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- Does air get hotter towards the passenger side vents?
- If you turn the car on with no engine and the fan at low speed, can you hear the temperature door swing in the vents if you cange the temperature from one extreme to the other?
- If it's already hot, touch the heater hoses, are they hot or cold? On hot/one cold? Both hot? both cold?
- Wait until it's cool. Open the radiator cap. Coolant level? - IF low, check for leaks.
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