Question about 2004 Chevrolet TrailBlazer

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Hvac fan only works on the 2 high speeds 4 & 5?

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The resistor pack for the blower motor needs to be replaced. It is located behind the glovebox.

Posted on Sep 25, 2010

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My suzuki alto stantard SZ 5 DOOR 2012 modle heating is now working Please advise


HVAC, the heater is not working?
the resistor only makes fan work , on low speeds.
1: is the fan blowing? heard and felt? on HIGH?
2: is engine coolant at 180F temp, or more holding, IT must, or there will not be heat,.
3: are both fire wall heater core hoses hot, fully? if one is cold the core is blocked. (flush it out)
4: Ok, we have hot water coolant to core (heater core) so is the damper open?, yes, then now you have heat for sure.

if all that is greek , get car serviced.
or buy the FSM book read , HVAC chapter
the factory service manual







Jan 18, 2015 | Suzuki Cars & Trucks

2 Answers

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

2 Answers

My fan blower will not work on high speed on my chevy 2005 silverado


if you got heat on all speeds and the blower motor is working properly then you probably need a new HVAC switch.

Jan 19, 2013 | 2005 Chevrolet Silverado

1 Answer

HVAC controls overheating


fan motor most likely at fault, low speeds cause extra heat in motor

May 31, 2012 | Mercury Grand Marquis Cars & Trucks

1 Answer

HVAC blower motor only works on 4 & 5 high speed settings. Fuss?


Most likely it is the controls not a fuse. A bad fuse would not let the blower work at all.

Mar 05, 2011 | 1999 Oldsmobile Cutlass

1 Answer

2005 Jeep Grand Cherokee. Htr/AC fan switch only functions @ highest speed. At lower speed settings I can hear doors opening and closing---but not air.


replace the blower motor resistor. It controls the fan speeds. It defaults to high speed only when it fails.

How to replace the blower motor resistor block: Caution: Stay clear of the blower motor and resistor block (Hot). Do not operate the blower motor with the resistor block removed. 1. Disconnect and isolate the battery negative cable.
2. Remove the glove box from the instrument panel.
3. Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch.
4. Depress the latch on the blower motor resistor wire harness connector and disconnect the connector from the resistor.
5. Remove the two screws that secure the blower motor resistor block to the HVAC housing.
6. Remove the resistor block from the HVAC housing. Installation:
1. Position the blower motor resistor block into the HVAC housing.
2. Install the two screws that secure the resistor block to the HVAC housing. Tighten the screws to 2.2 Nm (20 in. lbs.)
3. Connect the wire harness connector to the resistor block.
4. Push in the lock on the blower motor resistor wire harness connecgtor to lock the connector latch.
5. Install the glove box.
6. Reconnect the battery negative cable.
7. Have a nice day!

Oct 11, 2010 | Jeep Cherokee Cars & Trucks

1 Answer

2006 GMC Envoy I6 HVAC fan stopped working. Level 5 stopped about 6-months ago and now it doesn't work at all. I checked all fuses and the cooling fan relay but still not working.


If high speed went out first, then it is the switch.
There is the most arcing in the switch at high speed.
If there was motor or relay trouble, it would effect all speeds.
If there were problems with the ballast resistor, it would effect lower speeds.

Aug 07, 2010 | 2006 GMC Envoy

1 Answer

Fan only works on 4 and 5 settings? Is this a


Hello,

I have a 2003 Chevy Cavalier. The HVAC airflow dial only works on high setting. We checked the fuse and it's o.k.

What now?  Any estimate as to repair cost? 

Thank you

Sep 07, 2009 | Chevrolet Malibu Cars & Trucks

1 Answer

Blower fan only works on high


CHECK THE HVAC CTRL FUSE.

WITH A TEST LIGHT CHECK THE BLOWER RESISTOR FOR POWER ON THE YELLOW, TAN, PURPLE, AND LIGHT BLUE WIRES. THE ORANGE WIRES CONTROL THE HIGH SPEED CIRCUIT. DO THIS FOR EACH POSITION OF THE BLOWER SWITCH.

THE BROWN WIRE ON THE HVAC CONTROL CONNECTOR 1 POSITION B COMES FROM THE HVAC FUSE 20 AMP. NO POWER ON THAT WIRE WILL CAUSE THE BLOWER TO NOT FUNCTION ON THE LOWER SPEEDS.

Jul 14, 2009 | 2000 Pontiac Grand Prix

1 Answer

Only have 1 speed on HVAC fan


the fan relay(resister) that control fan speed is probably burned out.When this occurs it will only blow at high speed because its getting 12volts directly to the fan

May 25, 2009 | 2004 Pontiac Vibe

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