Air Conditioning Not Cold on Mercedes-Benz ML320

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: 128,014 (29,956–201,000)
6 model years affected: 1998, 1999, 2000, 2001, more2002, 2003
36 people reported this problem
Viewing 1 - 15 of 15 comments
My ML320 was cooling fine on my way home when I would stop it would stop cooling hope it is just my coolant or a sensor gone bad
My air conditioner stopped working 3 years ago. My mechanic said it could cost $3-5k to replace. I just fork out $100 to have the freon put in each year. It gets me through a long California summer.
During the past couple of summers I have had to keep refrigerant in the trunk of the car because I can not tell when or where the leak is coming from but I have had to refill the ac at least twice a year because the coolant has leaked out.
Battery went dead, recharged now the AC only blows hot air, the dome lights do not work, the unlock the doors from the inside does not work All fuses are good. No fix as of yet, really need the AC !
Sometimes when you first get in and start up the car it can take up to a mile of driving to get the airconditioner to the point of blowing cold instead of cool air,