2001 Mercedes Benz E430

2001 Mercedes Benz E430 V8 Automatic 79000 miles

Air Coditioning- Cold air blows ok on the passenger side. The driver side the air is hot and seems to blow air from outside (not the heater).
One HVAC shop told me the Freon pressure was OK and go to the dealer.
The dealer told me that the problem is " low freon pressure". Needs to be completely evacuated and refilled.
Since the car has only one cooling coil, I do not believe the problem is due to low freon.

Any ideas?
May 30, 2010.

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