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Replacing a thermostat on the 4.2 - 2004 GMC Envoy

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The thermostat is located in a water neck on the driver's side of the engine below, and slightly behind the alternator. put a big drain pan under the vehicle. The thermostats I've seen are integral with housing.
Will set a P0128 code I believe when t-stat is defective, and will need to be cleared, if that is set in ECM. Make sure to run engine afterwards and keep filling coolant until all air is removed from system and thermostat opens. Hose will feel hot.

Posted on Jan 24, 2013

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Posted on Jan 02, 2017

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Fig. Thermostat mounting-2.2L engine

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THERMOSTAT REPLACEMENT (4.2L ENGINE)
Removal Procedure
1. Remove the necessary coolant from the radiator.
2. Remove the generator.
3. Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
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