A/C issues

[Don Nguyen]

The A/C had gone out of my E70, so I had the compressor replaced. Even after replacing the compressor, the car is not blowing cold air. I've had both an independent shop and the dealership look at the car, and they haven't been able to find the exact issue with the car yet.


This is what I had done at the independent shop:
Replace AC compressor
Reset everything - gets signal readings at AC compressor
Freon added to specifications


This is what the dealer told me :
AC compressor is not getting signal (which is opposite of what the independent shop told me)
They wanted to change out the engine harness and redo some of the chassis harness in the rear of the car, because they saw some water corrosion on the wires (wanted $2700 to do this)


I am thinking it may be an obscure/random issue, so I am wondering if anyone on here has any possible ideas that I should consider checking out?

[brutal5]

My 2010 4.8 had same issue recently. The clutch went bad, instead of replacing only the clutch I replaced the compressor (complete with clutch),
receiver drier, o-rings. PITA!! Weighed in the correct amount of refrigerant and about 2.5 pag compressor oil. I could only get 56 degrees on either side of the car which really made me crazy. The compressor also came with a new txv which requires removing the dash, no way that was happening.
Long story short, the additional problem was the heater control valve, easy to change and holy crap!!! 36 degree air.



Check the temp on the driver and passenger side separately, if there is as much as a 5 degree difference you probably have a bad heater control valve.
I"m a commercial HVAC engineer by trade by the way. This wasn't as fun as I thought. I actually purchased the compressor kit from amazon of all places and couldn't be happier!! $284.95 Not Bad...


Also I didn't do any programing at all.

[80stech]

Find another shop.