1990 Chevy Astro heater fan control

LITTLEGIN

MEMBER
1990 CHEVROLET ASTRO

Electrical problem
1990 Chevy Astro 6 cyl Two Wheel Drive Automatic

when I turn on my heater fan, sometimes the fan works and at other times it will not turn on the fan. How do I get the control out of the dash?

Thursday, February 12th, 2009 AT 11:33 AM

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

Hi:
Have you checked to see if there is power going to the fan motor? Before removing the switch, check because there may be another cause.

Let me know what you find.

Joe

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Thursday, February 12th, 2009 AT 1:14 PM

LITTLEGIN

MEMBER
3 POSTS

As I tried to explain, most of the time when I turn on the fan with the switch, the fan goes on and startst to blow out the heat. KBut aqt other time I turn on the fan switch and there is nothing the fan does not try to come on, and there is no power at the fan motor at this time, but if I tried it a little later it sometimes comes on? Any good ideas on this intermittent problem. Thanks, Ben

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Thursday, February 12th, 2009 AT 5:14 PM

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

Ben:

I didn't realize you already checked for power when it wasn't working. The other things that could cause this type of issue are the blower motor resister and the relay. Here are listings of location:

The blower motor relay is located on a bracket attached to the right side of the vehicle, near the blower motor.

And the resister:

These are other things that could cause the problem. I would work backwards from the motor to the switch checking for power at each.

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Thursday, February 12th, 2009 AT 6:35 PM

LITTLEGIN

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3 POSTS

Thanks for your great help, I will check out the resister and the relay on the van. I still do not know how to get the blower switch out of the dash board to check it out.

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Friday, February 13th, 2009 AT 9:21 AM