'05 TL. The A/C started acting up. It works the first 10 minutes of the drive, but then blows like it was on vent never recovering until I park it. It doesn't matter if I turn the AC on and off and all the control options inside the vehicle. I replaced the relay and nothing changed. I put some gauges on it and the pressures are a bit low (i think). It's 95F outside and I am reading 40 PSI on the Low side and 180 PSI on the High side.
I'm not sure if the evaporator is freezing up or not. Is there a good way to determine if it's freezing or not? I checked the cabin air filter and it was pretty dirty. I haven't changed that yet.
What are my next steps to troubleshoot? When the clutch is not engaging but should be - do I check the pressure sensor voltage? If it's a clutch field coil malfunctioning, would it be so consistent with working in the first 10 minutes?
I'm not sure if the evaporator is freezing up or not. Is there a good way to determine if it's freezing or not? I checked the cabin air filter and it was pretty dirty. I haven't changed that yet.
What are my next steps to troubleshoot? When the clutch is not engaging but should be - do I check the pressure sensor voltage? If it's a clutch field coil malfunctioning, would it be so consistent with working in the first 10 minutes?