2017 VW Jetta SE TSI
A/C works only intermittently. When it does work it blows cold when it doesn’t it will blow hot/warm air.
Switch? Relay? Compressor?
Tks
NAVRET
What are the system pressures? Is the condenser fan working? Is your blend door working properly? Are there any codes related to the HVAC system?
A lot of VW owners share that same complaint: My AC works great. Then it stops working. Then it works great again.....
VW uses a clutchless compressor. Instead of the clutch, the compressor has an A/C Compressor Control Solenoid Valve. When these are faulty they cause the symptoms you're describing.
Like @chucktobias just told you, it's time to hook a set of A/C gauges to it. If it's the solenoid valve (or another issue) you'll see it on the gauges. Probably a little higher than normal psi on the Low Pressure Side.
On some VWs you don't have to remove the compressor to get to it. On some you have to remove a shield. On some you have to remove the compressor.
In any case, the refrigerant has to be removed to replace the solenoid valve.
It goes here:
It looks like this:
