Fan Clutch or Water Pump?? Please help Thanks - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

TrailVoy.com is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools
  #1  
Old 01-09-2008, 01:51 PM
exvetteowner exvetteowner is offline
Junior Member
 
2004 GMC Envoy SLE
Summit White 4.2L I6 AWD
Join Date: Jun 2007
Location: Gadsden, Al
Posts: 40
Fan Clutch or Water Pump?? Please help Thanks

For the past month or so I have noticed a "Ratteling" underhood at cold startup. Sounds a lot like a bearing seperating. I looked for it and seems to be comming from the fan or water pump. 2004 GMC Envoy, AWD. 4.2 engine.
I set an SES and was told that it was indicating a "Problem" with the cooling fan. I can stop the fan with my bare hand when it is at idle and pull up or push down on the fan and make the noise better or worse depending on how much force I apply. When I turn the engine off I can move the entire fan and clutch assembly and water pump pully up and down at least 1/4 inch, maby more. Is this "normal" for this engine? I have never seen a water pump pully that would do this...I checked clutch prices after reading a lot about this problem and found a AC Delco for $232.00...my friend at the dealer says it is a 2 to 3 hour job to replace the clutch...blasted electrical fan clutch...man! GM's is going to hell in a handbasket! I am through with GM if they don't start owning up to these design flaws that cost us, the consumer, thousands of dollars...NO WAY should the fan clutch or water pump be going bad at 70K!!!! Everyone who has had this problem should be reimbursed for their TIME and MONEY spent. I bought GM product in 04 because I wanted QUALITY...Not another piece of JUNK...like the 2 FORDS I owned.
My question to everyone is...if I do nothing now will the clutch cause a major problem? Or will it eventually lock up and cause the fan to engage fully? Any input from you guys will be appreciated. I am retired trying to make do with a fixed income and it is getting harder to make ends meet...I know I am not the only one in this predicament...Thanks to all who offer any advice.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 01-09-2008, 03:40 PM
rbarrios's Avatar
rbarrios rbarrios is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
it sounds like your problems is the water pump.
when stopped, you can grab the fan/clutch and it should NOT move left or right . up or down.
My water pump failed at about 47K... on a long road trip, it started making a little noise.
as I traveled Id pull over at rest stops and eventually found rubber shavings on the engine.
turns out the bearings on the water pump started to fail. allowing the fan to wobble in the water pump shafts axis. this wobble cause the serpentine belt to rub on one of the pulleys... thus the small rubber shavings... essentially it was wearing the side of the belt....
in phoenix the wobble got so bad- it shook the truck. I pulled into dealer and had them fix it.
my recommendation....... since the pump will be replaced and the fan clutch HAS to be removed to get to the pump.......
if you have not changed the clutch.......... BUY one from EBAY....
they are WAY cheaper.... I think some members on here have gotten them for about $70!!!! and make sure they are the latest part # and new.
then you can replace the pump.... and change the Serpentine belt.. About $30 for that.
__________________
2013 Equinox-3.6L DI- Best MPG 35
2010 Traverse-3.6L DI Best MPG 31.3
2003 Trailblazer LS 165,000 miles- Best MPG 24
Reply With Quote Quick reply to this message
  #3  
Old 01-09-2008, 03:46 PM
rbarrios's Avatar
rbarrios rbarrios is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
to answer your other question.....
the fan clutch may fail- and be stuck in the FULL ON position..
this wall cause you to have a roaring sound/ pulling alot of air...
mileage may decrease some.. and you may feel like the vehicle is heavier/shift a little different...
but you will be able to drive the vehicle.

The major concern is the water pump and the failed bearings....
with a fan clutch wobbleing like that, the concern is a clutch and fan moving around violently.... and possibly breaking off... Ive never seen it happen but with a mass like that shaking like that???? its possible... it could then break off and damage stuff on that area, hoses, radiator etc...

what is more likely to happen... is the water pump may develop a leak....
you leak antifreeze- and you could risk overheating engine....

Id really consider an ebay clutch- and getting the pump replaced ASAP- kill 2 birds with one stone- and save on $$$, since the CLUTCH MUST come of to get the pump out.
__________________
2013 Equinox-3.6L DI- Best MPG 35
2010 Traverse-3.6L DI Best MPG 31.3
2003 Trailblazer LS 165,000 miles- Best MPG 24
Reply With Quote Quick reply to this message
  #4  
Old 01-09-2008, 03:48 PM
rbarrios's Avatar
rbarrios rbarrios is offline
TrailVoy Guru
 
2003 Chevy TrailBlazer LS
Pewter Metallic 4.2L I6 2WD
Join Date: Sep 2004
Location: west covina
Posts: 5,267
just checked ebay... theres ALOT of fan clutches on there..
prices are in the $115 to $140 price... shipping would be additional..
but way less than the dealer.
__________________
2013 Equinox-3.6L DI- Best MPG 35
2010 Traverse-3.6L DI Best MPG 31.3
2003 Trailblazer LS 165,000 miles- Best MPG 24
Reply With Quote Quick reply to this message
  #5  
Old 01-09-2008, 03:58 PM
superman_79065's Avatar
superman_79065 superman_79065 is offline
Senior Member
 
