Step by Step Chevy Trailblazer 4.2L Water Pump & Fan Clutch Replacement in Under an Hour 

Nice job, this is exactly what makes RU-vid great. People helping other people out. Sure I could fumble through this job figuring it out as I go but why not watch someone else figure out the hard parts and instruct you through it! Thanks man.

Hey man just wanted to say thanks for taking the time to make this video. My son's truck needed this repair and I was low on funds and time. The video was so perfect I not only handled the repair but was able to get out of the Texas heat(112 heat index yesterday) faster. Thank you brother, I want you to know this 20 min thing you did 4 years ago is still helping people tremendously. Thank you for sharing the knowledge and may God bless you sir.

6 foot of snow in the background and short sleeves!!!!! Lol you sir are the man. Thanks for the video! Great job!!

Thank you thank you. You saved me hundreds of dollars. I think I got a quote to replace it for $800. Needless to say I went with the ladder...DIY. Pain in the butt but It was worth it. 🍻

Having no clue how to replace my water pump, Your video was straight forward, which was perfect for me. Replaying this several times, I was able to notch out shroud, replace pump and assemble back in 2 hours, 10 mins. You saved my ass and over $290 in labor. Thank you Sir!

Your wife did a great job holding The camera nice detailed video

Thanks a ton, I went from $350-700 dollar quotes to just ordering the part online and following this video step by step. Cost me a total of $45.

GREAT, video, thank you! BUT it’s 35 INCH pounds and then 89 INCH pounds for those small 10mm head water pump bolts to block You’ll break or strip them if you use FOOT pounds

You don't have to tighten the big fan nut. It will self-tighten when the engine starts. It won't unscrew or fall off when you shut the engine off. It'll be just fine.

I notched out my fan shroud in a parking lot with a sheet wall knife for anybody unable to get to a sawzall. Putting that there was a GREAT TIP. Thank you

Good job. My partner and I now just replace waterpump without removing shroud. It is not to bad. Got it down to 1 hr.

Steve - Excellent video. Very detailed and time saving. Why did you replace the Fan Clutch was it bad or is it just a good time to replace it when the water pump goes bad? Thanks again this is going to be big help.

Sir you a damn Genius I wrestled with my fan shroud for 20 minutes trying to get it out to change the water pump after seeing your video I get to Sharon out of the Envoy I went out and cut mine

DO NOT Torque Your Water Pump To 89 FT LBS!!!! 89 IN LBS

there's no need to cut the shroud, pull up the driver side first so the fan clutch assembly clears the pulley then tilt the shroud towards the engine, you'll have to wiggle and finesse a little until the shroud is clear of the power steering lines.

THANK YOU FOR THIS VIDEO! wish I would’ve seen it a year ago when my water pump and radiator pooped out on me, would’ve saved me from being miss spaghetti arms and many hours lol. This job only took me about an hour and a half and saved me $450+! Thank you again :)

Thank you for the very informative lesson. I did exactly what you told me & how to cut the U shape cutout & trust me it definitely saved a lot of time. I had the job done within 45 minutes . I owe you a a few ice cold beers . THANKS !!!!!!

Great video. Excellent positioning and descriptions. Awesome tool description too. I caught the 10mm water pump bolt tightening mistake but that was the only one. I usually dont need a torque wrench anyways. 89 ft ponds is way too much. haha Id say 25 ft pounds is good. Thank you my good man.

Just want to say thanks for this video! Well done. Dealership wanted $700 for this job. I replaced water pump $88 AC Delco, $25 belt, plus antifreeze. Thanks! I did notch the shroud to allow clearance past the radiator neck. Pulled both the shroud and clutch fan together straight out with no problem. THANKS!!

My friend you are trippin you did not save an hour making those cuts😂 if anything you wasted time brother

Thermostat on these are a pain

Great video . Prior to me watching , I was surely going to let the professional do it. Dealing with removing the radiator,,I DIDNT WANT TO DO. After seeing how you cut the cover , Bam! Too easy. I didn’t have that cutting tool you have. Instead , I drilled a hole on each side of the cover (upper radiator) then took for tin snips and cut. Great video . Thanks !!!

Excellent, straight forward video. As a single mother in nursing school, you just saved me so much money. SO grateful people make these kinds of videos. Thanks Steve (and Steve's wife the videographer !)

If you're worried about the hole in your shroud affecting cooling performance, Gorilla Tape works very well to patch it up when you're done, and it blends in with your shroud so it doesn't look too bad!

Most thorough video I have ever watched. Changed mine out just as easy...thanks the that cut trick. Thank you so much for posting. Was quoted 500$. Did mine for 65$

Thanks sooooo much, great video! Extremely helpful

Definitely Doing It THIS Way I Am Not Tryna Remove The Fan Clutch From The Fan To Remove The Shroud

Thank you for your video, just did my girlfriends truck with no hassle. Good video!

