Hot answers tagged heater
Could also be failure on heater switch mechanics. It depends on hot/cool selector type but if it is mechanical then select should never feel loose when turning from cool to hot or the other way round. If selector is mechanical which means hot/cool valve is operated by some kind of rigid cable or steel rod and it is not uncommon for them to break at ...
A faulty, always open thermostat or a defective radiator temperature sensor would cause the symptoms you describe. When your cooling system sensors send implausible signals to the engine ECU, the ECU turns the fans on to run continuously soon after start-up. The thinking is that an engine running cooler is preferable to an engine being allowed to overheat.
First check would be that the engine has sufficient coolant. (NB Do not remove the radiator cap when hot). Second check is that the engine is reaching operating temperature - does the temp gauage rise and show hot?. If these items pass inspection, then the very probable fault is with the AirCon module. When you turn the AirCon on, the module shuts off the ...
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