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  1. Changed Thermostat, Now Truck Won't Start

    First, if this belongs in a different place, please let me know and I'll move/repost. Last night I replaced the thermostat on my '05 Colorado I-5 following a great guide I found on here and my Haynes manual. The Haynes manual said to disconnect the negative terminal on the battery, so I did...
  2. Running cold?

    I4/I5 Engine & Drivetrain
    I just purchased an 05 Z78 with the Inline 5. Even on the warmest days the temp gauge stays right around the 1/4 mark on the temp gauge. Is this normal for this truck, or should it be getting closer to the halfway mark? I was wondering if maybe my thermostat is stuck open? Any advice would be...
  3. Mini mod meet with radoguy

    Images and Video
    Went over to Sean's (radoguy) place yesterday afternoon. He was changing out his thermostat that was throwing a code for being stuck in the open position. Here's a few pics.
  4. New Thermostat questions!

    I4/I5 Engine & Drivetrain
    So yesterday I did a cooling system overhaul; new waterpump, thermostat, hoses and fresh DEXCOOL. Well last night my Scan Gauge was showing that I was running between 195-200. Did GM change the thermostats? Mine old one would normally operate between 179-186. Was there a change that I was not...
  5. new thermostat, new problems

    I4/I5 Engine & Drivetrain
    bought a stant 180* thermostat b/c mine was stuck open and wouldnt get to temperature. i replaced the lost coolant with 50/50 and added in royal purple ice. i burp the system, let it sit and topped off the resevoir a couple hours later. i got or thought i got a 180* thermostat, but the temp...
  6. Infamous P0128 troublecode - HELP!

    Engines/Performance/Tech Questions
    Long story short. 2006 Colorado CrewCab, 2.8L 4Cyl 85,000 miles Arizona, currently 110° Driving on Freeway Light 'Check Engine' Stop at Autozone to get reading. Got P0128: 1. Check Coolant level. 2 Thermostat defective. 3. Cooling Sensor defective. Temperature above half point (see picture)...
  7. Replaced my thermostat and temperature gauche is going much higher

    I4/I5 Engine & Drivetrain
    Hello I've replaced my thermostat (Canyon 2006 3.5L 4x4) and now the temperature gauche is going much higher, basically 1/2 mark. I got this truck 1 year ago and the gauche always shown the 1/4 mark. should I be concern? is it normal? maybe my old thermostat wasnt working great and this is...
  8. Help! Anybody know were i can find a cold thermostat or performance????

    Engines/Performance/Tech Questions
    If any body knows of a website or store to buy a thermostat for my colorado :d let me know i need a colder one than stock
  9. CEL for thermostat?

    Engines/Performance/Tech Questions
    Ran a quick scan today to see why my check engine light came on this week. It was on for roughly 150 miles, then went off. Happened twice within the past two weeks or so. Scanner displayed p0128 - Coolant Temp Below Thermostat Regulating Temp So...can I assume that my thermostat may be...
  10. Thermostat? how the crap do.........

    I4/I5 Engine & Drivetrain
    you get to it??? I stopped on the way home and bought one along with the proper amount of coolant (thanks Darek) thinking I would change it tonight because I think it is stuck in the closed position. The reason I think it is stuck in the closed position is the fact that it is not circlating and...
  11. Is there a 180* thermostat?

    Engines/Performance/Tech Questions
    I think the title says it all, but I can't seem to find one for the summer. THANKS:thumbup: