Question about 1998 GMC Sierra

1 Answer

Heater blower motor doesn't run

I checked heater motor it works fine. Replaced heater switch and checked voltage across fan fuse. Where is the relay located for the fan it doesn't appear to be with the other relays under the hood?

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  • Finlay McRae
    Finlay McRae Mar 25, 2012

    It got dark not long after I read the possible solutions so will try suggestions tommorrow

  • Finlay McRae
    Finlay McRae Mar 26, 2012

    I cannot locate the Blower motor relay and the Blower motor resistor.. Does anyone know where they are?

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  • Contributor
  • 6 Answers

Check under your dash by the fuse box might be there

Posted on Mar 24, 2012

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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Ronnie Houston

  • 2920 Answers

SOURCE: Blower Fan will not blow, we have already replaced Heater Control

you need to replace the fan ...its under the hood on the passenger side held in bt 3 screws and one plug this is the only motor on that side of the vehicle and only takes a half hour to change out

Posted on Jan 25, 2009

emissionwiz

Marvin

  • 85216 Answers

SOURCE: blower motor not working. replaced blower motor,

did you replace the speed control resistor near the blower motor?

Posted on Sep 28, 2009

emissionwiz

Marvin

  • 85216 Answers

SOURCE: heater fan motor quit working already checked all

check the fan switch in the dash and the fan motor connector for burning, if u find burned connectors replace them and the heater blower switch.

Posted on Mar 08, 2010

ZJLimited

ZJ Limited

  • 17970 Answers

SOURCE: i have a 99 gmc

I'm assuming that the blower isn't work in LOW, then with blower control speed at Low, you have no power supply to the yellow wire. Let ma know the following:
1. Do you have power at the Tan wire when blower speed is set at M1?
2. Do you have power at the Light Blue wire when blower speed is set st M2?
3. Does applying battery voltage to the terminal of the resistor at the yellow wire work the blower at low speed?
4. Did you test the HTR fuse ( 25A) in the fuse box?


If you have power on the brown wire coming from the heater 25amp fuse when key is On and when you switch to low the yellow wire should have power-Is this happening if not were right back with HVAC control module. Now if yellow has power ,blower motor should come On-if not-check and test the ground pointG201 at right side of dash.

Keep us uodated.

Posted on Nov 11, 2010

Jonah Oneal

  • 14092 Answers

SOURCE: --2005 GMC Envoy AC Trouble--(compressor

SOUND LIKE BAD BLOWER MOTOR RESISTOR.CHECK BLOWER MOTOR HI BLOW FUSE AND RELAY.YOU WILL NEED OWNERS MANUAL IN GLOVE COMPARTMENT TO LOCATED BLOWER MOTOR FUSES AND RELAYS.

Posted on Jun 06, 2011

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I have a 2005 Chev Avalanche. The heater blower does not work on the high setting but works fine on settings 1 through 4.


I looked at 05 avalanche 1500--automatic hvac. The blower fuse is hot all the time. The fuse has an input leg and output leg, even if the fuse is blown, the input leg would still have voltage. If no voltage, you could use jumper wire connected to voltage on the output side of fuse cavity to see if blower would work. If you use jumper, use an inline fuse.
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Blower motor does not work replaced the blower motor, resister, fan switch and relay still does not work


blower , heater dead.?
use a voltmeter, and find out what is wrong, in minutes.
first check voltage to the blower,
on fan high.
got voltage there. then the blower is bad.
no voltage there, then its not the blower bad. its controls or power feed.
my guess is you dont know that fuses that look good can in fact be bad.?>
old post. but here goes.
of lost, use a schematic, they tell you how the circuit works.
click here
on TJ
then heater........
FSM
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

shows 7 things can be wrong. (omg what to do, use a meter)

now click A/C heater page.
same FSM.
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both sides of fuse must be 12vdc or the fuse is BAD.
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if you have 12vdc on pin1 then then check voltage at
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if the wire to the switch C3 pin C is 12vdc that means the ground to the heater control is open. correct that
if the pin C3pin C is 0v, that is good, if switch is on high
and the C1 pin A is 12v, that means the switch is bad, or wires to it cut
or the connectors to IT are corroded.

just a $10 walfart DMM meter, and bam , why is know.
no guessing or pulling out hair.
as you can see the dash heater switch grounds the blower.
if it can not ground the motor, the motor will be dead.
that is how it works.

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