Question about 2002 Chevrolet Blazer

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Need to know location of coolant temp sensor in 2003 Impala

I need to replace my coolant temp sensor but I do not know where it is or how to remove and replace it.

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  • sunshineluve Mar 04, 2009

    How much labor and dismantling does that require?

  • Anonymous Mar 15, 2014

    how hard is it to replace the coolant tem sensor on my 1998 tahoe

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Need more info. I see from the location of your post that you have a 2002 Blazer. Do you mean a Trail Blazer? Chevy didn't make a Blazer in 2002. The ECT (engine coolant temperature sensor) is located on the driver's side, front of the engine. (on top) It is between the ECM (engine control module aka the engine computer) and the alternator. You will most likely need to remove the alternator and it's belt to obtain easy access to the sensor. If you need to remove the alternator for access, remember to disconnect the battery's negative terminal first. The sensor has a wiring harness with a connector mounted to the top of it. After you remove the electrical connector, the sensor will screw out using a deep socket and ratchet. You will loose some coolant (antifreeze) during the change, so make sure you have some DexCool antifreeze on hand.
Charlie

Posted on Mar 04, 2009

  • Charlie Mar 04, 2009

    My mistake, there is a 2002 Blazer (the little one). It's ECT (coolant sensor) is located on the driver's side cylinder head, between cylinders #5 (middle) and #7 (rear) just above the exhaust manifold. Remove the air cleaner top and all related hoses from the engine for access. Disconnect the wiring from the sensor. Unscrew the sensor using a deep socket/ratchet. You will also loose some coolant on the 4.3 Liter engine in this truck. With either vehicle coat the threads of the new sensor with pipe dope. Permatex Liquid Sealant with Teflon is an excellent product for this purpose. It's available at any auto parts store.
    Charlie


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Usually found either on thermostat housing or close by on the lintake manifold. Usually can be removed with a regular wrench.

Posted on Mar 04, 2009

  • Richard Scordino Mar 04, 2009

    Depending on it's exact location and how much "junk" is in the way, generally should not take more than a half hour. If you are really bad at this, maybe an hour. To identify the sensor it sometimes helps to buy one and look and see what it looks like. You will be replacing the thing that looks just like the one in the box.

  • Richard Scordino Mar 04, 2009

    make sure there is no pressure in the cooling system when you take it apart or hot antifreese will go everywhere!!

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