my heater blows hot on the passenger side and cold on the drivers side. what could be the cause?

 

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Profile picture for user MercedesMedic

The problem could be the duo valve but if I remember correctly the W203 may not have one. The next possbile issue is the vent acuators that direct the air flow. They can get stuck or break.

Do you hear a click click click noise under the dash when you first start the car?

Profile picture for user joecounts

thanks. someone said it might be low on freon but i don't

see how that would effect one side and not the other

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