Air Conditioning Not Cold on Mercedes-Benz ML350

Problem Description and Possible Solution

AC system leaks and/or a faulty evaporator temperature sensor can cause poor AC cooling. The failed sensor can prevent the AC compressor from coming on. Leaks cause a low refrigerant level, which reduces the ability to cool.

Problem Data
RepairPal Verified
Average mileage: 94,754 (60,000–137,099)
4 model years affected: 2003, 2004, 2005, 2013
12 people reported this problem
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At times when i on the A/C system it will work fine and if i move for about 4km it will stop working and at times it will not stop working by not cooling, only blowing air.
I have had this issue looked at, was charged almost $400 and it's still not fixed. My a/c won't blow out cool air. It is lukewarm and the shop that worked on it said that it needed to be vacuumed out. Then I took it back less than a week later, and they said that it could be a bigger problem and it would cost me another $500. I haven't gone back because that would be almost $1000 on getting this fixed. I don't even know how much this is supposed to cost because the dealer is quoting me outrageous prices, which is why I went to the other shop in the 1st place. My car is a 2006 ml350.