Thermostat housing, and it is a housing, is about $35. The labor is about 1.5 hours as you must remove the alternator to get to the one bolt on the housing. If you have big arms the battery removal will help you get in there easier.
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I had mine replaced and the cost of the thermostat and housing was $48.67 without the cost of labor.
At 100,000 miles or 160,000 kilometres you change the spark plugs. www.trailvoy.com All the answers for your Envoy/Trailblazer from true enthusiasts!
This answer will vary with what's wrong and which shop looks at it.
It cost me about $100.00 for the part and about an 1-1/2 of my time.
A good quality one will cost $10.00 to $15.00.
I went to a muffler shop and was charged $225 for parts and labor
The thermostat on a 6 liter 2003 Chevy express is located on the left side of the water pump. The thermostat is a one piece unit attached to the thermostat housing, which is then mounted to the upper left side of the water pump. The average cost for this one piece thermostat/housing is around $25.00.
thermostat is located behind the alternator on the drivers side bottom hose 2 bolts and the thermostat and aluminum is one peace cost is around $50.00 at NAPA
If you are looking for a programmable thermostat for your home, try Askarepairtech.com. They have good pricing.
I would expect $100-150.
I would suggest changing this every year or 10,000 miles but that it probably a little more frequent than what it really needs. It is very easy to change this, takes less than 15 minutes, and doesn't cost very much so that's why I do it every year.