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The heater blows out only cold air at operating temperature. Technician A says a stuck closed thermostat could be the cause. Technician B says the cooling system could be low on coolant. Who is right?

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ASE defines area A7 heating and air conditioning as an individual service area. This area includes all components and systems both mechanical and electronic that are related to a vehicle's heating and air conditioning system.


The heater blows out only cold air at operating temperature. Technician A says a stuck closed thermostat could be the cause. Technician B says the cooling system could be low on coolant. Who is right?





 
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