Depends on the car, anywhere from fifty bucks to a couple hundred.
I paid $89 for a thermostat and $98 for labor
How much does it cost to fix the thermostat housing for a ford explorer sport 4.0 6 cylinder
Cheap-it's a 5.00 part you can replace yourself.
how to replace thermostat on a 1964 Thunderbird
how do you replace thermostat for 2004 cavalier
About $12.00
$150
remove old thermostat and replace with new thermostat and gasket
Replace your thermostat whenever you replace the coolant and service the cooling system. Also replace it if you suspect it is sticking.
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Replace thermostat on 2000 vw jetta
How do I replace the thermostat in a 2004 1.8T jetta?