Question about 1998 GMC Sierra

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Inside Fan Relay location

My inside blower fan motor works on 1,2,3, speed but on spped 4 it cuts off.

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  • david_mace Dec 18, 2008

    I need to know the location of the fan relay so it can be changed.

  • Anonymous Mar 30, 2014

    ac comes on after you kick the blower fan inside the cab



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Replace blower motor switch on dash

Posted on Dec 24, 2008

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Blower motor runs all the time with switch off and ignition off i think it is a relay on fan motor ?

Posted on Aug 19, 2009


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3 Answers

Where is the heater blower relay located on a 1997 Chev. S-10 Blazer

It's located on the blower motor. If you can see the blower motor it's right there. That controls your fan speed. Hope this helps.

Mar 18, 2015 | 1997 Chevrolet Blazer

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How do I check my fan switch air cond. blower motor?

2014 post.? old post, its DC motor NOT A.c.
direct current, not alternating current motor.
no need to guess, use a voltmeter, and save lots of cash, for sure..... a $10 voltmeter works,.

first off there are 2 systems. manual and auto
which is it? (options day 1)
on this car you scan it, first. it has DTC errors
not to be ignored, if present.

let me answer for all car HVAC car owners.
it can be many things.
1: fuses blow (dead fan)
2: wires bad, cut, or melted or corroded (weak fan)
3: controller is bad.
4: the dampers not open fully.
5: if HVAC has fan resistor it can fail on low speeds but not high. (or fail only on high)
6: if the fuse on the left below is blown there will be no high speed, Fuse #35 blown. no high.

note how this unique car runs a relay just for high. see drawing below.ff37835b-9047-4b0d-91e8-44f56ef6ba66.jpg

for sure the motor is last.
the fan can be hot wired, before removal
if passes that test its GOOD.
what matters is 12vdc (13.3 to 15v engine running)
to the fan.
and if only one speed fails, and not high say so
or if only high speed fails, say so.
as that set of symptoms is never a fan.
for sure if it runs ok on high.,
so fuses first.'
then the relay if high fail.s.

Sep 23, 2014 | 2005 Isuzu Ascender

1 Answer

2006 tacoma heat/air blower fuse location

Hello! Coil of Heater Relay is supplied through Fuse "IG1 2" (10A)...Located in the Drivers Side Box...Contacts of Relay are supplied through "Heater Fuse (50A)...Located in Engine Relay Box...Blower Motor has a 2 wire connector with wire colors: Black/Yellow (Pin 2)...And White/Blue (Pin 1)...Pin 1=Ground and Pin 2=Battery when Relay pulls and contacts close...
The Blower Resistor Pack (Which fails often) controls the fan speed...BUT, there is a fuse inside the assembly...If it blows = No Fan...Located on the top of the heater/AC box and can be accessed through the Glove Compartment...Guru...Saailer

Jun 01, 2012 | 2006 Toyota Tacoma

2 Answers

Blower motor speed not working

This is usually due to 1 of 3 possible problems.

  1. Bad blower motor resistor - attaches to blower motor and regulates fan speeds. Not uncommon to lose 1 speed at a time until you get stuck with only 1 speed
  2. Bad blower motor
  3. Bad heater control module - less likely but still possible the module is bad and the whole unit requires replacing

Oct 16, 2011 | 2000 Kia Sportage

2 Answers

Heater blower stopped working?

You may want to try your fan on all speeds. If it will work on high, you have a bad resistor for the fan motor. ( high speed doesn't go through the resistor ).
If it doesn't work on any speed, I would check the following;
1. Make sure the fuse isn't blown for the fan blower motor.
2. Check, or have checked the wires between the fan control switch and the fan blower motor.
3. Have the fan control switch checked.
4. Have the fan blower motor checked.

I hope this helps you.

Feb 03, 2011 | 2002 Buick Rendezvous

2 Answers


The blower motor fan is controlled by the blower motor resistor.Its the resistor which controls the fan on respective speed which you select.But if the resistor goes faulty,then it will not be able to set the required speed which you set for fan,so it works on high speed only. In this case you will have to replace the blower motor resistor. Check fog for the location of blower motor resistor location:--- see part number 8 in the diagram below. helpmech_11.gif

The blower motor resistor is located next to blower motor under the dash.Its fitted with 2 screws and a wiring connector.You have to remove the screws and wiring connector and take the resistor out and place the new resistor in same position and connect the connector as well as screws. ------------------- this should help.Thanks.Helpmech.

Jan 18, 2011 | 1999 Oldsmobile Alero

1 Answer

Does not put out heat or air. no fan spped or anything. got a new heater control head and still nothing. fuse is ok too

I would check the blower motor resistor. It varies the speed of the blower motor, and when they go bad, you will loose some or all of your blower motors speeds.

Oct 20, 2010 | 1992 GMC Sierra

1 Answer

Where is the fan in a 2000 dodge caravan

I am assuming you are asking about the Blower Fan and not the Radiator Fan?
The Blower Fan is located below the Passenger side Dash. It is inside the black Duct work.
May I ask what the problem is?
Is the Blower working or only working on High? If only on High then the Blower Motor is fine and the Blower Motor Resistor that controls the Low to High speeds is bad. This is located behind the Glove Box in the Dash and on the firewall. Remove the Glove Box to access. It is approximately 3 1/2 inches by 1 1/2 inches and has 3 to 4 wires going into it.
There is also a Front Blower Motor Relay located in the Relays and Fuses.
Before replacing the Blower Motor, get back with me (for free) and let me know. This may save you alot of money in the long run, saving you from purchasing parts you may not need!
Let me know if this helped, and let me know what the problems (symptoms/signs) are.
Contact me in the Comment Section of your Posted problem.

Feb 02, 2010 | 2000 Dodge Caravan

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