1990 Chevy Astro heater fan control

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

4 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
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
Tiny
LITTLEGIN
  • MEMBER
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
Tiny
JACOBANDNICKOLAS
  • EXPERT
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:


http://www.2carpros.com/forum/automotive_pictures/249084_1_1.jpg




http://www.2carpros.com/forum/automotive_pictures/249084_2_1.jpg



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

And the resister:


http://www.2carpros.com/forum/automotive_pictures/249084_3_1.jpg



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
Tiny
LITTLEGIN
  • MEMBER
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

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