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  #1  
Old October 4th, 2017, 08:58 PM
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Heater-speed Question?

I know the mid nineties heater controls had 3 notches and 2 speeds, low and high. My question is wether the speed are cumulative?
My heater only works on the 3rd notch (high) and it's very weak, I'm wondering if my 2nd notch (low) actually worked proper, would it add push to my high setting?
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  #2  
Old October 4th, 2017, 09:12 PM
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Use to think that the first notch opened a flap and the other 2 were Hi and Low fan speeds, but someone could perhaps chime in to confirm or correct.
I do know the blower is one speed with a resistor that reduces the current to about half speed.
Low speed is power through the resistor and high is power around the resistor directly to the brushes.
Speeds are half and full which explaining the weak air-flow.
Sometimes the switching arm can get bent and prevent contact as well.
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Old October 4th, 2017, 10:44 PM
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Great thanks
I'll look at it before I order a new one.
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  #4  
Old October 4th, 2017, 10:48 PM
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You need to troubleshoot to see if the problem is the switch or the blower resistor or the fan. First step is to understand the wiring.
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Old October 5th, 2017, 08:39 AM
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just pull the three-conductor plug in the engine bay and apply 12V and ground to the proper terminals, and you've got your answer
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