tahoe
Engine Size: 5.3
Refrigerant Type: R-134A
Ambient Temp: 95
Pressure Low: ???
Pressure High: ???
Country of Origin: United States

I replaced compressor, accumulator, condenser, OT and TXV. I flushed the hoses and both evaps. I had it vacuumed and recharged. It's cooling but not like it used to. I'm going to get a set of gauges and get those readings tomorrow.

When I'm sitting at idle, the center vent temp is about 68° - 70°. When I get up to speed for a while it will get down to about 56°, but as soon as I stop it starts getting warmer. These temps are pretty consistent with the numbers I got from the file Tim sent with my order (95° with 60% humidity), but it cooled much better before I changed everything out. I suspect that it might be overcharged. The guy said he used 6 cans but he lost some because the low side service port was leaking at the cap.

I've also noticed that when I hit the a/c button on the controls, the compressor doesn't turn off. I never push that button so I can't honestly say that it wasn't already like that.

Cussboy on Sat August 29, 2009 7:42 PM User is offline

On I see where a 2000 Tahoe with dual air lists at 48 oz. R134a. 6 x 12oz. = 72 oz. to me. So that sounds like severe overcharged to me. I'd bet if you read both high and low pressures at 1500 rpm that both will read high. I'd have the refrigerant recovered (illegal to vent to the atmosphere), evacuuate the system, and add the correct amount by weight. And fix the valve while I had the refrigerant out.

"Some guy" used cans, most pros use 30 lb. containers.

TRB on Sat August 29, 2009 7:48 PM User is offlineView users profile

I would like to know what was the flushing procedure. Was the rear system flushed though the hoses or broken down and flushed as a single item?


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jtupper on Sun August 30, 2009 10:40 PM User is offlineView users profile

The hoses and evaporator were flushed separately. The evap was flushed from the connection where the TXV was and under the rear of the vehicle below the rear unit. I ended up having to have them replace the TXV. I couldn't get the darn thing out myself.

Unfortunately, I couldn't get a set of gauges on it today. Should I not run the a/c until I confirm that it's charged properly?

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