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Thread: Thermostat won't fit!!!
03-27-2009, 12:08 PM #1
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.
03-27-2009, 01:12 PM #2
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.
03-27-2009, 01:29 PM #3
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.
03-27-2009, 02:00 PM #4
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
97 Suburban K1500
3" Body lift
2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
35" Yokohama M/T's
Airraid Throttle Body Spacer
03-27-2009, 02:11 PM #5
03-27-2009, 02:21 PM #6
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
33" BF Good A/T
Cherry Bomb Turbo
Cobra CB w/
Dual Fiberglass Antennas
01 Kawasaki KLR650
03-27-2009, 02:23 PM #7
Would it be possible that a thermostat from a 98 K1500 fit??
03-30-2009, 12:41 PM #8
03-31-2009, 05:12 PM #9
04-01-2009, 11:46 AM #10
Have been way too busy to try anything, but when I do I will post what the outcome was.
Again...thanks for all the input.
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