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Harold Shandera Posted on Jun 25, 2015
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When the vehicle gets warm the air conditioner kicks off when idling and the engine starts to heat up because I think the fans shut off but when you take off the air works again

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Huseyin Huseyin

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  • Lexus Master 3,469 Answers
  • Posted on Jun 25, 2015
Huseyin Huseyin
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Joined: May 25, 2015
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Are you sure you have the air conditioning on and not the fan?? sounds very much like it. The airconditioning compressor is discrete, separate from the engine/heater.
Is your coolant reservour fully charged with coolant?
Think you may need to check these

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Fan doesn't run while in idle and begins to over heat until I start driving agin then it cools back down to normal. Also the fan runs when engine is off and drains the battery.

The fan is only supposed to come on when there is excess heat .. in normal driving conditions it doesn't start. When you start your car in the morning the fan won't come on because the engine is cold.

With a hot engine - and it depends how hot the engine is - the fan will only kick in to prevent overheating. In heavy slow moving traffic or a traffic jam, the fan will kick in if needed.

The air flow through the radiator is usually sufficient -in normal driving conditions - to cool the engine.

When you park up and the car has a hot engine, the fan will kick in. This is perfectly normal. It is caused by a surge of hot coolant triggering the fan sensor. Perfectly normal.

The fan then should cut out after a while .. maybe 2-3 minutes at the most. If the fan runs continuously that suggests a fault in the temperature sensor switch.

Next time - wait by the car and see how long it takes for the fan to quit after you have parked up. It should stop of its own accord after a couple of minutes.

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