A/C compressor control valve, no cold air?

Tiny
MM2TRADER007
  • MEMBER
  • 2013 CHEVROLET EQUINOX
  • 2.4L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 99,500 MILES
Still not getting cold air. I used a diag tool to test if the clutch comes on and I can see it turn on and off, then I test the low and hot fan and they came on, I drained all the pressure and filled up to 35-40 PSI on low and I believe the psi on high was at 250. The new diag tool I bought gave a code B393B-04. I believe it's the A/C compressor control valve. Does anyone have any diagrams and wiring pictures to help me if there's more to this after replacing or ways to test it?
Saturday, May 3rd, 2025 AT 1:37 PM

2 Replies

Tiny
MECHTRIX
  • MECHANIC
  • 112 POSTS
Okay, so when you drained the system did you leave in the oil and just drain the gas pressure because commonly Sometimes when people drain the system, they only drain the gas pressure and not the oil itself. Then when they go to refill it they fill it with the type of bottle that comes with oil mixed in with gas then they wind up with too much oil which can damage the system sometimes or at least cause it not to function normally. If there’s too much oil the pressure valve may not function properly obstructing the refrigerant from flowing through the system properly, so I always drain it completely of all oil and gas using a vacuum pump evacuation system and then refill it starting with negative 30 PSI pressure. Hope this helps, good luck.
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Saturday, May 3rd, 2025 AT 4:54 PM
Tiny
MECHTRIX
  • MECHANIC
  • 112 POSTS
If you’re sure the oil is the correct amount and the pressure is correct then while you’re looking you might want to test the wire connector at the pressure valve on the pump and if that checks out okay, then the pump itself or the TCM might be the problem. It’s hard to say but start with the simplest things first; like the oil level most systems only take a few ounces and it’s easy to go over the limit and create excess pressure. I’ve seen it damage pumps. Good luck
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Saturday, May 3rd, 2025 AT 5:14 PM

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