Trying to replace the thermostat on a...

Trying to replace the thermostat on a 2003 chevrolet cavalier

Posted in the Chevrolet Cavalier Forum

Anthony

Quispamsis, Canada

#1 May 10, 2010
I'm unable to find the thermostat housing to replace the thermostat on my 2003 chevrolet cavalier. I've already purchased a auto repair manual hoping there would be a picture showing where it would be located on the engine. Unfortunately the repair book I purchased isn't very imformative at all!
I believe the thermostat housing is located beneath the exhaust manifold. If anyone can confirm this for me or point me in the right direction of exactly where it is, that would be terrific!
Chad

Des Moines, IA

#2 May 23, 2010
you are not going to like my answer, I too have a 2003 Cavalier and I need to change the thermostat on it as well. From what i can find out, the thermostat is located in the water pump housing and is a real pain in the well you get the idea, to change. Therefore I am gonna wait for a while before i change it and swap out water pump at the same time
AJM

Houston, TX

#3 Oct 14, 2010
If you trace the top radiator hose it will connect to the thermostat housing, which is located underneath the exhaust manifold.
bert

United States

#4 Dec 19, 2010
It is behind the water pump on all cavalier
sambaman - Abbotsford BC

Kelowna, Canada

#5 Dec 4, 2011
The thermostat is inside the aluminum housing mounted on the rear of the engine block on the driver's side. The cover is held in place by two 10mm bolts. A cross-over pipe comes out of the cover and goes under the exhaust to the water pump, which is mounted on the passenger side. The top bolt of the thermostat housing is hard to get at. Removing the exhaust heat shield helps. Drain the rad before beginning. The drain plug faces frontwards(same as headlights) and is on the driver's side in the lower corner. Twist then pull it right out. There's also a drain plug on the bottom of the water pump - 13mm. You will need to get a new o-ring for the cover and two smaller o-rings for the crossover pipe besides the new thermostat, which will also have a rubber ring around it. When you put it back together, be sure to put the thermostat in first, spring facing towards the passenger side, then put in the black plastic sleeve. Be sure to line up the little notch on the sleeve with the notch in the housing before you put the cover on. Give yourself the day to do it.Good luck.
Frank

Raeford, NC

#6 Dec 12, 2011
sambaman - Abbotsford BC wrote:
The thermostat is inside the aluminum housing mounted on the rear of the engine block on the driver's side. The cover is held in place by two 10mm bolts. A cross-over pipe comes out of the cover and goes under the exhaust to the water pump, which is mounted on the passenger side. The top bolt of the thermostat housing is hard to get at. Removing the exhaust heat shield helps. Drain the rad before beginning. The drain plug faces frontwards(same as headlights) and is on the driver's side in the lower corner. Twist then pull it right out. There's also a drain plug on the bottom of the water pump - 13mm. You will need to get a new o-ring for the cover and two smaller o-rings for the crossover pipe besides the new thermostat, which will also have a rubber ring around it. When you put it back together, be sure to put the thermostat in first, spring facing towards the passenger side, then put in the black plastic sleeve. Be sure to line up the little notch on the sleeve with the notch in the housing before you put the cover on. Give yourself the day to do it.Good luck.
So you say the thermostat goes into the housing first then the black plastic sleeve on top and then the thermostat housing?
Scott

United States

#8 Feb 15, 2014
Anyone know a way to bleed the air out? Can't find a bleeder screw.

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