Quote:
Originally posted by Power6
This would be true for speeds 1-3, but I believe 4 should be direct power to the fan for full speed. So the fault could only be in the switch or wiring.
Drew 88GT
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You are right, Drew. While it is true that the fan is grounded directly (not through resistors) on speed "4", it does this through a small green shunt connector, which is a part of the resistor assembly itself. Even if this green wire was not there, it should still work, but through the last resistor. I was just confused because the schematics in the shop manual show differing setups for the pushbutton and manual controls.
Here is what confused me:
manual (nonturbo, lever-operated) blower resistor assembly:
pushbutton (turbo model) blower resistor assembly:
I believe there may be an error in Mazda's schematics for the pushbutton controls regarding the resistor pack. Notice that the green wire is shown in different locations between the two scans. For the pushbutton controls (2nd scan), notice that it shows the green shunt connector connected between the resistors corresponding to speeds "3" and "4". This makes no sense whatsoever though. It should be shown connected between speed "4" and the negative (ground terminal) for the blower motor, as is shown in the manual control schematic (first scan).
So the resistor assemblies are most likely identical. So evo, I think it probably is the switch that is at fault. They should be a dime a dozen at the yards