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HVAC fan doesn't work on high

Old 07-24-2013, 05:21 PM
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Default HVAC fan doesn't work on high

Vehicle is a 1994 Oldsmobile Bravada. The HVAC fan doesn't work on high, but it works fine on any other speed. Setting it to high just shuts it off. It's not the blower motor resistor. Any other ideas?
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Old 07-24-2013, 05:35 PM
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Default Re: HVAC fan doesn't work on high

Look for an inline fuse that is used only for the high speed setting, which pulls more amps than the lower speeds (which go through a separate set of resistors and fuses).
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Old 07-24-2013, 05:48 PM
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Default Re: HVAC fan doesn't work on high

Disregard Oldsmobile.

Ride BMW.
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Old 07-24-2013, 05:54 PM
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Default Re: HVAC fan doesn't work on high

How did you rule out the resistor? Only thing left really is the control switch itself.
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Old 07-24-2013, 06:01 PM
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Default Re: HVAC fan doesn't work on high

Originally Posted by marlinspike View Post
Vehicle is a 1994 Oldsmobile Bravada. The HVAC fan doesn't work on high, but it works fine on any other speed. Setting it to high just shuts it off. It's not the blower motor resistor. Any other ideas?
Well there's your problem.
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Old 07-24-2013, 06:17 PM
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Default Re: HVAC fan doesn't work on high

Might be a bum wire or switch position. Can you access the switch by itself to test between the input and output?
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