FiremarshalBill49 Posted April 11, 2018 Report Share Posted April 11, 2018 The heater on my 72' works okay, but the fan switch only functions in the High position (pulled all the way out). Is this problem (no low speed fan function) typically in the switch itself or somewhere in the wiring? 1 Quote Link to comment
hobospyder Posted April 11, 2018 Report Share Posted April 11, 2018 Theres a thread somewhere that explains how to fix this. Ummm..... fan switch resistor or something Someone should be by shortly 2 Quote Link to comment
Dolomite Posted April 11, 2018 Report Share Posted April 11, 2018 Realizing this is in the truck section, I needed to rethink and edit. Having only one speed is probably caused by a break in the resistor coil in the fan box. Look for breaks in the coil, they can be soldered or even twisted together to regain continuity. It could also be corroded tabs or connectors. Quote Link to comment
datzenmike Posted April 11, 2018 Report Share Posted April 11, 2018 Power goes to the fan motor, then you select different resistances to ground for the different speeds. Well that's how the Datsuns work, don't know much about Mazdas. The resistances are coils of wire usually mounted inside the motor in the air stream to cool them. Only having high speed means directly connected to ground and the coils are disconnected or broken. Quote Link to comment
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