Question about 1999 BMW 328 Series

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Auxillary fan will not shut off, continues to run when the car is not on. I have to unplug the switch before it will stop.

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Is this the radiator fan you're talking about? If so it's supposed to run after the engine is switched off unitl it cools down. More noticeable on hot days.

Posted on Jun 30, 2009

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I have new blower motor. it dosen't stop running


Could be a bad blower motor resistor,mounted by the blower.

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Car will shut off wont drive but engine keeps running then battery will go dead


It sounds as if your Ignition switch is damaged, or, you have a bad relay that is sticking. To check the Ign. Switch, remove the covers on the steering column to gain access to the switch, unplug it and the engine should stop, when it's running. If it's just cranking, it should stop when you unplug the switch. If it does, then the switch is the problem. The relays you'll have to troubleshoot individually with a test light.

If only the starter continues to crank after shutting down, then you need to test the solenoid on the starter as well as the starter relays and the Ign. switch to determine which is causing the current to continue to the starter.

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My fan keeps running even when car is off


The fan speed switch needs to be replaced. The switch is running off of the battery due to the fact circuit is opened

May 28, 2014 | 2005 Buick LaCrosse

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Why does my radiator fan on my grand prix stay on even when car is shut off? I have to disconnect for it to stop running


Sometimes these fans are made to run after the engine is shut off to dissipate residual heat. Will it shut off after 5 minutes on its own? If it continues to run after several minutes, then you need a new thermal switch in the radiator.

Feb 16, 2014 | Cars & Trucks

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Cooling fan runs continuously, even after shutting the ignition off


sounds like it could be a relay.

With everything plugged in and the fans running with the key off remove the cooling fan 1 fuse. Do they stop?

If they do not stop remove the cooling fan 2 fuse. Do they stop?

Aug 15, 2012 | 2002 Pontiac Montana

1 Answer

Location of the Auxiliary fan switch


The auxillary fan is used for AC cooling purposes, and your vehicle under normal circumstances should not overheat regardless of the status of the auxillary fan.

That being said, the auxillary fan is controlled by the PCM based on AC switch position via a fan control relay in your fuse box under the hood. There is no fan switch for it, as it is turned on based on PCM observance of AC control switch position.



Some things to look at regarding your overheat condition:

When the vehicle begins overheating, what are the conditions of the radiator hoses? Are both firm, or only one and the other soft? Are both hot, or is one hot and the other only warm?

Both a failed waterpump and a failed shut thermostat will show a hot hose on one side and only a warm hose on the other side of the radiator.

A failed (stuck shut) thermostat will also result in one very firm hose (highly pressurized and nowhere to go with the thermostat shut) and one relatively soft hose.

You can take the radiator cap off (BEFORE it pressurizes) and watch the water level as the car runs. If the thermostat is opening and waterpump is pumping, you will see fluid flow once it gets to operating temperature.

Watch your engine fan and see if it is engaged or just spinning freely. When warm and the engine shut off, the fan clutch should be engaged making the fan more resistant to turn. If it spins freely, the clutch is failing.

Check the area around the radiator and between it and the condenser for obstructions to airflow.

Obviously check the condition of the coolant for heavy scale/sludge. The 3.0/3.5 engines are notorious for turning coolant into thick rusty puddy.

Hope this helps!

Sep 11, 2009 | 2001 Mitsubishi Montero

1 Answer

Auxillary radiator fan will not shut off


the fan is controlled by the A/C as well as engine,so it could be a switch on the A/C its in the pipe somewhere and when the pressure builds up it turns the fan on ....or a sensor on the cylinder head thats packed up or just a rely arced across and melted contacts together.

Dec 05, 2008 | 1993 Mazda MX-3

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Electric fans runs after car is shut off, drains battery


Having the fan run on for a bit after the engine has stopped is not abnormal in itself, but 20 minutes sounds excessive.

If the fan does eventually shut off, I'd consider changing the thermoswitch (this is a sensor screwed into the radiator somewhere near the bottom, with a pair of wires connected to it - to change it, you'll need to drain the cooling system).

If the fan stays on continuously until the battery is completely flat, see what happens when you unplug the wires from the thermoswitch. If this stops the fan, you need to replace the thermoswitch. If it doesn't, then you need to examine the wiring associated with the switch and the fan, looking for damaged insulation.

A.

Nov 28, 2008 | 1999 Volkswagen Passat

1 Answer

1999 BMW 328i


As far as I know, this is normal. When I get out of mine, I hear the fan run for about a minute after I shut the car off.

Jul 23, 2008 | 1999 BMW 328 Series

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