High speed dash AC fan

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Brave Willy

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Joined
Jan 16, 2017
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48
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Dorset Ont
The high speed dash fan stopped working on my 2004 Brave    I changed the resistor but still no high speed    Any ideas ?
 

TheBar

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Jun 25, 2018
Posts
1,285
Location
MS
Had a 1974 Camaro where the high speed on the switch itself burned out every few years. Was not the resistor which is usually the cause. Some have a separate wire for high speed only which may have become disconnected or corroded.
 

Henry J Fate

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Joined
Jun 14, 2018
Posts
1,979
It sounds like the speed control but I would still check the motor to be sure it is good. I believe you can bypass the control and apply 12 volts direct to the motor which in theory will put the motor to high speed. If the motor runs and the control is new, it is most likely a power problem. Either a bad ground or bad positive connection. Could be a bad new control but it seems unlikely.
 

ChasA

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Joined
Mar 21, 2009
Posts
2,325
Do the lower speeds work? In my experience, lower speeds are controlled by the resistor, but high speed bypasses the resistor.
 

John From Detroit

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Joined
Apr 12, 2005
Posts
26,277
Location
Davison Michigan
Two guesses..
On the GM designed systems (only one's I've worked on) the switch could be bad
OR: there is a "HIGH SPEED FAN" relay  There are two relays one works low and medium(s) via the resistor and the other is the one that kicks it into HIGH by feeding full voltage to the an (Bypassing the resistor) .
 

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