Question about 2003 GMC Envoy

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Fan blower will not work unless truned all the way up on highest number

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If it's only working on one speed:
Replace your blower control module IF you have auto climate controls.

If you have manual knobs- replace the blower motor resistor assembly.

Both are in the same location, under the glovebox. Remove the kick trim piece under the glove box to access the 2 screws that attach the piece to the blower motor. To unhook the electrical connectors, drop the glove box door. Stick your finger in a hold in the door on the left hand side. There you'll feel a spring loaded metal piece, push on this, and the door will release. Empty your glovebox first! Been there done that.
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Posted on Apr 16, 2011

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1 Answer

I have a 2002 Pontiac Sunfire. My fan stopped producing air (hot and cold altogether) - from the lowest setting to highest setting does not work.


HI,
sounds like a the heater/ blower fan relay went bad. Unless you're mechanically-inclined you'll need a mechanic to install the replacement.

Do a Google search for the relay or blower motor and/or search for a Chevy Cavalier (same car) forum to find a fix - if you want to tackle it yourself.

GL,
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Oct 30, 2013 | 2002 Pontiac Sunfire

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Air does not blow


The car normally blows air through the blower however the controls and settings of the speed of the blower are controlled by the blower motor resistor. The resistor controls the speed of the blower fan. If your blower still works on the highest setting then the blower itself is still in working order. If you are not getting any air at all, even on the highest setting, then chances are the blower has gone bad, blown fuse or open wire. If this does not help please give us more information to work with.

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Interior fan hasn't worked properly for some time, would only work on fan's highest setting. Now we've got no air at all, regardless of setting.


Blower motor RESISTER has went bad. Its behind the blower motor; small hands are a definite plus for changing it.

Aug 08, 2012 | Cars & Trucks

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Hi, two things so far, heat/air only comes on if it is at level 5, highest, no low fan speeds at all, also , no lights on radio/and temp control (of outside temp) is it a fixable prob, or are the...


As far as the blower motor fan speeds, the blower motor resistor is the culprit for that, and as far as the LCD display lighting, that is out for good unless you care to replace the very expensive component. But at least you can now have the capability to adjust your fan speeds.
Thank You

Apr 14, 2011 | 1999 Oldsmobile Silhouette

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2002 Honda Odyssey fan only works at high speed. The A/C compress


Usually when the blower fan only operates on hi speed, its because of a failed blower motor resistor. You still have hi speed because on hi, the power going to the blower motor goes directly to it, as opposed to the lower speeds, when the power is routed through the resistor, thus lowering the voltage, which in turn lowers the speed of the fan. The resistor is usually located near the blower motor itself, under the hood back near the firewall.

Aug 15, 2009 | 2002 Honda Odyssey

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Fan switch only works on the two highest settings


the various speeds are controlled through resisters (spring-like in apperance) one of different value for each speed, none for highest speed as the power gets to the blower uninpeeded . the resistor pack should be located on the center of the firewall, held by 2 screws. thats under the hood. where the engine bay ends....

Jul 22, 2009 | 2003 Buick Century

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A/c fan only works on the highest setting...not the lower ones


A/C fans only really have (2) speeds. (0)Off... and (4)On. Settings 1,2,and 3 are governed by a series of two resistors which in combinations (one, the other...then both) can limit the speed of the fan. When the circuit with these resistors goes bad, the middle speeds of your fan will cease to work. Since the highest setting is unresisted it will never stop working... unless your fan fails.
The solution is economical as these are simple inexpensive parts. For simplicity, the panel with the resistors is typically located in the dash, right behind the speed selector knob. It may be an integral component with the knob assembly depending on your manufacturer. Replace the assembly, or simply the resistors if you are lucky. On the bright note, it doesn't sound like you need to mess with your blower moter... its fine.

Cheers, unclouded.

Jul 07, 2009 | 2002 Chevrolet Tahoe

1 Answer

Heater issue - only works when on highest setting


this is caused by the blower motor speed control resistor being defective, this part is located near the blower motor.

Oct 30, 2008 | 2000 Chevrolet Prizm

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