1990 Ford Aerostar Heater/AC Blower Not Working

JAYCEE

MEMBER
1990 FORD AEROSTAR
6 CYL
AWD
AUTOMATIC
100,000 MILES

I am trying to help a young lady who is disabled and depends upon a 1990 Ford Aerostar XL 4.0L AWD van that was given to her by her church, for transportation to medical appointments.

Suddenly, with no prior sign of a problem, the blower that sends heat or AC into the passenger compartment has stopped working. The van has only one heating system. It blows air into the front passenger compartment, there is not one for the back of the van as with some Aerostar models.

I have checked the fuses and have tested the heater blower motor and the resistor that is located adjacent to the blower motor assembly. Everything seems fine, but still no air blowing into the passenger compartment.

When I flip the up-down fan control switch that is located on the climate control panel to the right side of the dash gauge assembly, nothing happens on any speed.

Any ideas as to what he problem may be, and how I might help this girl get back on the road with a working heater?

Thanks to all.

5 Replies

SATURNTECH9

MECHANIC
30,869 POSTS

So do you have a multimeter to do some testing?With the blower speed on any setting I would check all the setting's though you should have fully battery voltage. The way it control's the speed is by varying the resistance to ground thru the resistor. Let me know if you have battery voltage to the motor and we will go from there. Also if you have a multimeter because you will need one.

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Thursday, December 30th, 2010 AT 8:55 PM

JAYCEE

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4 POSTS

Thanks for the response. What I can tell you is a buddy helped me to connect the blower motor directly to the battery and it ran just fine. Also, we installed a brand new resistor from a parts store that authorized me to return it if that didn't solve the problem, and it didn't solve the problem. And NO, I don't have a multimeter but will borrow one from a friend if need be. Do you suppose it's possible that the plug-in just behind the fan control switch on the dash panel is bad? Or maybe a bad relay somewhere?

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Thursday, December 30th, 2010 AT 9:40 PM

SATURNTECH9

MECHANIC
30,869 POSTS

You could have a relay bad or wiring or even a loose connector. With a meter we can see if were missing the power or the ground to motor and narrow it down from there. Get the meter so we can figure out what's going on.

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Thursday, December 30th, 2010 AT 9:48 PM

JAYCEE

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4 POSTS

Please be so kind as to check back on this thread tomorrow. I'm in Denver and we're having a major winter storm at the moment. It's going to be tough for me to get that meter this evening, but I'll do it tomorrow and I'll give you a shout when I'm ready to go. Thanks again for the assistance.

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Thursday, December 30th, 2010 AT 11:01 PM

SATURNTECH9