Having problems with your 2005 Chevrolet Impala ?
Where is the thermostat on a 2005 impala 3.4 and how do I replace?
Your thermostat is located inside the thermostat housing at the end of the upper radiator hose, on the back of the engine. Just find your upper radiator hose and follow it to the engine. It's hooked to the thermostat housing. easy... now comes the fun... \012To replace your thermostat, you have to remove the air intake duct (which mean unplug all your sensors on it, MAF etc). That should give you better access to the housing. \012You still have the throttle body right above the housing, and you may have to remove it too for better access and that sucks...(it involves disconnecting some coolant bypass lines...make sure you drain your radiator before you do so) \012Once you have that done remove the thermostat housing (after you unplug the coolant temperature sensor) and have some towels and a bucket ready as coolant will be coming out of it. \012Remove the old thermostat, remove the old gasket if necessary, and put the new thermostat with the new gasket in there (with the spring pointing toward the engine). Put some RTV sealant on the housing bolt it back on there, and put the throttle body back as well as the air duct and all the sensors. Refill your radiator, turn your engine on and check for leaks.
Follow the upper hose to the metal pipe that is attached to the lower intake mainfold. The thermostat is behind that pipe. They are a PIA to replace. You need a 13mm socket, swivel, extensions, ratchet, and 13mm wrench. Sometimes it helps to remove the throttle body. Most of the time they are replaced along with the lower intake gaskets which fail quite often.
Repair Help & Product Troubleshooting for 2005 Chevrolet Impala
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