Question about 2002 Chevrolet TrailBlazer

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I need step by step instructions on how to replace a water pump on a 2002 Chevy Trailblazer LT

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For the I6 engine.... Just changed mine last night at 170k. Remove two top fan shroud bolts 10mm, remove electrical connector on drivers side of shroud. Take top radiator hose off of radiator, move it out of the way. Loosen, but don't remove fan clutch to shroud bolts 4ea 13mm. Using a fan clutch tool loosen the big fan clutch nut, take off. Then loosen the waterpump pulley bolts 4ea 12mm. Next, click the transmission lines out of their plastic holders near the bottom of the passenger side shroud. Next take the whole shroud and fan clutch up and out. This is the hardest part, 2 ways to do it to get past the radiator spout. 1- bend the shroud out and pull up. OR Cut notch in the shroud ( I did this) and pull up and out. With whole assembly out, use a 3/8" ratchet and put it into the tensioner hole and move clockwise to relieve pressure on serpentine belt, remove belt. Remove the pulley bolts, then, slowly untighten waterpump bolts and allow coolant to come out through the bottom. Remove pump 5 bolts. Reinstall everything in reverse order. Cutting the notch in the top of the shroud will knock a ton of time off in installation and re-installation. I just scored the plastic with a utility knife, then used dykes, popped right out in perfect size with one cut with the dykes.

Posted on Dec 03, 2015

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  • Chevrolet Master
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Go to www.trailvoy.com and do a search on "how to replace water pump". You will find a thread with a procedure and pictures for the work required.

Posted on Oct 12, 2010

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1 Answer

2002 CHEVY TRAILBLAZER keeps setting a FAN Speed Sensor Code.


CJ, this is very common for the I6 engines in TB's and Envoys. You need a new fan clutch. Triple check the wire connectors first, located on the top of the radiator on the drivers side, make sure those are in tact first. Then replace the fan clutch. Might as well do your water pump and serpentine belt while you're in there.

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2002 chevy trailblazer won't start after changing


A six cylinder Trailblazer does not use a timing belt. It has a timing chain.
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1 Answer

I have a 2002 chevy trailblazer that has a lot of coolant coming out of the water pump does this mean the water pump needs replacement?


Yes it does. It is coming out of the air exchange hole meaning the seal around the pump shaft has went bad. Mike

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2 Answers

How hard is it to replace the water pump. 2006 chevy trailbalzer LT Time to do job?


1 hour if have done them before.If not 3 hours should do it.however you need a special tool to take off the fan clutch from the pump.Caution should be used as not to damage the radiator as it is a tight fit.

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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.

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