Question about 2000 Oldsmobile Silhouette

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Heater fan works only on speeds 4&5 and not on 1,2,or3

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Switch is bad

Posted on Oct 10, 2009

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Posted on Jan 02, 2017

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1 Answer

Why won't my cooling fan turn on (swapped thermostat, thermoswitch, fan really)(fans work when hard wired to battery). Causes car to overheat in idle.


depending on the year, there should be 3 relays that control the fans.
There's a rad fan relay (4 pins), an a/c condensor fan relay (4 pins), and a fan control relay (5 pins). This allows them to be run at low speed or high speed. Check the grounds behind/under the righthand headlamp.
Check Fuses 57, 58 (30 Amps) and fuse 46 (15A) under the hood, and fuse 3 (7.5 Amps) in the driver's underdash fusebox.

May 18, 2014 | Honda Pilot Cars & Trucks

1 Answer

Heater fan speed control inside car has 1 to 5 speeds, only 4 & 5 worked for a year or so. Now only 5 works. Fuse problem or what?


no sounds like u have a switch problem :) i would reccomend replacing the switch... Hope this helped

Feb 26, 2011 | 2002 Buick Rendezvous

1 Answer

Heater fan dose not work on the 3rd speed. But works on 1,2 & 4 speeds.


the fan resistor may be bad only allowing certain speeds. this is located under right side of dash in the face of fan housing next to fan. here is a picture to aid you. hope this is helpful onetufshoppe_91.gif

Jan 31, 2011 | 2005 Chevrolet Colorado

3 Answers

The heater/ac fan only works on speed settings 4 & 5


you might check your switch sounds like to me that your two lower speed sides of the switch maybe burnwed out.

Dec 19, 2009 | 2002 Chevrolet TrailBlazer

2 Answers

Lowes 3 fan speeds don't work


You need to replace the fan spped chip located under the hood....If you look under the hood at the blower motor, you will see the power plug for it. Follow the wires down to the chip board they run into That is your problem area.....power chanels 1,2, & 3 are burned out pull the 2 bolts and remove the board, replace with a new one...You can buy used if you like but odds are they'll have an issue with them too. Real easy fix.

Oct 09, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Only 4 & 5 speeds work on the AC fan dial...1-3 do not blow any air but you hear the AC kick in


There is a blower control module in the heater case that is known for going bad.Also it will sometimes burn where the connector plugs in.

Aug 04, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

MY heater fan works on 4 & 5 Only on my 2000 Silverado


remove the passenger side lower insulator panel. behind the panel you wil find the blower motor housing. next to the blower motor housing there will be a wiring connector with 6 to 8 wires going in to it. the connector will be held secure with 2 screws. remove the connector and remove the screws -- this is your resistor. reverse the process to re-install.

Jul 21, 2009 | 2000 Chevrolet Silverado 1500

1 Answer

Need Fuse Map Diagram BMW 318i 1993


check the internet for a bmw e36 ETM ( electronic troubleshooting manual) everything you need is there.

Jun 02, 2009 | 1994 BMW 3 Series

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