Question about 2002 Ford F150 Regular Cab

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Battery drain heater fan stays running with engine off..relay clicking under dash with engine off and key removed

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  • Steve S
    Steve S May 11, 2010

    Have you had quite a bit of rain / snow as of late. Might want to check the driver's side kick panel ( by the parking brake ) and the edge of the carpet where it ends on the firewall for signs of water damage. Could be a leaking windshield / moon roof and the GEM got wet, causing the issue. HVAC blower running after the key is turned off is one of the symptoms

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  • Ford Master
  • 6,826 Answers

Change that fan relay that is clicking,with a new relay.

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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My Jeep Cherokee Limited 2004 is draining the battery when off. The Car heater/ac fan runs constantly and the interior lights stay on. When I jumped the car, the engine died when not pumping the acc


only the HL and parking work , key off.
find what lamps glow, key off.??
there are lots of interiour lamps.
dome lamps
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with keys in pocket, and HL and park switch off.
best is to do this in the dark.

and thus the name Dark current. (or phantom drains.)

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98 Honda civic cx over heating when stopped in traffic - I went thru cooling system, replaced hoses, thermostat, fan, radiator cap. After that stated to overheat on freeway after about 40 miles. pulled...


Unplug the fan on sensor. It should have one green wire and one black wire. Use a paper clip and jump the two wires. Turn the key to the run position, the engine does not need to be running. Does the fan come on? If not check the green wire for 12 volts and the black wire for ground. If there is no ground than run a new ground wire. If the is no power check the heater/air conditioning fuse in the under dash fuse block. If there is power and ground make sure both the cooling fan fuses are good and both the cooling fan relays are good.

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1 Answer

1989 Cadillac sedan deville fans keep running when I take key out


This vehicle has four cooling fan control relays . without looking at the vehicle ,just off the top of my hear i would say a relay had stuck contacts inside . Do you know what a relay is an how there work ? The relays are energized by the BCM - body control module , do you know anything about automotive electronic's ? Do you know how to test automotive electrical systems ? Here is a web site for free wiring diagrams http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine . Under system click on engine ,then under subsystem cooling fans. click the search button then the blue link.You will see the coolant fan relay , med. speed , low speed , an high speed . Can you tell what speed the fans are running at ? find the appropriate relay an pull it out of the relay center .

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1 Answer

Blower moter will not shut off when I turn the key off.


More than likely it's the blower motor resistor. Gm's wonderful electrical engineers decided it was a good idea to run constant power to the high speed fan relay which is part of the resistor assembly. When the relay stick the fan stays on. The resistor is located under the dash on the passenger side ne'er the blower motor. There is a plastic trim pannel that will need to be removed from under the dash in order to see it. It is typically help in place with two screws that you will need a 5.5mm socket to remove (yes it's a 5.5mm socket). Lmk

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1 Answer

Our 94 Jeep Grand Cherokee's heater/air


My fan was stuck on low. I looked at the control module in the dash. Some of the contacts had over heated and melted part of the module. Our dealer said it was a $300 fix.

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My 2001 SLK-230 when I turn off the ignition key, the air circulation in the car continues to blow air until my battery dies.....


Sounds like there is a relay that is stuck, so the connects are still made and the fan keep going even though the car is off. Look for the fan/HVAC relay. I do not have this vehical but there is a juction box or relay box under the dash of in the engine compartment. Remove/replace the relay.
If your car has a water leak moisture can cause the problem.

Jun 13, 2010 | 2001 Mercedes-Benz CLK-Class

1 Answer

04 chrysler pacifica dashboard lights stay on & drains my battery


my dash lights stay on after i turn off my van, the fan stays on also the alarm does not work or the keyless entry does not work.

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3 Answers

Why does the heater blower stay on when the car is turned off and the keys removed its a bmw


are you talking about the fan blower inside the car or the fans under the bonnet..? the fans under the bonnet may stay on for a while after the engine is switched off to prevent heatsoak. This is when the engine actually heats up more after switch off due to latent heat within the engine. The fans will remain on until the coolant temperature has fallen and stabilised, then the fans will stop. If the blower fan inside the car keeps running, this may be a feature on the car to assist with heat soak but I would think this is more like a faulty power relay or fan controller if the car has climate control..In this case, my advice would be to consult a qualified autoelectrician.

Oct 31, 2009 | 2000 BMW 3 Series

1 Answer

Relay/resistor heater blower


There are two fuses for the fan. One is probably a 20 Amp in the fuse panel in the cab and marked "Heater". or "Heater/AC" The second is under the hood may be marked Heater, Blower, or Fan and should be 30 Amp. The one in the cab supplies switched 12 volts to the fan speed switch. The one under the hood supplies the 12 volts to the relay. The relay is normally energized by the 12 volts through the 20 Amp fuse in the cab and through the switch. I think you find that the fan has the normal speeds except for missing HI with the underhood fuse removed, and will turn off with the ignition that way. There is no hazard in operating it that way but you may want to replace the resistor/relay assembly before it gets too cold. The relay is a pretty trouble free device in most cases, maybe you can find a deal on a good one at a junkyard.

The whole idea with the relay under the hood started back in the Sixties believe it or not. There is considerable voltage drop in the wiring between the fan switch and the blower fan motor. By adding the relay under the hood right next to the motor, the voltage drop was reduced, both by the shorter wire, and by using heavier wire to boot. The motor gets really close to the full system voltage when the relay is closed. In your case where the relay keeps the fan running, it can drain a battery rather quickly too!

Dec 18, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

4 Answers

COOLING FAN STAYS ON AFTER CAR IS TURNED OFF AND DRAINS BATTERY


Hi,
I think there may be a control unit for the fan near one of the front suspension mounts, but it may be a "stuck" relay in the main relay board. Unfortunately I don't know which one it is, but you could remove and replace them one by one until it stops!

If it is one of the removable relays you could try giving it a "reminder" by tapping it on a hard surface and hope that it frees itself.
Hope this helps you a bit. D.

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