Question about 1990 Mercedes-Benz 300 Diesel
Fan blower on 1990 Mercedes 300sel will work when removed from the vehicle. Installed it apparently is getting no voltage. Suspect relay but I have not yet got my hands on a wiring diagram. Any suggestions please.
Check the blower fuse? check for voltage at the switch (requires removing heater / ac controls from dash on most vehicles.)
Posted on Apr 22, 2010
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Fig. Typical HVAC operation schematic
An inoperative blower motor could be caused by the following:
* Blown fuse(s). The fuse should be replaced. There may be both a LOW BLOWER and HIGH BLOWER fuse. Some models may also call it the HVAC fuse. Even the RADIO fuse is used in some applications. Check them all. If a fuse is blown there may be a short to ground in one of the power supply circuits.
* Open Circuit. Check the circuit between the ignition switch and the blower motor, and the blower motor ground circuit. Repair as necessary. * Faulty blower switch. A faulty blower switch should be replaced. * Most heater blower circuits also include a blower motor relay (look in the underdash convenience center), as well as a blow motor resistor. These items should be checked especially if the blower runs in one or two speeds, but not all speeds selected.
REMOVAL & INSTALLATION
Fig. Blower motor and fan assembly removal
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