Question about 2003 Chevrolet Suburban 2500

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Heater fan won't turn off.

When truck is turned off the heater fan/blower won't turn off. It is on very low, almost silent. I had to go to the fuse panel on the drivers side engine compartment and pull the 40amp fuse. What could cause this? How do I fix it? my heater fan is stuck on and even with the suburban turned off it still runs - had to pull the fuse out

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Unplug the blower resistor/relay, If the blower quits replace it.

Posted on Feb 27, 2009

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Youve got a short prob right at the switch in the dash,unplug the switch and if it shuts off then replace it,if not run new wires form the fan motor too the battery thru a toggle stwich

Posted on Feb 27, 2009

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1 Answer

Blower not working at all. Fuses & relays ok. Aircon cuts in when fan is turned on but no air from vents. Need to know what colour wire supplies power to the blower before I assume the motor is faulty


the blower is silent.????????? yes, sounds matter !
ON HIGH TOO? (fan speed max)????
or makes normal sounds, but does not blow.
1 or the other.?

the blower if dead silent can be hot wired (blows now?) (costs zero to do)
or using any voltmeter made. measure for 12vdc on the 2 pin
to motor, fan on high. (costs $10 for tool at walfart)
if 12vdc there, (across the 2 pins) then the fan is bad.
of 0v, the controls are dead.
the fan on most cars. on high, bypass the fan speed resistor block.
what you dont have is the schematic,
its at 2 places (usa ,min)
alldata.com
and suzukipitstoppus. (real fsm book)

2000 GV, data, below.... it takes all of 10sec to look.
all answers, USA cars, as this is a USA forum.
i click HVAC for you.
as you can see the switch is grounded at red circle.
and with fan on high ground (0v) is applied to the motor low pin
and if the relay is hot, (2 fuse good) the output of relay b/w wire
will be at 12vdc, if not the relay is bad.(fuses good)
cant be more simple. same from 89-2000 after that things get harder, (controls) your car has a motor driven mode damper
that is why i asked the sounds questions. as it too can block the air flow. (with a perfectly running fan)


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May 03, 2015 | 2000 Suzuki Grand Vitara

2 Answers

Suzuki x4 2009 fan does not spin but when I turn air on it blows cold air.


Not sure which fan you mean. Engine cooling fan is different from heat/air blower fan.

Feb 04, 2015 | Suzuki Cars & Trucks

1 Answer

What causes heater blower to barely work on high? wont work at all on low


A couple of possibilities; air path blocked by debris (mouse nest, etc.), the sleeve-type phosphor-bronze fan bearings are clogged with wear particles, less likely but still possible is a failing blower switch, failing ground for the fan motor or an oxidized fuse or fuse holder.

A multimeter would be handy to isolate the source of the problem.

With your headlights on and shining on a vertical flat surface, try noticing if they dim very briefly when you quickly turn the blower on.
If not, then the fan isn't getting full current, if they do, then this would indicate a bearing problem with the fan.
Good luck-

Jan 09, 2015 | 2001 Isuzu Trooper

1 Answer

Heater won't blow


Check your blower motor resistor connection.Turn switch and fan on then wiggle the resistor pigtail fan should turn on if not replace resistor.These get to hot and usally melt the pigtail and loose their connection.

Jan 13, 2012 | 1998 GMC Savana

1 Answer

Heater won't turn on


CHECK AC AND HEATER CONTROL FUSE. IF FUSE OKAY CHECK BLOWER SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR MORE LIKELY FAULTY.IF NO POWER GOING TO BLOWER MOTOR CHECK BLOWER MOTOR FUSE ANDRELAY.

Oct 28, 2011 | 2000 Kia Spectra

1 Answer

On my santa fe the heater wont turn on. I have


It could be your blower switch, but more than likely it's a resistor that is usually a part of the blower assembly, and it operates the speeds. Doesn't cost much but can be tricky installing. If you had one or two speeds not working, initially, eventually all may stop. If fan stopped working and all speeds had been operating, then you may have a bad wire or blower motor. Also, check your manual for fuses, as there may be a compartment inside the vehicle as well as one under the hood.

Dec 27, 2009 | 2002 Hyundai Santa Fe

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Heater/AC fan won't operate


your blower motor has gone bad and it over heats and shuts down

May 31, 2009 | 1996 Buick Riviera

2 Answers

FUSE BOX DETAILS


left to right...
1. empty
2. e flashers
3.horn, brake lights
4.clock, trunk light, inside light, radio
5. rad. cooling fan relay (AC only)
6. right side running lights
7. left side running lights
8. right high beam and indicator
9. left high beam and indicator
10. right low beam
11. left low beam
12. reverse,turn signal and inst panel
13. main and transfer fuel pumps, auxiliary air reg., ox sensor heater
14. license plate and glove box light
15. wipers
16. rear defogger
17. heater blower (no AC)
18. cig lighter
19. rad cooling fan (no AC)
20. Heater blower (AC)
21. rad cooling fan (AC only)
22. empty
23. Ox sensor, idle stabilizer,seat belt warning relay, (Digifant only, control unit, idle boost control, idle boost valve)
24. inst panel lights, heater control lights
25. reading lamps
26. empty
27. empty
28. empty

Hope this helps...;-)

Apr 17, 2009 | 1992 Volkswagen Fox

1 Answer

Heater blower wont turn off low


what year model and make? it could be the blower module by the blower fan. just depends on year.

Mar 03, 2009 | 1993 Mitsubishi 3000GT

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