Question about 2004 Chevrolet Silverado 1500 Crew Cab

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2004 Silverdo heat fan on with engine off and works with fuse out

I thought we had problem of blower coming on with truck off nailed down to resistor. However until we had a chance to remove it, we pulled the fuse. Since it's freezing here, reinserted fuse while driving. Later, stopped vehicle, removed fuse. Got back in vehicle forgetting to reinsert fuse and heater blower fan works correctly on all speeds except 5. Help with this one. It's as if removing the fuse corrects all the problems.

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The Highest fan speed is applied through a relay that is part of the resistor assembly, and the fuse provides unswitched 12-volts to the relay. The relay contacts are most likely welded closed, causing the blower to run on high whenever the fuse is in play. If you feel lucky, you might give the relay a rap with a tool handle to try and dislodge the contacts. If this is successful, you may use the blower as normal until the problem re-occurs, as it probably will. The only real solution is replacement of the relay/ resistor.

Posted on Dec 18, 2008

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3 Answers

1995 Geo Prizm. A/C works and is properly charged but fan won't turn on. also speedometer doesn't work and longer.. any correlation?


blower fan in dash.
fan on RAD
fan in front of ac condenser in front of car.
does the fan in dash blow , on high?????????
does it? if not say so.

the car is Corolla,
and same car.
and works same.
when the Blower dies, in the dash , the A/C will be cut off fast.(but not if blower is dead)
this is normal for blower dead. (power to it, dead )
this is to prevent icing up of the evap core (might crack it)
SPEEDO SIDE TRACKED:
are both speedo and odom are dead?
why not say so/?


26232154-4g1iytzfkimywqjfw30jhjyb-3-0.jpg rule 2, if the dash blower blows on high , its not the resistor block
proof.
below.

on high the resistor block is bypassed,
if blower works and that center fuse below blows, the AC goes dead because 12v dont make it to the the clutch relay.
if top fuse below blows, a./c and blower die. even on high.
26232154-4g1iytzfkimywqjfw30jhjyb-3-1.jpg
you can see all this stuff on mitchell's, if you want. as most do.


btw , the a/c compressor may work , if the the blower has power, but the blower is burned out.
the A/C amp logic module sees the 12vdc leaving the switch and assumes the blower works.
this rule on blower on, is to keep the core from icing over, and that can bend things.
that resistor block is air cooled, and is on the fan chamber to get cooled that way, if not it burns up.
but why not tell us if the fan works on high.
that way we save 90% of all BS guessing.
why not?

first is fuses.
then if fan blows on high only, then the fan is ok and the resistor block is bad.
if blower dead on high, the blower is bad,
the fuse blown or the wires to it are bad or the switch,
what a tech does is use his voltmeter, a $10 tool.
if you have 12vdc to the motor then the fan is history, dead.
if not, 12vdc there, fan on, then you work them meter backwards until you find the open circuit.
really its that simple.
if confused ask quesitions.
if you cant test the fan on high, tell why?

Jul 05, 2016 | 1995 Geo Prizm

1 Answer

Rear blower: only works on high when set on cold, won't work at all when set to heat


I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that

Dec 07, 2012 | 2004 Honda Odyssey

1 Answer

Dodge caravan heat fan won't work


If it is the fan/blower that is not working (as opposed to what is coming out is cold), then the problem could be 1) fuse 2) Blower Resistor. I just replaced the blower resistor in about 15 min with a $25 replacement resistor. The unit is right behind the glove box.

If the problem is that the air coming out is cold and not hot, then the thermostat, radiator, heater core, etc... are the more likley causes.

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1 Answer

I turned my heat on yesterday morning and fan was running on high and couldnt turn fan speed down , went to turn the heat off and fan still was running on high, i had to pull the fuse to get the fan to...


I would take a SWAG that the blower motor resistor is shorted to power, causing the issue.

2004 New Body Style ( non Heritage or Lightning models ) - Red arrow pointing to it.
Need to squeeze the top of the glove box together, to let the stops come past the opening, and let it drop straight down.
sscullys_209.jpg

Picture of 2004 Heritage / Lightning model ( 00-03 MY body style )
Taken from passenger side floor, up behind dash / glove box.
sscullys_210.jpg
This is the resistor and the pigtail down above
sscullys_211.jpg

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1 Answer

The heating and air conditioning fan only works on the highest speed position. What would cause the lower speeds not to work?


If the system is a Manual ( not the EATC / Electronic Automatice Temperature Control System ) it is most likely the blower motor resistor.

For the new body style 2004 ( not the 2004 Heritage or Lightning models ), it is behind the glove box.
Open teh glove box, press on one side, to allow the glove box to hang down.
The Blower motor resistor is located in the side of the blower motor housing.

ea44d96.jpg

If your 2004 is a Heritage or Lightning, the blower motor resistor is access from under the dash / glove box area.
7e8c043.jpg

On this type ( same as the 97-03 ) the blower motor resistor or the resistor and pigtail might need to be replaced.
452e89b.jpg

Just pay attention to which body style 2004 you have ( new like the 2005-2008 or the 2004 Heritage / Lightning, which looks like the 97-03 MY trucks.

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1 Answer

The heater fan is not operating and I thought it might be a blown fuse. I checked the fuse box under the dash and couldn't locate the fuse for the fan by the descriptions given. Do you know which fuse on...


My 2002 I35 has the blower fuse under the hood in the fuse box in the engine compartment. The fuse box cover has the "key" or description of which fuse is which. If the blower fuse is bad and you replace it, only to have the fuse burn again then I would check the blower resistors that are located behind the glove box. Very common for one of these resistors to go bad causing only low speed operation of fan. Burns the fuse when you try to operate the fan on the higher speeds. Good Luck

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4 Answers

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