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Well, I don't mean to sound snarky, but when it doesn't work anymore! The thermostat, in its most basic form, is just a switch to turn the heater on. If the heater turns on and off like it should, it is OK. If the heater doesn't turn on, or worse yet doesn't turn off, you should look into getting a new one. Some tests you can perform: Heater doesn't turn on? Get at the wires running to the thermostat and touch the two control wires (You will have to look into the furnace documentation if you have more than two wires) together. If the furnace clicks on, it's the thermostat. If it doesn't, it's the furnace. Heater doesn't turn off? When the furnace is running disconnect one of the control wires. If the furnace shuts off it's the thermostat. If it doesn't, it's the furnace.
What else can I help you with?
Where is the thermostat located and how do you replace it on a 1999 Plymouth Voyager?
Need to know which engine you have.
Do you need to remove anything to replace the thermostat?
no
Do you need to replace a water pump and thermostat at the same time?
You do not need to replace a water pump and thermostat at the same time. These parts do not ruin each other.
You have a 95 Chrysler cirrus lxi need to replace the thermostat need to know where it is?
It is within the water outlet which is at the bottom of the top radiator hose. Mark
How do you replace the thermostat on a 2001 Honda Passport?
WE DON'T KNOW!
What is wrong with a 1985 Nissan 300zx turbo if it only blows cold air the heat is on and apparently not working?
Two problems that I can think of are you need to add some antifreeze or you need to replace the thermostat. Two problems that I can think of are you need to add some antifreeze or you need to replace the thermostat. Two problems that I can think of are you need to add some antifreeze or you need to replace the thermostat.
How do you replace a temperature sensor on a 2003 Saturn Vue?
If you do not know how to replace it, then you should not try to replace it. If you want to know WHERE it is, then look near the thermostat housing.
Were is the thermostat?
NEED to know what you are working on.
Do you need to replace thermostat when you change the radiator?
I woul highly recomend it but you dont need to
Why leak on thermostat housing 2001 dodge intrepid?
There's a gasket between the thermostat and the block that you need to replace.
Do you need to replace the thermostat when replacing the water pump on a dodge truck?
No
Where is the thermostat and how do you replace on a 1999 Mazda 626?
I don't know about the 4 Cylinder, but the 2.5L V6 1999 626 has the thermostat on the lower hose area, where it attaches to the engine/thermostat housing. To replace it, I had to take the entire air box out. It took a bit of work. You also need to take off the heat pipe mount attached to the engine in order to pull the thermostat housing apart.Not the easiest job for a thermostat replacement.
