GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1
    Sr. Mechanic sc99z71's Avatar
    Join Date
    Feb 2007
    Location
    Moncks Corner, SC
    Posts
    160

    Angry Thermostat won't fit!!!

    So I go to Advance Auto Parts to get everything I need to flush and fill the radiator as well as change out the thermostat while it was empty. After draining the coolant I get the old thermostat off and try to put the new one on and it wont fit. Anybody else have this problem? I jumped on my motorcycle while I still had it off to go see if Advance had an optional one that may fit and they said this was the only one they had listed for this truck. I then went to Autozone and O'Reilly's and theirs was almost exactly like the one from Advance. Can anybody help? If you found one that fits where did you get it from? By the way its for a 99 Silverado 1500 w/ 5.3L.

  2. #2

    Default

    Couple things

    There should be a MM measurement stamped on the thermostat somewhere like 54mm or something like that. Just get the thermostat that has the same measurement.

    If there is a gasket usually there is a rubber bump that sticks out 1-2mm. That has to be lined up with the dent in the thermostat housing for a proper fit.

    Hope this helps.

  3. #3
    Master Mechanic Dr_Zero's Avatar
    Join Date
    Mar 2006
    Location
    Sunny Florida
    Posts
    706

    Default

    Did they sell you one with a black gasket stuck on to the thermostat?

    The old style was like that and if you pull off the black ring it might fit cause when I look it up the newer models show a different style O ring gasket.


    Ummm dumb question time but since I have never owned a 5.3 is it supposed to come off the housing?

    They sell it as one piece ????

    (Curiosity has got me now so I called the local advance and gave them the info you posted for the truck and they dont even carry that thermostat.)

    Last edited by Dr_Zero; 03-27-2009 at 01:44 PM.

  4. #4
    Jr. Engineer
    Join Date
    Jan 2009
    Location
    Rochester, MN
    Posts
    231

    Default

    Are you sure they are looking up the new body style 99 Silverado and not the 99 K1500? Maybe ask them if they have one for a 2002 Silverado 5.3 and see if they come up with anything different.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  5. #5
    Sr. Mechanic sc99z71's Avatar
    Join Date
    Feb 2007
    Location
    Moncks Corner, SC
    Posts
    160

    Default

    I watched them look up the info for the truck to make sure they were not looking at the K1500, and they did pick Silverado 1500. They even looked themselves to see if the same part number came up for a 2002, and it did. Yes they do sell it as one piece with the housing and all. The old thermostat that was on there was actually two pieces and the thermostat popped in with the rubber gasket. The one they sold me was one piece meaning you could not take the thermostat out of the housing. I might have to go to the dealership for this one. Thanks for al the replies...

  6. #6
    Master Mechanic Dr_Zero's Avatar
    Join Date
    Mar 2006
    Location
    Sunny Florida
    Posts
    706

    Default

    Quote Originally Posted by mjalstad View Post
    Are you sure they are looking up the new body style 99 Silverado and not the 99 K1500? Maybe ask them if they have one for a 2002 Silverado 5.3 and see if they come up with anything different.
    Hmm same part number

    Stant Thermostat/Water Outlet Assembly Part No. 14298

    http://shop.advanceautoparts.com/web...S_699602784___

  7. #7
    Sr. Mechanic sc99z71's Avatar
    Join Date
    Feb 2007
    Location
    Moncks Corner, SC
    Posts
    160

    Default

    Yes that was the part number at Advance Auto, and I tried fitting that thing every which way but backwards and it just would fit. The part that was keeping it from fitting wasn't the housing. On the thermostat from Advance the actual thermostat is held in the housing with braces that come off the housing to hold the thermostat, those braces are what was keeping it from fitting. If you look at the pic a few posts up it is the wide metal piece that is coming about halfway down the thermostat.
    99 Silverado 1500 Z71
    5.3L 4L60E Tranny
    TransGo Shift Kit
    2.5" Rough Country
    Suspension Lift
    33" BF Good A/T
    Cherry Bomb Turbo
    Cobra CB w/
    Dual Fiberglass Antennas

    01 Kawasaki KLR650

  8. #8
    Sr. Mechanic sc99z71's Avatar
    Join Date
    Feb 2007
    Location
    Moncks Corner, SC
    Posts
    160

    Default

    Would it be possible that a thermostat from a 98 K1500 fit??
    99 Silverado 1500 Z71
    5.3L 4L60E Tranny
    TransGo Shift Kit
    2.5" Rough Country
    Suspension Lift
    33" BF Good A/T
    Cherry Bomb Turbo
    Cobra CB w/
    Dual Fiberglass Antennas

    01 Kawasaki KLR650

  9. #9
    Master Mechanic Dr_Zero's Avatar
    Join Date
    Mar 2006
    Location
    Sunny Florida
    Posts
    706

    Default

    Quote Originally Posted by sc99z71 View Post
    I watched them look up the info for the truck to make sure they were not looking at the K1500, and they did pick Silverado 1500. They even looked themselves to see if the same part number came up for a 2002, and it did. Yes they do sell it as one piece with the housing and all. The old thermostat that was on there was actually two pieces and the thermostat popped in with the rubber gasket. The one they sold me was one piece meaning you could not take the thermostat out of the housing. I might have to go to the dealership for this one. Thanks for al the replies...
    Ok called a fellow I know at advance and he said to try one of these out depending on what temp you want

    Stant part #
    13009 190 degree
    13008 180 degree
    13006 160 degree

    and the gasket I think he said was a 35602 felpro

    He said it sounds like you got the old style block

  10. #10
    Sr. Mechanic sc99z71's Avatar
    Join Date
    Feb 2007
    Location
    Moncks Corner, SC
    Posts
    160

    Default

    Thanks for info I will check it out....
    99 Silverado 1500 Z71
    5.3L 4L60E Tranny
    TransGo Shift Kit
    2.5" Rough Country
    Suspension Lift
    33" BF Good A/T
    Cherry Bomb Turbo
    Cobra CB w/
    Dual Fiberglass Antennas

    01 Kawasaki KLR650

Page 1 of 2 12 LastLast

Similar Threads

  1. Replacing the Thermostat for the 5.3
    By Mean_Green_95 in forum How-to Guides
    Replies: 3
    Last Post: 05-31-2010, 04:52 PM
  2. '97 5.7 Thermostat
    By kjb13 in forum General Chevy & GM Tech Questions
    Replies: 5
    Last Post: 10-29-2009, 04:47 PM
  3. The right thermostat?
    By erikshunn44 in forum General Chevy & GM Tech Questions
    Replies: 3
    Last Post: 07-10-2009, 07:10 AM
  4. thermostat
    By scottymac in forum General Chevy & GM Tech Questions
    Replies: 0
    Last Post: 04-29-2008, 11:19 AM
  5. Thermostat??? [Expired Topic]
    By rt1092 in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 2
    Last Post: 02-25-2006, 05:48 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •