1997 Ford Windstar Blower speed control

FATTONY

MEMBER
1997 FORD WINDSTAR
6 CYL
FWD
AUTOMATIC
133,000 MILES

On my windstar van the heater and A/C only physically blow air when the blower speed switch is set to high. Alll the other positions dont do anything. I already tried a switch from the ford dealer which produced the same results. Is it the blower itself? I am a backyard mechanic but, I cant follow the wiring harness even after taking half the dash apart. The harness kind of disappears. What could it be? Is there a relay which controls this?

5 Replies

JDL

MECHANIC
16,098 POSTS

Hello, I don't have a wiring diagram for your blower. Usually the high speed is wired differently form the lower speeds. The lower speeds use a resistor circuit. I'd check the circuits at the blower resistor.

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Sunday, January 25th, 2009 AT 10:54 AM

FATTONY

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4 POSTS

Where is the resistor circuit located? What would you do and how?

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Sunday, January 25th, 2009 AT 11:01 AM

FATTONY

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4 POSTS

When I find the resistor circuit, how many ohms should it read? Thanks.

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Sunday, January 25th, 2009 AT 11:03 AM

JDL

MECHANIC
16,098 POSTS

That's a picture out of the parts book, for the resistor. I don't have a location. You might follow the blower motor connector. As far as testing, Turn everything on, turn the blower speed to a lower speed, check for voltage going into the resistor and out. I don't have a wiring diagram on this, I have it for a 99 not sure if the wiring colors are the same?

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Sunday, January 25th, 2009 AT 11:52 AM

FATTONY

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4 POSTS

Thank you. I will look into finding where this resistor is. I might start at my parts store or ford parts counter on saturday. Once I find out where it is, I can check it and replace it if thats my problem. Thank you so much for your help.