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Hello Tony, so the amount of air that comes out of the vents does not change, it is just a temperature problem?
The airstream is OK . It is just temperature of the air gets colder the more the car is revving/moving and decreases at stop or idling.
Okay. You need to get a real set of gauges to hook to the vehicle. You need to check the pressures. It sounds like you have a bad compressor.
2003 Jetta left rear window blue plastic part of the