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Mercedes Benz AC Blower Issue
A blower motor is a combination of a motor and a fan that forces air through the vents into the passenger cabin. Its speed is controlled by a resistor. The blower motor is a part of the climate control system. In certain Mercedes models, there may be a problem with the blower, which does not react instantly after either the air conditioning or heating system have been engaged. In many cases, they will eventually engage, however randomly, or while driving on a bumpy surface.
The Mercedes types that are involved are from the CL (W 216 500, 600 and CL63) and S class (W221 500, 600, S63 AMG, S65 AMG and 550 4M). Mercedes officially claims that in most cases this particular problem is not caused by the electronic control system but by the blower itself.
To diagnose and fix the AC blower motor issue, please proceed as follows:
1. If you have the option to read the error codes, check for the error code 9516. If this one appears, there may be something wrong with the blower control unit, requiring it to be checked.
2. If the control unit seems to be working properly however, remove the dashboard's lower cover panel on the passenger side.
3. Now switch the blower on. If this doesn't engage, hit the bottom side of the blower housing with your hand. Should the blower react and engage now, it's the blower that's causing the problem. In this case the blower unit should be replaced completely.
4. If however, the blower does not react, and the error code 9516 does not appear either, then only the blower motor needs replacement.
The blower motor has part number A2218200514. According to Mercedes, diagnosing and fixing the problem shouldn't take more than 1.5 hours.
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