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Where is the heater fan relay for a 993 Mercedes Benz 300 e and how do you fix it?
Wiki User
∙ 14y ago
The blower motor control unit is located on the back of the blower motor.
1. Check fuse.
2. Turn on heat and check for voltage at blower motor. Found voltage replace blower.
3. Check for supply power from the fuse on the red wire going to the blower control unit.
4. Check for a good ground on the black wire on the control unit.
5. Check for control power on the yellow wire from the climate control unit. When you select a fan speed (or the unit selects a speed in auto mode) a voltage that ranges from .4 - 9 volts is sent down the yellow wire to the blower motor control unit.
6. If all these checks are good than change the blower motor control unit.
Hope this helps.
Wiki User
∙ 14y ago
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