Question about 2003 Chevrolet TrailBlazer

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How do i replace the colant temp sensor on 03 trailblazer 6 cyl 4.2 2wd? what parts need to be removed?

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Too lengthy an explanation needed...Go to AutoZone or NAPA and buy a Chiltons repair book ($20)
Good Luck!
Don't forget to replace the lost coolant 50/50 and add water pump lubricant from NAPA, called #13
Good Luck

Posted on Jun 15, 2009


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I have a 2005 Chevy Trailblazer with a 4.2 6 cyl. engine. The car has idle problems. It may stall out at a light. It has hesitation.

Have the charging system thoroughly tested and make sure the diodes in the alternator are good . Make sure all grounds , especially PCM grounds are good . Multiple codes are sometimes caused by bad grounds or charging system interference .

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Replaceing cam shaft position sensor on a 2004 chevy trailblazer . need location

Yellow circled item in picture below (assuming you have the 6 cyl. engine)


Oct 21, 2011 | 2004 Chevrolet TrailBlazer

1 Answer


Switch spark plugs, ignition coils and fuel injectors from cyl 1 to 3.
See if misfire goes to cyl. 3. If that happens replace the damaged part.
If is still on cyl. 1 check the compression of the cyl. 1.
If that's ok see if the air mass sensor is working fine.
Also check if there is oil in the plug of the lambda sensor.

May 14, 2011 | 2007 Mercedes-Benz C230 Sedan

1 Answer

How many quaters of oil does a 2006 chevy trailblazer EXT V6 needs?

2006 CHEVROLET TRUCKS TRAILBLAZER 4.2L 6-cyl Engine Code [S]
LUBRICANTS & FLUIDS: Engine Oil Grade 1......API* All TEMPS...SAE 5W-30 is preferred.
CAPACITIES: Engine, with filter..........6.6 liters Torque: Oil Drain Plug.....19 ft/lbs
Thank you for using fixya and good luck

Apr 07, 2010 | 2006 Chevrolet Trailblazer

1 Answer

I have serv eng light on with code # PO172 , PO128 , and PO442 , and I replaced fuel tank cap today , light still on ,and I need to get inspection , but I am out of work and can't afford expensive repair...

Code p0172 is MAF, vacuum leak, and fuel pressure.
You can see my TIPS on this site to help with the MAF.
Code p0128 is Low ccolant, ECT or the IAT.
code p0442 is your EVAP system.
Please let me know what you find.

Feb 12, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Get code 0128 colant temp low is the colant mixture incorrect

is the temp gauge on dash around 200 if not yoh may have a bad thermostat not letting car get to normal temp

Jan 30, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

2003 Trailblazer Ltz 6 Cylinder Service engine light on. computer said Map sensor and Cooling temp sensor I replaced Map Sensor and Cooling temp sensor will be done tomorrow Car lost all Power going up...

computer said Map sensor and Cooling temp sensor I replaced Map Sensor and Cooling temp sensor will be done tomorrow . No DTC - diagnostic trouble code say's to replace a part , with each factory DTC a diagnostic flow chart or trouble shooting chart is supplied . Checking the electrical circuit , computer etc... before any parts are replaced . From your post i would say your best bet would be to take your vehicle to a qualified repair shop .

Mar 23, 2017 | 2003 Chevrolet TrailBlazer

2 Answers

Tachometer needle on 2004 Trailblaser 6 cyl

it is not a connection problem. The instrument panel will need to be replace and reprogrammed.

Jan 05, 2010 | 2004 Chevrolet TrailBlazer

3 Answers

What is the engine operating temp. for a 2002 chev. trailblazer 6 cyl engine

Most engine operrating temperatures are 180-190 degrees. If the coolant gets hotter it turns to steam.

Dec 13, 2009 | 2002 Chevrolet TrailBlazer

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