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Batt. run down. Found both fans on 1999 buick lesabre running 4 ohours after engine turned off. Susfect relay but found 4 relays in relay compartment but no label
Re: int. fans keep running hours after eng. shutoff
The problem is not caused by the realy, it is caused by the fan speed control module, it is located near the fan motor on the passenger side under the dadsh behind the glove box, replace it.
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How long does it run? The reason I ask is because it is designed to run after engine shut down under certain conditions of temperature to cool down the engine and prevent vapor lock in the fuel rail. If it just stays running all the time after the key is turned off that is of course a problem.
if you are talking about the engine electric cooling fan..it will run after car is turned off until temp goes down then it shut off..unless you're talking about the heater blower motor..then i would look in the engine compartment passenger side firewall for the heater box ..on the box there is speed control resistor for the heater fan speed..that might be shorted.if not fan switch on dash..give more info next time..it makes it easier answer with more info
sounds like a battery ground,check chassis ground strap coming from - batt terminal to the body. Also the one bellhousing bolt in front of engine down by the starter has ground for sensors.
Check there ,make sure it's tight.
Do you have check engine light on???if so scan it OBD 2 yue$$ding isn't the way to go,if you don't have a check engine light on then perhaps coil pack!!! coils do run intermittent some times! and not trip the eng light on !!!!this would be a great place to start.Hope this helps
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