Posted by Steve@Advance on August 01, 2016 at 19:00:14 from (107.203.134.67):
Saturday I posted about an AC problem on my 2013 Silverado. This truck is new to me, so don't know the history of the AC problem. Apparently the previous owner had been having problems, assumed a leak as it has die in it. I had tried adjusting the charge, ended up over charging it.
Today I took the charge out, vacuumed the system for an hour, recharged 25oz by weight per capacity label.
The pressures are now correct, at least they were in the air conditioned shop where it was 75*. The return line is sweaty cold. The compressor is cycling as it should. Time will tell if there is a leak. At this point I don't think there is a leak, never could see anything with the UV light.
Now I think I am back to the original problem. The air is cool, but not cold. It seems "thready", as if warm air is being intermittently blended with the cold. I don't think it is the cycling switch, it is too sudden and irregular. Sometimes it is quite cold, then a second later it is back to just cool. Thinking there is something up with the blend door or the actuator. Maybe something has fallen down the defrost and is jamming it, something loose, something broken...
It will go through all the motions, dash, floor, defrost, hot, cold. Just something is not quite right. But for now it's working better, I'll dive into it another day. Any ideas? Typical problems with this model?
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