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#3225890 - 12/23/13 07:39 PM 05 Chevy Colorado T-Stat change?
Keith_Stone Offline


Registered: 05/22/11
Posts: 298
Loc: NC
Anyone changed a stat on these trucks? Have to remove the drivers side tire and splash guard, it's a side access with the I5 engine. The housing/stat is one piece. I'm getting a P0128 code on cool days with the temp coming up slowly. I'll get heat only after 6-8 miles. Cooling system is full with clean coolant. Guess I've got a lazy stat that won't fully close.
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#3225897 - 12/23/13 07:48 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
Chris142 Online   content


Registered: 06/05/03
Posts: 11053
Loc: apple valley, ca
I have done a few on hummer h3's with that same engine. Not too bad on those, definatly not as bad as the 3.1 and 3.4 stat
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#3225900 - 12/23/13 07:50 PM Re: 05 Chevy Colorado T-Stat change? [Re: Chris142]
Keith_Stone Offline


Registered: 05/22/11
Posts: 298
Loc: NC
I understand one of the 10mm bolts is hard access. Will I need a universal joint and couple of extensions? Does the stat gasket require gasket compound?
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#3225902 - 12/23/13 07:51 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
GMBoy Offline


Registered: 11/22/04
Posts: 6615
Loc: Texas
I am with Chris142 as I also have changed these in both H3's and Colorado/Canyons. Not a bad job.

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#3225903 - 12/23/13 07:52 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
GMBoy Offline


Registered: 11/22/04
Posts: 6615
Loc: Texas
Originally Posted By: Keith_Stone
I understand one of the 10mm bolts is hard access. Will I need a universal joint and couple of extensions? Does the stat gasket require gasket compound?


No, the gasket is an o-ring. No need for anything to be applied to it.

It's been awhile since I did one, but I think I did use a universal socket and you do need an extension for sure.


Edited by GMBoy (12/23/13 07:53 PM)

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#3225904 - 12/23/13 07:53 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
salv Offline


Registered: 04/21/11
Posts: 1116
Loc: Morrisonville, NY
not difficult, but tedious.
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#3225908 - 12/23/13 07:54 PM Re: 05 Chevy Colorado T-Stat change? [Re: salv]
Keith_Stone Offline


Registered: 05/22/11
Posts: 298
Loc: NC
Would you guys suggest a OEM stat?
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#3225915 - 12/23/13 08:02 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
ram_man Offline


Registered: 03/15/13
Posts: 1466
Loc: southern mo
Cant you just buy a t stat? My saturn has the style where the t stat twists and pops into the housing.
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#3225918 - 12/23/13 08:04 PM Re: 05 Chevy Colorado T-Stat change? [Re: ram_man]
Keith_Stone Offline


Registered: 05/22/11
Posts: 298
Loc: NC
I think I read it's one piece.


Edited by Keith_Stone (12/23/13 08:07 PM)
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#3225943 - 12/23/13 08:32 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
Chris142 Online   content


Registered: 06/05/03
Posts: 11053
Loc: apple valley, ca
Its a 1 piece stat and housing so you cant just buy the stat. The oe ones seem to be failing often. We have been using aftermarket ones and so far they are not any worse than the oe.
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#3226057 - 12/23/13 11:02 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
crazyoildude Offline


Registered: 07/23/08
Posts: 5163
Loc: new jersey
get it from the stealer they are better sometimes its better to get oem forget that you will be paying 40%-50% more if its not good there goes your engine

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#3226323 - 12/24/13 09:38 AM Re: 05 Chevy Colorado T-Stat change? [Re: crazyoildude]
Keith_Stone Offline


Registered: 05/22/11
Posts: 298
Loc: NC
I found this tutorial on the stat change. Should I retain the oem clamps or replace with regular screw style?
http://www.355nation.net/forum/how-performance-maintenance/68410-how-changing-your-thermostat.html
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#3226879 - 12/24/13 09:47 PM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
GMBoy Offline


Registered: 11/22/04
Posts: 6615
Loc: Texas
I bought one for an H3 on Rockauto - AC DELCO that was cheaper even with shipping then the Autozone part.

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#3227007 - 12/25/13 05:00 AM Re: 05 Chevy Colorado T-Stat change? [Re: Keith_Stone]
George7941 Offline


Registered: 05/10/05
Posts: 1460
Loc: Toronto, Canada
I have had the OE GM and one RockAuto Delco replacement stat fail, so last time I got the Stant stat from RockAuto and the Stant seems to be holding up well. So at least on the 4.3l engine, my advice is to avoid the Delco stat.
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#3233227 - 12/31/13 08:41 PM Re: 05 Chevy Colorado T-Stat change? [Re: George7941]
Keith_Stone Offline


Registered: 05/22/11
Posts: 298
Loc: NC
Changed the stat yesterday. Much to my surprise the stat was fully closed. However in a hot water test it started to open at only 158. I now have a normal temp gauge reading and the P0128 did not reappear. I had 196 near the coolant sensor when checked with my IR gun.
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