My water pump blew out when I was on the high way and threw and shredded my belt on me. I figured it was the water pump because the massive hole in the front of it. Thanks for a step by step on replacing it.

Thank you very much for the video helped alot got the water pump done less than 3 hrs 👍😁

The best ,the best video,hey guys doing videos how to repair cars or trucks this is the way to do videos “I called waste of time videos “the others and gracias Señor you did it GREAT VIDEO

Hey @Steve Young thanks for all your Trailblazer videos. I have an 02 TB that I need to change water pump and fan clutch on. How's the Dorman working out for you? I have read a few reviews that the fan runs on high speed all the time. Stating that I should go OEM. Problem is OEM costs an arm and a leg. I don't trust the stuff on EBAY to get one. The OEM part on Rock AUto says it comes with sensor. What stinkn sensor is that?

Doing this in 2023, and appreciate the DIY manuel. After 300$ spent on a new fan clutch and water pump, waould rather do the work than pay an hourly fix it rate.😂😂😂

I replaced the water pump yesterday on my 2005 Chevy Trail Blazer. I just tapped the big nut of the fan clutch and used a long screwdriver wedged between the pump pulley screws to loosen it. Thanks.

Much appreciated. Helping my brother do this next month. To the point with great tips and good angles. Thanks again

Great video - one small correction, in the video you said do the final torque of water pump bolts to 89 ft/ pounds and it should be 89 inch/ pounds. Pretty sure 89 ft/pounds would strip the bolt and then you have a nightmare situation.

Well done explain to everything slowly and perfectly thanks I have some friends that said it was going to cost over $4,000 so I will give them your video save them a lot of money they're just getting married

thank you very much for your video, but could you provide me with the torque specifications for the 3 parts? and could you provide me with the measurements of the tools that I will need? first of all, Thanks

Thanks Steve! Tom from Ohio. 2005 Envoy. Not an issue yet , just planning ahead so I'm ready to go.... if/when it does fail

Excelente, muy buen trabajo paso a pasito muy despacito, esplicado detalladamente y con las herramientas nesesariss, nada es difícil, gracias por compartir, buen día.

Wow! great video, thanks for the very clear step by step instructions.

Very nice video... Nice job of video and narration.. Great tip on the shroud cut as well.. Cheers..

I’ve owned 2002 and 2004 Chev Trailblazers and neither one had a water pump last 100,000 miles.

The if you don't want to cut the Shroud you can lean the radiator Forward if you pulled the radiator crossmember bolts . it takes more time but if you're doing it for someone else it looks more professional

Thanks for this video brother and for taking the time to show us the right way to do the job !! I change it two years back and took about 3 hours , this time took me 45 mins

Thanks for the video helped me so much thank you man god bless you

Great video!! Thank you for putting this information out. I have a 2005 Trailblazer with the same problem, but I'm not sure if I have to replace the fan clutch or not.

My problem was the radiator cap wouldn't release the pressure blew the ceal in the pump then after replacing the pump I had over heating issues replaced the thermostat still over heat replaced the water sencer still over heat the cap was really tight to get off It finally broke put a new one on all my issues are gone so check your cap it should remove easily if not replace it save a ton of money and agrivation

excellent demonstration. only thing i feel would have worked better was to take the lower rad hose off and just drain all the coolant from the radiator. chances are the average trailvoy owner hasnt touched their coolant in years and this is a perfect time to replace and/or flush the coolant. other than that, brilliant job

don't need to cut shroud should have enough flexibility in the plastic I did the job with a little flat bar between the radiator neck and shroud plenty of room and less time than it took to watch the video

Awesome video. thank you. I'm about to tackle my 02 Envoy water pump.

Great instructional video, simple and straight forward.

Took mine in for an oil change and they told me the water pump is loose and about to fall off the engine. They wanted $648 to fix it

AcDelco w/p and Behr fan clutch is best combo for me....

Great Job man!! ill be doing this repair this weekend and I'm completely confident I can do this. When you made mention of the cut out on the fan shroud I was thinking "fucking Right!" Thank you for this video ! Again great video ! to the point not too much talking and bullshit and you obviously know your stuff!!

