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Mercedes-Benz Master
1,619 Answers
- Posted on Oct 21, 2010
Re: Ac blows cold air for about 15 minutes then starts...
Freon is not full. If it goes back and fourth it is pumping then reaching a low pressure on the low side below 35 psi. Pressure while car is off should be pegged. Check at idle should be around 50 psi and 35 psi at 2000 rpms.
Good luck. If problem persists evac system replace dryer and recharge.
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