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sprinkles08
sprinkles08, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 21571
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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The air conditioner air is mixed with hot air, Yes look like

Customer Question

The air conditioner air is mixed with hot air
JA: Have you checked the coolant level? Have you checked the hoses for leaks?
Customer: Yes look like the driver side is blowing heat, and the passenger side comes cool.
JA: What is the model/year of your Mercedes?
Customer: Is a E320 2003
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I took it to a air repair and they replace the compressor. And still doesn't work.
JA: Anything else you think the mechanic should know?
Customer: They told me that they need to check the controls in the dashboard.
But they doesn't know what the problem is.
Submitted: 4 months ago.
Category: Mercedes
Expert:  sprinkles08 replied 4 months ago.

Hello and welcome to JustAnswer!

Depending on exactly what you're experiencing this may be an a/c performance issue or it could be a blend door problem. Poor ac performance causing one side of the evaporator to cool will cause a temperature difference between sides but if you're actually feeling heat from one side and cold on the other then it's going to be a blend door problem in the heater box.

Do you have dual zone controls?

Customer: replied 3 months ago.
I do
Customer: replied 3 months ago.
I replaced the temperature control,but still is blowing hot air at the driver side.
Expert:  sprinkles08 replied 3 months ago.

Was it the control head that you replaced?

Customer: replied 3 months ago.
I replaced the controls in the dashboard.
Customer: replied 3 months ago.
The Control panel
Expert:  sprinkles08 replied 3 months ago.

Does temperature on that side not change at all or does it just blow warmer with the a/c on?

Customer: replied 3 months ago.
since to work a little better when parking
Expert:  sprinkles08 replied 3 months ago.

Yes to which question? Does temperature not change at all, or does it just not blow as cold when on a/c?

Customer: replied 3 months ago.
The temperature don't change at all.
Expert:  sprinkles08 replied 3 months ago.

Have the blend door or actuator been checked? Has any actual testing been done?

Customer: replied 3 months ago.
When it happens, I to it to the mechanic , they replace the compressor and other parts , they charge my 1800$ .
According with them the problem was the control panel. Which I replaced, and still doesn't work.
Expert:  sprinkles08 replied 3 months ago.

The problem could be wiring but you almost surely either have a bad blend door actuator on that side or a broken blend door in the heater box, which would require dash and heater box removal to replace.