How to replace water pump (pics) - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > The 02-09 "How-To" and DIY Section

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  #1  
Old 03-18-2010, 10:06 PM
blbkabenvoy's Avatar
blbkabenvoy blbkabenvoy is offline
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2003 GMC Envoy SLE
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How to replace water pump (pics)

Lots of informative information has been learned from this site. Figured I would contribute.
03 Envoy. 106k. Had Fan clutch replaced once. 2nd Water pump.
Started hearing a grinding in the front. Fan and water pump pulley could be moved around by hand.

Total time 30 Minutes. Didn't drain coolant. Just used a catch pan.

1. Engine bay shot of water pump hidden. Ugh... (LEAVE BELT ON)

2. Remove radiator cap to relieve any pressure.

3. Remove upper radiator hose.

4. Remove both lower transmission lines and 1 of 2 10mm radiator fan shroud bolts.

4. Remove 2nd 10mm radiator fan shroud bolt. Disconnect black clip for fan clutch.

5. Make sure hood is propped up nice and high. I used a pry bar and wedged it. Get an open ended wrench to fit the fan clutch bolt. I used a 1 1/2". (Those specialty tools are junk). Its a little bigger, but all I had. Still worked fine.

6. Make sure the wrench is clear of the 4 water pump pulley bolts and fan.

7. Get a firm grip on the wrench, and take a hammer and smack it 1 good hard time to bust the nut loose. Make sure the hood prop is not up.

8. Spin nut off and press in on fan to lift over the threaded end. Continue to lift upward on the fan and shroud at the same time to remove as 1 unit.


9. You might hit the radiator neck, just press shroud towards engine on passenger side and continue to lift.


10. Once removed, loosen (do not remove) the 4 13mm bolts holding the pulley. (LEAVE BELT ON)

11. Remove belt out of the way, and finish removing bolts from pulley, and remove.


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  #2  
Old 03-18-2010, 10:07 PM
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blbkabenvoy blbkabenvoy is offline
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2003 GMC Envoy SLE
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12. Remove 5 10mm bolts holding water pump to engine. Prepare for coolant spillage.


13. Remove water pump, and clean old gasket material. Install new gasket and water pump.


14. Install 4 bolts back onto water pump pulley hand tight.

15. Install Belt

16. Snug bolts down

17. Start and check for leaks. Now is the time to replace the fan clutch if necessary. Check engine will illuminate until fan clutch is reinstalled.


18. Kids in the backseat watching a movie. Only 20 minutes into it.

19. No leaks, Great! slide fan shroud and fan back in as 1 unit. Wiggle around the upper neck until it seats back. Press in on the fan until it goes back over the threads of the new water pump, and tighten back down spinning the nut clockwise. Adjust the fan shroud for the proper alignment. MAKE SURE THE 2 LOWER TABS ARE PLACE BACK IN THEIR POSITIONS!




20. Take the hammer back out and give the wrench 3 good smacks back clockwise to tighten nut.

21. Attach 2 10mm bolts back to upper shroud support.
22. Attach 2 transmission lines back to shroud on passenger side.
23. Attach black fan clutch connector on drivers side.
24. Attach upper radiator hose.
25. Start vehicle and let idle. Refill coolant at radiator checking frequently.
26. Put radiator cap back on, and rinse down excess spillage with water.

Total time 30 minutes.
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  #3  
Old 03-18-2010, 10:21 PM
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Now, that's a nice write up !
How did you keep the camera clean?
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  #4  
Old 03-18-2010, 10:37 PM
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RedEnvoyDenali RedEnvoyDenali is offline
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Great Job, always nice to pics and even nicer to have words to describe what is going on

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  #5  
Old 03-19-2010, 10:05 AM
rmsg0040 rmsg0040 is offline
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can somebody sticky this please.

Step 25, where did u refill coolant, at the resevoir tank or at the cap, by the rad hoses?
Step 26, why did u rinse down with water?

I like the x beam wrench. Good writeup and nice pics. Very useful.
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  #6  
Old 03-19-2010, 01:51 PM
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Great writeup

step 14 Hand Tight should be in RED

Also why is your fan white?? Just wondering
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  #7  
Old 03-19-2010, 02:32 PM
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Very Informative! thanks!

Quote:
Originally Posted by trailballer View Post
Great writeup

step 14 Hand Tight should be in RED

Also why is your fan white?? Just wondering
Looks fine to me lol
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  #8  
Old 03-19-2010, 05:07 PM
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blbkabenvoy blbkabenvoy is offline
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Quote:
Originally Posted by wcosh View Post
Now, that's a nice write up !
How did you keep the camera clean?
My blackberry works better dirty

Quote:
Originally Posted by rmsg0040 View Post
can somebody sticky this please.

Step 25, where did u refill coolant, at the resevoir tank or at the cap, by the rad hoses?
Step 26, why did u rinse down with water?

I like the x beam wrench. Good writeup and nice pics. Very useful.
Filled at the radiator. Resivoir didn't go down much.
Rinsed off excess coolant on bottom skid plate.

Quote:
Originally Posted by trailballer View Post
Great writeup

step 14 Hand Tight should be in RED

Also why is your fan white?? Just wondering
Done. Camera maybe? Its an off yellow/white color.
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  #9  
Old 03-19-2010, 06:20 PM
rmsg0040 rmsg0040 is offline
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thanks for clearing up those 2 questions I had.
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  #10  
Old 03-22-2010, 10:13 AM
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Fore V Fore V is offline
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This was of a great help! Thank you!
I am replacing my second water pump (New AC Delco part $112 from GM dealer) (Originally replaced by my mechanic with an aftermarket part) and saved a few $$$. I do realize now that my water pump failure is due to my fan clutch / blades. From the first replacement, the fan blades were damaged (dug into the shroud) making the fan oscillating (Not caught by my mechanic). Therefore damaging the water pump bearings. For $200 I got a used fan clutch with fan and shroud. Not installed yet.
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