I have a 1990 mustang and the blower will not blow when set on high but blows on all other speeds. Is this a problem with the blower or the switch?
a/c blower problem
Feb 23, 2005
3 Replies
Sounds like the switch to me. If the blower works at all, the motor itself is fine.
IIRC, this car will have a high blower relay.... check your owners manual... especially the section regarding the underhood junction box.... the handy dandy laptop/library is at work tonight.
Either the blower switch is defective or its ground path is open circuit. The ground connection to the blower switch is strictly for high speed. The other speeds use the switch and a combination of series resistors with another path to ground...
Mike
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