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Hi, welcome to Just Answer. My name is***** sounds like a fault with the actuators for the mode doors in the dash. Everything is controlled electronically. You should get the car connected to the Mercedes Star Diagnosis tester to have a diagnostic test performed on the actuators. Any faulty or sticking actuators will store a fault code in the computer. Replacing the actuators can be expensive so I suggest that you have the car checked before you purchase it. It is a good idea to have the entire vehicle inspected by a Mercedes technician prior to making your decision.
Let me know if you have any questions.
Hi, aside from the actuators the only other possibilities are the control unit itself or one of the sensors in the system or low refrigerant in the system. During a normal pre-purchase inspection the technician should connect the Mercedes tester and scan every module in the vehicle for fault codes. The codes will tell the technician where the problem lies. At this point he will have a fairly good idea as to the problem. I normally advise my customer's to negotiate the repair into the purchase price of the car or have the seller repair the problem before you buy it.
Let me know if you need anything else.
Low refrigerant could cause the compressor not to turn on immediately. I'm wondering if the air would eventually turn on all by itself if you didn't touch anything. If it won't then I would say that the problem is with the climate control or the actuators. The fault codes stored in the climate control will point to the problem.
Yes I can help you with the E320 but you are supposed to open a new question for different vehicles. If you want to rate my service on this question and start a new one on the E320 I will be glad to help you. Just be sure that you request me when you open the question.
I've seen a bad compressor act that way.
In regards ***** ***** whining I would suspect a noise from the differential. When the differential gets noisy it makes a whining sound. It usually goes away when you back off the throttle. Tires can make a whining noise also but it's usually all the time.
Okay, then it's definitely not the differential. Possibly a transmission fluid whine. A fluid and filter change might help. Power steering can whine like that also.
Normally you would associate a power steering noise with turning the wheel. Without the benefit of hearing the noise it is hard to say what it is. I'm inclined to think it a transmission whine or a whine from one of the belt driven components.
The key preference is overridden as soon as you press a button on the climate control unit. That won't be the problem here.
On the transmission I prefer replacing the filter and fluid over flushing the transmission.
It would not be consistent because you have to play with the buttons. For example, if the climate control comes on and is set at 65° cooling it should cool at 65° as soon as you press the Auto button.
A 2004 did not have key memory for the climate control. This car simply remembers the previous settings of the seats and climate control.