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How do you find out what part of your cooling system is bad 99 A4 V6 QT The warning light came on coolant levels are good belt and fan are good?

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2006-08-16 20:00:00
2006-08-16 20:00:00

check or change: hoses for blockage, thermostat operation or blocked radiator..

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What are you asking; what the function of the warning system(s) are or what could be causing it/them to turn on? In general: Most cooling systems only have warning systems for excessive temperatures, i.e temeprature gauge and/or warning lights. Some may have a warning system for low coolant levels in the expansion (header) tank also. In rare cases, there are systems for cooling system pressure and glycol dilution levels. If any one of these systems are active, it indicates either a fault in the cooling system or prehaps in the sender unit and/or warning system itself, i.e. high temp warnings upon a cold start. Signs of cooling systems problems are a regular loss of coolant, high engine operating temps, ineffective cooling fans, pregnant hoses, a hot smelling motor when running, peeling paint on the rad itself etc If you are a little more specific prehaps I can help more. Thanks, CHarlie

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You are low on coolant or the low coolant sensor/wiring/connection is bad.

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You may need to add fluid to your cooling system. These lights are programed to alert you if the levels are low.

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Low coolant? Cooling system airbound? Low coolant? Cooling system airbound?

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Low coolant? Cooling fan not working? Bad thermostat? Cooling system airbound? Water pump not circulating coolant? Radiator core plugged or restricted? Bad radiator cap?

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to check for leaks or in the case of the cooling system preasure cap to raise the boiling point of the coolant

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Poor coolant circulation in the cooling system.

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The coolant will not protect the cooling system against corrosion.

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You probably need to replace the heater core. Be sure to also check your coolant levels, as well as the condition of the coolant - if it's burned out, have the cooling system flushed and the coolant replaced.

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Coolant system warning light. It should go off when you add coolant.

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Air can get into the cooling system when the coolant is replaced as either part of a maintenance schedule or when the system must be drained for a repair. When the coolant is replaced the coolant system must be "burped" to get any air out of the coolant lines. There are various ways to do this dependant upon the type of vehicle. A repair manual for your vehicle will describe the proper technique.

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The cooling system is a closed system. If there is smoke (probably steam) there must be a leak in the cooling system somewhere.

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Sounds like you may have a bad head gasket.It will leak exhaust into the cooling system and create alot of pressure

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It raises the boiling point of the coolant

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You cooling system requires coolant in order to keep working properly, if you are wondering why your room is still hot even though you have the AC on; it is because your air conditioner is out of coolant. Just call your local heating and cooling specialist.

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Actually, it always is when operational. The pressure is what moves the refrigerant or coolant (depending on whether you're referring to the air conditioning or the engine cooling system) through the system.The pressure raises the boiling point of the coolant.

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Nothing will happen if you drain the cooling system and replace the coolant.

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I would have the cooling system flushed and coolant replaced. DEF is very caustic.

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Air bound means that there is an "air bubble" in the cooling system that is preventing coolant from circulating in the cooling/heating system. (air can be compressed fluid cannot)

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The radiator cap controls cooling system pressure.The radiator cap controls cooling system pressure.

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low coolant? Plugged or restricted radiator? Water pump not circulating coolant? Cooling fan not working? Thermostat not opening? Cooling system air bound?

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Bad temperature sensor unit? Cooling fan not working? Water pump not circulating coolant? Radiator plugged or restricted? System airbound? Thermostat not opening?

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Lack of coolant, lack of coolant flow, air in cooling system, lack of airflow over radiator,........

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If you do not visibly see a coolant leak, have the cooling system pressure tested. If the leak is not obvious it could be internal.


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