Question about 2001 Chevrolet Impala
To install a thermostat, locate the drain on the radiator, this drain is at the bottom of the radiator, unscrew it and allow coolant to drain , make sure to remove the radiator cap first, let it drain enough to lower it so you dont make to much of a mess when hose is removed, let it drain about 5min, that should be enough, next is to remove the upper radiator hose, only remove the hose at engine and push it out of the way. the housing that it come off will be the thermostat housing, you will see two bolts that hold it in place, remove the bolts and pull housing off, a little coolant may drain out so keep a drain pan under the car in that area. With housing off you will see the thermostat, pull it out, note the way it comes out as you will need to install the new one the same way, noet that the spring part of the thermostant goes into engine. okay with thermostat out you will clean the mating surface, it uses a rubber oring around the thermostat so this should be easy to clean as there is no gasket material stuck to housing or engine, install gasket on new thermostat,some thermostat come with the gasket already on, if not install new gasket, put into engine , install housing and tighten bolts evenly, install hose and fill cooling system. hope this helps.
Posted on Apr 02, 2011
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Posted on Jan 02, 2017
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Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat .
Specific instructions for your car are as follows. Let me know if you get stuck or have more questions. 5.3L Engine
Removal & Installation
NOTE The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
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