How do I change the thermostat on my 2003 6cyl chevy trailblazer?

Remove the necessary coolant from the radiator.

鈥emove the alternator.

鈥oosen the outlet hose clamp at the thermostat housing (1). Remove the outlet hose from the thermostat housing.

鈥emove the thermostat housing bolts.

鈥emove the thermostat housing from the engine block.

鈥lean all of the surfaces of the thermostat housing.

鈥lean the sealing surface of the engine block.



Installation Procedure

鈥nstall the thermostat housing to the engine block.

鈥nstall the thermostat housing bolts.

Tighten the bolts to 10 N路m (89 lb in).

鈥ubricate the inner diameter of the radiator hose with engine coolant.

鈥nstall the outlet hose to the thermostat housing (1). Secure the hose with the clamp.

鈥nstall the alternator

鈥ill the cooling system with specified coolant and concentration.

鈥nspect all sealing surfaces for leaks after starting the engine.
How do I change the thermostat on my 2003 6cyl chevy trailblazer?
basic

remove top radiator hose at top of motor

remove two bolts in housing lift off remove thermostat

take note of how its faces

scrape of old gasket top of motor and housing

replace new gasket and new thermostat



type into search box



how to replace car thermostat video



wil do same pretty much same with every car made
How do I change the thermostat on my 2003 6cyl chevy trailblazer?
Pretty easy. First answer explained it. Make sure you put the hoses on securely. Even if you can't pull it off, hydraulic pressure created by the heat and coolant can. So make sure the clamps you have go back in the same position and are tightened securely. Otherwise you'll have a bad day. And before brilliantly refilling your coolant, make sure you put your petcock back on otherwise it will come right out the radiator and waste your expensive dex cool coolant.