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  1. #1

    Default P0128 code always low temp

    2005 Trailblaxer 4.2 engine. Is the thermostat located where the top radioator hose connects to the block or is it located where the bottom hose comes from the water pump? I think the thermostat is the problem but I guess it could be the sensor as well. The temperature gauge fluctuates dropping to 180 degrees, seems like the thermostat might be sticking. Anyone have any experience with this problem?

  2. #2

    Default

    it's the therm. up on top left side of head
    2000 sierra 1500 5.3
    k&n cai
    hypertech programmer
    flowmaster catback
    7" lift 456' s. 35/12.5 nitto teragrapplers
    roll bar. Baha spare tire holder
    brush guard custom tail lights
    full sound system dvd nav

  3. #3

    Default

    Quote Originally Posted by ghotachevy View Post
    it's the therm. up on top left side of head
    sorry but your wrong. i just did muine and its located under the alternator as well as the sensor.

  4. #4

    Default

    X2, did my wifes '05 and its located under the alternater. Wifes truck was throwing the same code and it was a stuck open t/stat.

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