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DBAutomotive, Mercedes Technician
Category: Mercedes
Satisfied Customers: 126
Experience:  8 years experience as automotive technician, Mercedes-Benz Master Certified Technician
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ML350: My 2004 Mercedes ML350 AC does not blow cool air. Some

Customer Question

My 2004 Mercedes ML350 AC does not blow cool air. Some days it does and sometimes it will not. The compressor is only 6 months old.
Submitted: 2 years ago.
Category: Mercedes
Expert:  DBAutomotive replied 2 years ago.
Hello and welcome to Just Answer. My name is ***** ***** have access to A/C gauges or an A/C machine? Do you know if the fan comes on? Can you hear the A/C compressor cycling on and off? Is it on warmer days that the A/C doesn't seem to work?
Customer: replied 2 years ago.
No, I don't have access to a machine. The two fans are not moving.
Customer: replied 2 years ago.
What can be the reason for the AC fans not moving?
Expert:  DBAutomotive replied 2 years ago.
The fans are controlled through an All Activity Module - AAM. That is located in the same area as the fuse box under the hood. It can be as simple as a blown fuse or the fans or could be a number of other issues. It all depends on where the line of communication is dropped. If the AAM is telling the fans to turn on and they won't move then the fuse and fans should be tested to see why they won't turn on. If the modules isn't sending a signal to the fans to turn on then testing needs to be done to figure out if the module has everything it needs or if something is interfering with it. Other than checking the fuses for the AAM, fans, engine comupter this is more and more of a situation where there are a lot of inputs that need to be monitored or tested for. A wiring schematic and a DVOM (volt meter) would be necessary to continue diagnosis.
Customer: replied 2 years ago.
Ok, I will check that out
Expert:  DBAutomotive replied 2 years ago.
Alright. Sounds good. Let me know if I can offer further assistance.