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A while back the heater fan motor packed up, it was running Ok on high speed and just stopped, all I get is a click from a relay somewhere under the dash when it's switched to the high position. Yesterday the engine overheated in traffic as the cooling fan failed to work. There is no power to the heater motor or the radiator sender connected to the cooling fan. I've checked the two fuses covering the heater motor and switch - power on each side of them, and the separate cooling fan fuse which also covers the horn, is Ok. Are the two faults linked, or just a coincidence, and can anyone help ?
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Failed heater motor suggests resistor pack failure.
Cooling fan switch is possible cause.Try shorting out terminals on switch connector..If the fan works switch has gone. If it does not-possible fan motor failure?..The two as far as I know are not related
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Steve
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Cheers steve o - I've tried shorting the cooling fan wires, but as I say - no live feed anyway. You could be right about the heater fan resistor, but I was wondering if there was a plug / socket, linked to both fans, that might have loosened or corroded. If not, I might try looking underneath the fairly exposed fusebox. The odd thing is both fans were working fine before the double failure, but the cooling fan rarely kicked in so I'm not certain if it failed at exactly the same time as the heater fan.
None.
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You mentioned interior fan working on one speed only.Other speeds are controlled by resistors(resistor pack)High speed no resistance/Full blast..
Radiator fan has a thermo switch.Mounted either on the rad/thermostat housing. This is the connection to short out.. being negative switched..Not Radiator fan connection as it has both positive and neg terminals..
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Steve
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Steve, thanks for help. The two faults were unconnected. It turned out that the permanent live feed to the cooling fan motor was broken (corrosion). The temp sensor must be connected to a relay which earths the fan motor. The heater fan, as you suggested, failed due to a faulty resistor. For the time being I've bypassed the resistor and now have a fan working at full blast or not at all.
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