Edmunds Answers

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  • avatar karjunkie 01/02/09 7:36 am PST

    First, start with some simple checks. Check the coolant level in the radiator, not just the overflow tank. Do this when the engine is cold as you don’t want to take the radiator cap off when the engine is hot. The cooling system is designed to reduce coolant flow to the heater core when coolant is low. If it has been more than 30K miles since you did it the last time, do a chemical flush of the radiator to clean the heater core of sludge and scaling. The heat and air conditioning ducts are controlled by vacuum motors. Check the vacuum supply hoses from the engine to the heater/air-conditioning controls for cracks or leaks at the connections. If your car is equipped with a heater control valve, make sure that it is operating properly. Good luck and let us know if you have any follow up questions!

Answers

  • karjunkie 01/02/09 7:36 am PST

    First, start with some simple checks. Check the coolant level in the radiator, not just the overflow tank. Do this when the engine is cold as you don’t want to take the radiator cap off when the engine is hot. The cooling system is designed to reduce coolant flow to the heater core when coolant is low. If it has been more than 30K miles since you did it the last time, do a chemical flush of the radiator to clean the heater core of sludge and scaling. The heat and air conditioning ducts are controlled by vacuum motors. Check the vacuum supply hoses from the engine to the heater/air-conditioning controls for cracks or leaks at the connections. If your car is equipped with a heater control valve, make sure that it is operating properly. Good luck and let us know if you have any follow up questions!

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