2002 Chevy TrailBlazer LT
Black 4.2L I6 4X4
Join Date: Oct 2007
Location: Hendersonville, TN
Posts: 941
I replaced my fan clutch in the driveway in about 45 minutes with simple hand tools. 2-3 hours is BS.
__________________
Guns don't kill people...Chuck Norris kills people.
Reply With Quote Quick reply to this message
  #6  
Old 01-09-2008, 10:16 PM
dsiegelson dsiegelson is offline
Junior Member
 
2004 Chevy TrailBlazer LS
Liquid Silver Metallic 4.2L I6 4X4
Join Date: Jan 2008
Location: Long island, NY
Posts: 21
On my 2004 trailblazer, the waterpump went after only 42,000 miles. Changed it myself but it was not easy the first time out. I say the first time because I blew out the new pump the day after I changed it. Turned out the problem was the fan clutch was bad and it was ripping the water pump bearing apart. Reading the boards, looks like many others have had the same problem.
Reply With Quote Quick reply to this message
  #7  
Old 01-10-2008, 08:55 AM
bull-lee bull-lee is offline
Junior Member
 
2003 GMC Envoy SLE
Charcoal 4.2L I6 4X4
Join Date: Nov 2007
Location: Baltimore
Posts: 4
Definitely sounds like the water pump. On these 4.2 engines the fan clutch and water pump are practically mated and with the known problems with the original fan clutch I would recommend changing both the water pump and the fan clutch. You have to take the fan off anyway to get to the water pump. You can a water pump anywhere (Napa, Advance, etc), but I agree with rbarrios that you may want to check Ebay for the fan clutch - much cheaper. The new part number for the GM replacement fan clutch is 25790869.

Superman - how about sharing your secrets to changing the fan clutch in 45 minutes - that has to be a record - LOL!
Reply With Quote Quick reply to this message
  #8  
Old 01-14-2008, 11:32 AM
exvetteowner exvetteowner is offline
Junior Member
 
2004 GMC Envoy SLE
Summit White 4.2L I6 AWD
Join Date: Jun 2007
Location: Gadsden, Al
Posts: 40
Thumbs down Replacing both and the serp

Thanks everyone for the input. I have decided to park the Envoy until I get all the parts I need. I will replace the Water pump, fan clutch and while I have it so accessable the Serp belt too. I got to thinking...it is probably the Clutch AND water pump going out. I do Believe that the two are mated togother and if one starts giving problems and isn't caught in time (my case) then the other is excepted to additional stress and will make it go out as well (water pump). I really wish that we ALL could go in together and maby get GM to recognize their design flaw and pay everyone who has had this problem.
They (GM) did the same thing with the C-4 2nd generation Corvette when they had Mitsubishi design and build a distributor that mounted UNDER the water pump at the front of the engine. If one drop of moisture formed inside the distributor it would go out...a small leak at water pump, hose burst or worst of all, if you detailed the engine and washed it...well a distributor replacement at over $400.00 a pop just for the part. I replaced so many of them on my '92 and later a '96 and several of the local Vette owners, I had mechanics calling me to get me to come to their shop to do replacements. I know of no one who owned the C-4 1992 and up who did not have the problem. But GM laughed at us all the way to the bank.
Looks like they are doing the same thing on the TrailVoy.
And so it goes.....
Reply With Quote Quick reply to this message
  #9  
Old 01-14-2008, 11:59 AM
exvetteowner exvetteowner is offline
Junior Member
 
2004 GMC Envoy SLE
Summit White 4.2L I6 AWD
Join Date: Jun 2007
Location: Gadsden, Al
Posts: 40
When I am through I'll post more

When I get through with the fan clutch and water pump I will let ya'll know what I found. I expect to find WP bearings all to pieces and the clutch to have a bad sensor. This is the first time I have torn down this area of the 4.2 engine so I expect to see a lot of things I did not know of. This engine was supposed to be a Re-Designed version of the old 250 inline 6 that gave Us and GM years of trouble free service. My Dad has an old 1980 with this engine and with over 300K still runs decent. Oh for the Good Old Days when a set of plugs and points was a 20 minute job and would cure most all our ailaments....aaaaaa
Reply With Quote Quick reply to this message
  #10  
Old 02-09-2008, 11:29 AM
chevy350 chevy350 is offline
Junior Member
 
2003 Chevy TrailBlazer LT
Majestic Red Metallic 4.2L I6 4X4
Join Date: Apr 2005
Location: Canada
Posts: 6
I replaced my water pump in 1 h 15 min (including test drive) outside in middle of winter so yes it can be done by human in less than 2 hr
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fan clutch 101 GMT 360 OEM Issues 355 02-26-2014 01:33 PM
service bulletin# 060602003 bcslvrss OEM Issues 11 05-28-2009 07:17 PM
Water pump stuck to fan clutch?! jacquiluberto OEM Issues 9 08-18-2008 08:42 AM
need fan or water pump help fast garrettbowman OEM Issues 13 03-29-2007 03:56 PM
Water Pump or Fan Clutch chipper 02-09 Vortec 4.2L I-6 Engine and Drivetrain 21 01-02-2007 10:32 AM


» Sponsors

Advertising Info

All times are GMT -4. The time now is 08:19 AM.


Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed