Q: Q: Heat and air

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The heat and AC both do not work. The blower works but no changes for either. Ac is as hot as it is outside and heat is as cold as it is outside. No matter what settings I try it doesn't change anything. Any ideas as what the problem could be? It's starting to get cold and with 3 kids this is kinda important. Another thing what would cause the thermostat gauge on the dash to not work? It never moves up or down just sits at like a 1/4th rather car is on or off. Could this be what is wrong with the heat? Could there just not be a thermostat in it?

My car has 166000 miles.
My car has an automatic transmission.

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