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Re: The fan motor work all the time when start the engine
Maybe temperature sensor is giving false reading. Thry replace it it's not expensive and it will not make erors on vag com because it is working, but just not properly.
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Disconnect the ECT (engine coolant temperature) sensor with the key on, the fan should start in default and stay running, if it doesn't run check for voltage at the fan motor connector, if voltage is present and the connector is not burned looking or discolored replace the fan motor. If the fan has no power try jumping the relay socket to power up the fan motor circuit, if that works replace the fan motor relay under the hood. You gave no make, model or year and engine type so that is about all I can help.
First check the fuse in the fuse box .
It also depends on witch fan /engine cooling fan /Blower motor fan.
Engine fans will have a relay more so then a blower motor .
The differences is this the blower draws more power and runs on a different ckt then the engine controls .So you can use the blower motor with out the engine running key on .
You don't say witch one you are having the problem with so I will try to explain both .
Most of the time both have relays and fuse's .The heater fan works on HI only off the relay so the relay is good if it works on HI.
The relay for the fan to cool the engine is different it controls all speeds do to temp change its cold some times has to handle more information .The relay the one thing they both have in common is the connections tend to get corroided Most of the time you can unplug and clean the plug in connectors to fix the issue
HVAC post?
the Heater fan motor is dead on high?
the Cluster gauges and warning lamps are all dead?
what is dead, and what is not?
power loss, engine power,
do check all fuses first. in both boxes
if fix the fan first. he heater fan nust work on high.
if not fix that. its very simple and if you fix that,there is a good chance
other things start working
the #1 thing to fix first is headlights or parking lamps dead .
as these all work keys in pocket. and is an easy fix.
Start the engine with hood up. Wait for it to reach operating temperature. When it does, fan should cycle on for a few seconds, then off. If it doesn't come on, turn car off and make sure fan is free spinning-no obstructions. Be careful, if engine is warm, fan can come on and start running. If fan is free wheeling, jumper it from battery to fan connector to check fan motor. If motor works when given battery voltage but still won't come on as it should (usually the engine has to be quite warm to turn on the fan-as in stop and go traffic, or long idle times), you will have to check wiring at the fan relay, check if temperature switch to turn fan on is working properly, check if computer is signaling fan to turn on at the relay. You will probably need a wiring diagram if you don't find the problem as a bad fan motor or bad relay.
the cooling fans on your car are comanded on by the engine control module which reads engine temperature from the temperature sensor . when comanded on the engine control module sends a signal to the cooling fan relays . which in turn runs the current to the cooling fans . So you might want to check the cooling fan relays and make sure the fues for the cooling fans are good and the relays .if the cooling fan fuses and relays are good it could be a problem with the fan motors or the engine control module not reading the right temperature in that case it could mean you have a problem with the temperature sensor
Check voltage at fan motor, sounds like fan motor has had it, that's why it was spinning slow, kinds like a starter, won't work as fast when starting to go out or not work at all, if you have voltage, replace it.
The power connection to the fan motor on these is known to overheat and cause a bad connection.The fan motor is above the passengers feet.Next time the fan motor will not come on, switch the selector to high and wack the bottom of the dash above the passengers feet.If the motor does come on at that time,you may need a replacement fan motor and connector.REPLACE the fan speed resistor board when replacing the fan motor,which is right behind the fan motor.
Hi there. It sounds like your cooling fan and/or electrics associated with it might not be working correctly. Perhaps the reason for the engine light coming on is that your engine temperature is too high as a direct result of the cooling fan not working properly. If after starting the engine you don’t see, or hear the radiator cooling fan working, this is the most likely cause of the engine overheating. You then need to have either a Dealer or ServiceCenter identify why the cooling fan is not working – wiring/connections, fuse, sensor or fan motor. Hope this helps, Scottech.
its not normal.its a coolant temp sensor which has malfunctioned causing the ecu to think the engine is hot even when its not.hence the fan on for so long after ignition switched off.the sensor needs to be changed and put on a diagnostic machine afterwards.just bring it to a garage.
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