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 do you replace thermostat for 2004 cavalier
how to replace thermostat on a 1964 Thunderbird
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.
follow the top radiator hose to locate the thermostat housing, remove the hose from the housing then unbolt the housing. remove and replace the thermostat and rebolt the housing to the motor, replace the hose The housing is made of cheap metal and should be replaced. It is important to "seat" the thermostat properly. Also, it is much easier to replace and remove the thermostat housing if you first remove the timing belt housing.
Thermostat ($10-50) + one hour labor (depends on shop). In some case you might have to replace coolant + 1-2 gallons.
how to replace a thermostat on a bronco 198511