Question about 2003 Chevrolet TrailBlazer

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Replaced thermostat now ac wont work 2003 trailblazer heat stays on

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  • 645 Answers

The thermostat is under the alternator. Remove Neg. battery cable, positive cable from alternator. Remove Alternator, drain radiat
if it can't help you i think you should buy a diagnostic tool and make a diagnostic by yourself or you can do it in a garage. there are a lot of good tools here: chinasinoy.com
hope it can help you!
cheer!

Posted on Nov 05, 2012

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Posted on Jan 02, 2017

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michigan man
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SOURCE: replace feus for breackligths on trailblazer 2003

check the brakelight switch on top of the brake pedal first and if that does not fix it then check out the fuse link and ground and here is a place for GM parts if needed Schram auto and truck parts 1-800-292-1032

Posted on Mar 08, 2009

  • 1 Answer

SOURCE: lowbeam light wont work

check the headlight relay

Posted on Mar 27, 2009

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SOURCE: i have 2005 chevy trailblazer heater wont work,

Sounds like your water pump is going out or your thermostat is stuck. Check the thermostat first and make sure it is not frozen in the clsed position.

Posted on May 08, 2009

  • 651 Answers

SOURCE: need instructions on replacing thermostat on a

the best i can do for you is to tell you to purchase a haynes repair manual at a local auto parts store. about 17$. it'll give you exact instructions.

Posted on Jul 01, 2009

SOURCE: 2003 trailblazer loss of cruise control and ac fan

for parking brake and abs check for parking brake switch operation, for abs check with scan tool for any trouble code, for your cruise control unit check for any broken vacumm hoses on the engine, for the ac fan, check the fan motor, relay or fuse.

Posted on Jul 16, 2009

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2 Answers

2005 chevy trailblazer ac won't work but defrost does while driving only


Hi. There happens to be a common problem with these trailblazers inside the ducting box located under the dashboard. The mode actuator door motor stops working due to a faulty motor itself and the default position is defrost only. As far as the Air Conditioning not working, there maybe another problem to diagnose there. Could be low refrigerant, or electrical problems to the compressor, or faulty fan clutch(another very common problem with these trucks). Type in mode actuator door and 2005 trailblazer in your search engine online i.e. Google or Yahoo and you will find many posts about this problem. I think there may even be a Youtube video about replacing it. Let me know you need more help. Thanks.

Aug 08, 2012 | 2003 Chevrolet Blazer

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I have a 2003 trailblazer EXT LT. the front AC/ Heat controls work when they want to. they fan will run after the car has been turn off for as much as 3 hours. or it will not work at all. I checked the fan...


If you have automatic climate control, replace your blower control module, behind the glovebox.
If it's manual, replace blower motor resistor assembly, same location.

Feb 15, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

Bad Clutch Fan? Rear ac/heat don't work front only works on 4


The fan clutch isnt engaged at all times, therefore it may be normal to hold it in place (not recommended). On these trailblazer's 4.2L engine the fan clutch is electronically controlled. Usually when this vehicle's fan clutch malfunctions, there is a random ticking noise while idling or at a stop, also the "service engine soon" may turn on. As for the the fan speed problem, this may be a faulty blower resistor malf (typical) or climate control unit may be faulty. Hopefully this helps!!

May 05, 2010 | 2003 Chevrolet TrailBlazer

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Replacing a 2003 chevy trail blazer thermostat


if this is on a 5.3l the thermostat is on the lower hose. you will probably need to remove both belts, and possible the tensioner for the ac belt to get good access.

Dec 19, 2009 | 2003 Chevrolet TrailBlazer

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2003 Chevy Trailblazer my AC blower won't turn off!


you have a short to power which will cause it to stay on constantly check your blower motor resistor pack to ensure that it is working and check the wires going to the blower to make sure you have a power and a ground

Jun 29, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

I have 2005 chevy trailblazer heater wont work,


Sounds like your water pump is going out or your thermostat is stuck. Check the thermostat first and make sure it is not frozen in the clsed position.

Mar 10, 2009 | 2005 Chevrolet Trailblazer Ext

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