Im working on my mother in laws 2001 Tahoe. Rear air. The A/C quit working a while back. It was low on freon, leaking out of the high pressure port (the rubber was rotten). Replaced with a schrader valve style, replaced dryer and pulled it down no issue. Its not acting correctly on the recharge. I've got about 1.5 lb in it and the low side is 60 high side 270. Is the compressor junk? If not, what else could be causing this? Its also showing 20 lb higher on the high side static with the compressor off.
A/C Help
- Thread starter ADub
- Start date
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mizzouguy
Full Access Member
Plugged orifice tube? That high side is way high, and difference on static points to something being blocked. Considering the high port and low port are only about 12" apart in the same line, and the orifice tube is the only thing between them, I'd check it first.
I should have mentioned that I did check the orifice tube. Its clean, no blockage on the screen, but you cant really see down into the orifice
mizzouguy
Full Access Member
The fact that it holds 2.7 lbs of r-134 and its already that high on the high side is weird. Maybe someone else has an idea. I'd still think blockage, maybe try some of that flush stuff through the condenser?
The compressor is pumping so it's not junk. If the valves were bad you'd have high suction and low discharge.
Is the liquid line hot? It should be at 270 that's high for 134a. Try fans in front of condenser. That's the only way I could top mine off properly.
If there was a restriction on the high side then the suction pressure should be low.
I'm assuming you're using the small cans? I know someone who charged 134 as a vapor from 30lb drum. It didnt work. 134 is a blend and needs to be liquid charged.
So the expansion valve was stuck closed. After replacing that, the compressor acted normal for a dying compressor, minimal high side pressure build. I ran out of town to replace it before she left town. Waiting for her to take to a shop
