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Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
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Hello, My 2004 C220 has a fault on the cabin heater, I have

Customer Question

My 2004 C220 has a fault on the cabin heater,
I have warm air on the RHS, but it is only cold on LHS.
The fan speed will slow down as I decrease the Temperature setting
but the air is ice cold.
The drivers side (RHS) is operating perfect.
Submitted: 3 years ago.
Category: Mercedes
Expert:  Shantal-Mod replied 3 years ago.

I'm Shantal and I'm a moderator for this topic.

We have been working with the Experts to try to help you with your question. Sometimes it may take a bit of time to find the right fit.

I was checking to see if you had already found your answer or if you still need assistance from one of the Experts.

Please let me know if you wish to continue waiting or if you would like for us to close your question?

Thank you,

Customer: replied 3 years ago.


To date I have not resolved my issue.

But I do need a solution asap.



Expert:  Shantal-Mod replied 3 years ago.
Hello Dominic,

Thank you for getting back to me. We will continue to look for a Professional to assist you.

Thank you for your patience,

Expert:  Stan replied 3 years ago.
The air temperature is controlled by heater core flaps. They are actuated by stepper-motors, which tend to break the plastic link to the flap. There is about a dozen of such flaps in total in the heat exchanger. Some are accessed only after the compet instrument panel is removed.
To localize the fault, i suggest to have the flaps tested by actuating them with Star Diagnosis computer. Some independent shops have this tool, besides dealer. Once the damaged flap is known- it will be clear if this can be repaired without removing the panel. After repairs, the 0-positions of the flaps must be re-calibrated with Star Diagnosis to avoid immediate breakage of plastic links.