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marlinspike

07-24-2013 05:21 PM

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?

Computer_Nerd

07-24-2013 05:35 PM

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).

ufctapout

07-24-2013 05:48 PM

Re: HVAC fan doesn't work on high

Disregard Oldsmobile.

Ride BMW.

Dough_Boy.

07-24-2013 05:54 PM

Re: HVAC fan doesn't work on high

How did you rule out the resistor? Only thing left really is the control switch itself.

TATTRAT

07-24-2013 06:01 PM

Re: HVAC fan doesn't work on high

Quote:

Originally Posted by marlinspike (Post 8184056)

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.

Fabrik8

07-24-2013 06:17 PM

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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