Blower Motor Issues

88 Pontiac 6000, 2.5 No Air
Low and high went out on the heater, so I replaced the switch figuring that if it weren't bad it soon would be, so what the heck. Didn't fix it.
Medium still works, just no low or high.
Before I replace the motor, is there any sort of relay or whatnot in the mix that I need to look at first?
Thanks.
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Usually, there's a resistor block that fails. What they do is:
On "Hi", full voltage (say, 12v although it's actually 13.8 or so while car is running) goes to the blower.
on the other settings, the switch routes the voltage through a resistor. So the motor runs slower. It takes usually, about the same amperage, regardless of setting.
The resisitors will break/ go open causing what you describe. Usually, the resistor is located near the output of the blower motor, in a duct, that is accessable under the passenter side. Sometimes, you need to remove the glove box. A shop book should show you where. Replacements run $10-30, depending on vehicle. Try that next.

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wrote:

that
mix
Well... I followed up on your suggestion and found some interesting things about this car that I'll start a unique thread to.
Nuthin's ever simple. ;-)
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Rey
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