Question about 2003 Chevrolet TrailBlazer

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The cooling fan of the 2002 chevrolet trailblazer does engage in high rev when the engine gets hotter, so the temp keeps going up. The fan clutch is new as I change it because of the above mentioned. Can this be caused because the fan clutch does not receive any signal due to Engine Cooling Fan Wiring Harness problems (short-circuit)?

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Posted on Jan 02, 2017

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SOURCE: 1998 V6 camaro

check for power at cooling fan if there is replace fan motor if not check relay

Posted on Oct 16, 2008

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SOURCE: P0481; Cooling Fan 2 control circuit

should be the one on drivers side will have a light blue and black wire \s going too it

Posted on Apr 01, 2009

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SOURCE: my trailblazer (2002) was making allot of noise as i gave it gas.

YOUR FAN CLUTCH IS A ELECTRO VISCOUS PCM CONTROLLED FAN CLUTCH.SOUND LIKE THE FAN CLUTCH IS BAD.IT SHOULD HAVE LESS RESISTANCE WITH COLD ENGINE.AND HOT ENGINE THERE SHOULD BE INCREASE IN RESISTANCE.IF NOT FAN CLUTCH HAS FAILED.REPLACE IT.

Posted on Aug 13, 2009

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SOURCE: have a 2002 cavalier Z24 and the cooling fan will

there are two coolant temp sensors on this car one controls the fans and one controls the temp guage in the car. one is located near the thermostat housing and the other is usually located in the block. the one near the thermostat housing usually controls the fans. also try to jumper the fan and make sure the fan is working.

Posted on Aug 24, 2009

  • 10 Answers

SOURCE: air con compressor clutch does not engaged

sounds like you have an issue with a leak. I would recommend having a evac and recharge with a leak test. the reason it was getting worse was you were slowly losing r134a refrigerant and the low pressure cutout switch cut the compressor off and now there isn't even enough for it to run safely. so the bcm is stopping it until there is enough pressure.

Posted on Mar 05, 2010

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2 Answers

2003 chevy trailblazer cooling temp running 230


Smart man using a scanner for the actual temp. Assuming you're not losing coolant....2 things I'd look at here, 1st is you may have air in the system, make sure to purge all the air. 2nd is your fan clutch, I've replaced a few fan clutches in my own Trailblazer. Have had them bad right out of the box brand new. Have had bad brand new fan clutches on 2 of my last Trailblazers. You should hear it engaging especially in stop and go traffic.

Aug 02, 2016 | 2003 Chevrolet TrailBlazer

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Filled Coolant reservior and radiator Drove trailblazer at highway speed no cooling problem. When slowed down in traffic temperature increased to about 220 and higher, could hear coolant bubbling in...


If there is bubbles occurring even inside the top part of the radiator (where you have the coolant put in), you may have a leak on your head gasket. You may be loosing coolant through the engine.

Sep 15, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Clutch not working when temperature is high


You mean fan clutch? If so, check the wiring harness for frayed wires. These fan clutches for Envoys and Trailblazers tend to go out often. BUT, the more common problem is for the fan clutch to stay engaged, keeping the engine temperature too cool.

On another note, if you think 210 degrees is too high.....that's what it's supposed to run at, these engines run hot and should be dead on 210.

Feb 25, 2011 | 2004 GMC Envoy

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High pitched whine in engine. Really really bad on acceleration. Alternator??


My 2002 Chevy TrailBlazer sounded like a jet taking off...it was the clutch fan.

Jun 23, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

93 villager runs good, but temp. gauge runs up to the hot line, but never runs hot. is the a colling fan that should go on.


the cooling fan should come on low speed and then high speed as it gets hotter.

The fan should come on anytime the a/c clutch engages, even cold engine.
3 cooling fan realys in battery box in front of battery. controlled by signal from engine coolant sensor. siganl from engine computer.

go here too

http://groups.yahoo.com/group/villagerquest/

Jun 22, 2010 | 1993 Mercury Villager

1 Answer

Check engine light on....cooling fan over speeds. I replaced the fan clutch and still does the samething...a lot of air noise...specially when starting out / accelerating


Check engine light is part of the solution as the code stored may indicate the malfunctioning sensor.The fan overspeed is a computer generated safety backup for electric fan clutch engagement so the engine don't overheat when the coolant temp sensor malfunctions.

Apr 18, 2010 | 2003 Chevrolet Trailblazer Ext

2 Answers

My trailblazer (2002) was making allot of noise as i gave it gas.


should have the coolant temp sensor replace from the sound of it. if bad it will think it is cold and dump more gas to keep it running. it also runs the fans

Aug 13, 2009 | 2003 Chevrolet TrailBlazer

2 Answers

High RPMs


Check all vacuum lines to make sure they are connected. Your problem may be in the transmission too.

Apr 07, 2009 | 2002 Chevrolet TrailBlazer

2 Answers

TRUCK RUNNING TO COOL


You can purchase a "Hotter" Thermostat for your Truck. Go to any Decent Auto Parts Store and let them know your Problem, They should be able to help Further with this Issue.

Jan 02, 2009 | 1992 Chevrolet K1500

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