Use a 10 MM wrench or socket and loosen the top two bolts holding the fan shroud.
There are two hooks on each side of the shroud that connect to two rubberized pads. Be sure to pull these away before attempting to lift the shroud out. They are located near the bottom close to the radiator.
Disconnect the fan clutch wiring connector located to the driver side near the top of the shroud.
Use a 12" crescent wrench or the correct size wrench (I used a crescent) to loosen the BIG nut on the backside of the fan. Auto zone will loan you a "fan clucth tool"if needed. The tool will hold two of the 13mm bolts holding the water pump pulley while you turn the BIG nut to loosen it up from the pump shaft. If you have an air chizel it will make this even easier. Just angle impact the chizel in very short bursts counter/clockwise on the BIG nut. Once the nut is loose it should spin off by hand. Remember no matter which way you do it you have to hold the water pump pulley stationary while you turn the BIG nut. There are four bolts holding the water pump pulley on. You may be able to hold one of these with a wrench and loosen the BIG nut. I had no such luck. The 13MM bolt would give before the BIG nut every time.
Remove the upper radiator hose from the radiator and strap it up with a small bungee or something similar.
There are two transmission cooler lines connected to the passenger side of the fan shroud. They are just clipped in and can be held back or unclipped as you lift. They are fairly close and don't flex very much so it won't be easy but it it is attainable.
That's it !!! Lift out all together and carefully so you don't damage the radiator.I suggest two people for the lift out. It does make it easier.
Ya so that doesn't work cause of the radiator neck is in the way.... without removing the radiator--(lots of extra work) I actually melted a notch (soldering iron did the trick) in the shroud large enough to remove it past the neck. I have had no ill affects leaving vhe notch there, but you may tape the cutout piece after if you need to. Ya not pretty, but it worked for me!!
location for 2003 chevy trailblazer coolant temperature sensor
Where is the input aux for a 2003 trailblazer
how do you set the clock on a 2003 chevrolet trailblazer
How do I reset the service engine light on a 2003 Chevy Trailblazer?
Where is the neutral safety switch on a 2003 trailblazer?
need help changing the belts on my Chevy trailblazer lt 2003
It pulls off. Sometimes easier to remove the headlight assembly to change the bulb. We have instructions at our forum. www.trailvoy.com Trailblazer enthusiasts!
Specs for main bearings on a 2003 Chevy trailblazer with 4.2 engine .
REMOVE ALTERNATOR FROM DRIVERS SIDE OF ENGINE BLOCK.
No
A eaton fuller 18 speed roadranger gearbox is used
try this website --->www.trailvoy.com<--- they have alot of stuff to help you with your trailblazer i should know im a member my self i have a 2003 Chevy trailblazer Lt www.trailvoy.com