According to the GM Trailblazer Chilton Repair Manual: * Apply a thin layer of RTV sealant to both sides of the new water pump gasket * Torque specs - Fan Blade Bolts 20 ft. lbs - Water pump mounting bolts 6 cylinder 89 inch lbs - Water pump pulley bolts 18 ft. lbs. you're welcome

I remove the lower one first, then remove the upper one, tilt it while still connected to motor so any remaining coolant drains in it, pull hose out with no coolant in it

*watching RU-vid how to on timing* "you'll need a 10 mm socket" *Throws phone*

Thank you for posting this video I could not figure out the tool to use to hold us fan clutch in place they have a room tool at AutoZone and it was a piece of you know what what's your video was straight to the point thank you again

Steve you ROCK buddy! I just have 1 problem I ran into. The pulley is stuck onto the water pump. Bolts came out easy but the pulley won't budge. Can you help a fellow New Hampshire home mechanic? Live Free or Die!

I took the shroud out on a 2003 envoy...i dont remember how i did it...but i didnt have to cut the shroud.

Just got the vehicle and going to fix water pump but is it okay if my heat works on 4 for this? 5 doesn't. Low air, probably an actuator, tyvm

I replace my just like you said in the video but now my truck don't want to crank

Great job on how to video liked the short cut trick cutting notch on fan shrould.Great time saver.thanks for sharing the info.BILL PENN PHILA,PENNA

Thanks for the "cut" tip. I have that shroud & fan ready to pull out but I couldn't force it past the radiator neck. I jumped onto this video and found your great solution.

WARNING!!!!! he says 89 foot pounds, that should be 89 inch pounds. Don't break your bolt like I did with that measurement.

This video was very good. Keep up the good work

The notch is a good idea. I was told to cut the shroud in half but this is way better thanks

What brand of water pump & fan clutch would you recommend ?

Ok but did you leave the pulley bolts fan tight

Just changed my water pump, couldn’t have done without this video. Thank you

@Steve Young GREAT REFERENCE! I did this job yesterday and the Thermostat and ECT Sensor and this helped a lot! My tip to all is: if everything goes smooth except getting those damn Trans cooling lines back into their slots- you can take a Dremel tool and trim them down and it will fall into place like butter PLUS the cooling lines will still sit where they belong..they just wont "snap" into place but will have support. Once again EXCELLENT reference for doing this job correctly! Also, I believe the giant clutch nut wrench is size 1 7/16(Item #25193) ordered from Ace hardware.

Bro how can I send you some beer money this video just made my life so much easier. My Trailblazer will finally pass inspection again after two years.

Question..... If it can blow the seal... Can it's water leak in the engine oil? Edit: hmm yeah I thought not it would have made sense to me if that's the problem with the one I saw

Was fan church bcad way did you repace it!

An old butter knife and a propane torch made the cut perfectly.

Watched your video today and was able to knock it out just as you did. Never worked on a car before. Your tutorial made my experience painless. Thank you.

Thanks for walking me thru the process as we speak lol 👌

Can anyone tell me if this applies with a 2002 trail blazer

I just did my trailblazer. I was thinking about cutting my shroud, that was pretty tough. (Used a pry bar). I laughed when I saw your Multi tool

Thanks so much. One of the easiest way to get through.

You're going to wipe out that motor with that sandpaper

Thank you, Steve. That was a really good video start to finish. I like the shroud cut-out tip. Good instruction/explanation as you went.

144k people have been helped by this video. Nice

Thank you for the step by step tutorial now I can do it myself and save some money 👍

Hey bud 35 inch pounds and 89 inch pounds.. NOT FOOT POUNDS. I'm sure someone caught that before breaking bolts.. 👍👍

89 ft lbs?? Might need to check that....

My trailblazer broke down on the way to work. Limped it to my nearest auto parts store and changed it right in the parking lot. My belt was shredded and truck was heavily smoking haha . But you helped…. A TON.

Thank you! My Chilton's showed about the same process. Video helps 100% . Makes me wish it was my old '70 350ci now that was Simple!!

Are all the gaskets the same on every 4.2?

How did you get the nut/bolt disconnected?

Awesome video THANK YOU !!!! so much .The best video .Im just learning to work on these newer cars .I feel more confident to do this job .I'm great at working on my 55 Chevy but these newer cars are confusing ,I guess its just getting with the program .Again thank you very much.

Any tips on getting the fan clutch nut free? Really Rusty. Used aero kroil. Tried heating it up and I still can't bust it.. thinking about cutting it on the stem and just replace the water pump with new fan clutch.. thoughts?? Thanks

Brilliantly done. Thanks!

Great job and thanks so much for posting this. Have not worked on cars in about 30 years, but this makes it easy to go ahead with it. One question, not familiar with the "Hold tool" with the Red handle. Do you feel this is a necessity for this job?

I broke my water pump bolt 10 mm inside how can I fix that problem.

pulled radiator, did less 2.5 hr. fan nut was worst part, no special tools. no torque wrench. 👍

Good video, thanks for posting. Shroud cutout hack looks like a real time saver. I will definitely go this route.

Thank you for taking the time to do this

Great Job! 👍