Stop buying garbage
Join Date: Jan 2005
Location: New Brunswick, CANADA
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heater fan switch/relay/fuse/motor 89 22re
I would like to elaborate on the observations that I have made in relation to this problem. This is all related to the fan/heating system for the cab, not the radiator fan.
When I bought this truck a few years back the fan switch would only work on the high position. So this past winter it gave up the ghost. I thought naturally tht the fan switch would be the problem so I picked one up at the Toy dealership for $70. The backlight behind the heater/fan switch worked this entire time. So the new one went in and no dice.
Next I tore the fan motor out, hooked it up to a couple of wires run off the battery and it spun.
Next I checked the fan fuse. While in that area I noticed the relay made a noise when the fan switch went from the off position to low.
voltmeter in the fan fuse receptacle reads ZERO with switch on.
So...... my questions are ...
1) any thoughts?
2) what the hell does that relay do?
3) how does its(relay) function differ from the switch itself?
4) can I bypass the relay and run it into the fan fuse?
5) how do you test a relay?
I'd like to avoid buying any more new parts trying to diagnose this problem. I'd feel too much like a Canadian Tire mechanic if that were to happen.
Any assistance would be appreciated. I already have no heat so if all else fails I'll wire a 12" fan to the ceiling and point it towards the windshield to get me through the winter.