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
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Average mileage: 128,014 (29,956–201,000)
6 model years affected: 1998, 1999, 2000, 2001, more2002, 2003
33 people reported this problem
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Viewing 1 - 15 of 15 comments
My AC stop working. It is blowing air but it is not cooling. I replaced blown fuse still is not working.
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
we had our mechanic refill freeion 3x for the last 6 months. it doesnt work again.
Haven't got it fixed. Was quoted replace evaporator -- over 20 hours labor plus part! Around $2000
AC doesn't get very cold
ac clutch will not engage just have hot air no ac
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.
poor cooling, did not know why, took to Goltz motors, a specialist. replaced compressor...
A/c needs to be recharged with stop leak refrigerant and new freon every year.
Keeping it charged properly helps a great deal.
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 !
leaks free on
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,