Air2Air

Any ideas would be appreciated. I am a mechanic so I know a little about vehicles but this has me stumped. I have a 2014 Silverado with 177k. The truck is well taken care of and doesn’t have any of the issues common to these models. About a months ago I noticed my a/c wasn’t as cold as it normally runs but it’s not been terribly hot so I didn’t think much about it. Now that it’s hot I really need it. It’s not blowing hot air but more ambient temp air. I took it to a local shop and they did a Freon recovery, vacuum check and refill. It was a tad low but not enough to effect cooling. Here’s a list of what we’ve checked: A/C system pressure good (according to mechanic) Compressor functioning properly Blower fan good A/C control head unit functioning properly All blend doors functioning properly Here’s what we’ve found so far that may be the culprit: Scan tool found codes U1509 and U0020 Engine cooling fans not cutting on when compressor engages I have found little info on those codes but a U1509 could be a A/C control module. I’m curious if this could be as simple as a stuck expansion valve or system blockage or if it’s more of the sparky gremlins from GM. I’m heading out now to retest the pressures and see if possibly it’s a TXV and do a hot water test on it. Will keep you posted. UPDATE: I used my own gauges and rechecked the pressures. After letting the engine warm to operating temp my low pressure side was reading 60 psi and my high side was reading 60 psi. I let the system run for about 45 minutes and the low side increased to 75 psi and high side remained at about 65-70 psi. I then used a heat gun to heat the TXV and the low side pressure would drop to about 68 psi and then slowly rise to 75 psi when heat was removed. High side would creep up to about 85 psi and hold steady. The engine cooling fans never cut on and engine temp held steady at 210 degrees. Outside air temp is approx. 60 degrees.