Hello. Accessing the thermostat does not require any work to be done to the dash. The thermostat is locate on the engine and will require removal of the radiator hose and the thermostat housing. The only part of the cooling system that is located in the dash is the heater core. If you want to have your thermostat replaced, consider YourMechanic, as a certified mechanic can come to you to [replace your thermostat] https://www.yourmechanic.com/services/thermostat-replacement
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