Question about 2005 Chevrolet Impala

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Heater fan motors

Fan motor continues to run with engine off and drains battery.

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  • Chevrolet Master
  • 1,038 Answers

The most common issue is the fan relay is NG or a bad AC/ heater switch (if we are talking about the AC/heater fan.

Posted on Jun 28, 2014

6 Suggested Answers

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: blower heater fan only works on 4, 1,2,3,and 5 don't work

check fan blower relay

Posted on Aug 29, 2009

SOURCE: heater fan not working in 05 Chevy Equinox

I suspect you also checked the fuses, some vehicles are double protected, especially since you usually have to remove the entire dash panel to get to the heater fan blower motor. It should be in the middle or under the glove box, should be located in a plastic box that has like a bell shape to where the motor is. check fuses then check wiring, and make absolutely certain the relay was the correct one that you changed, in a 3 year old vehicle the fan motor should not be bad yet.

Posted on Jan 09, 2009

emissionwiz
  • 75051 Answers

SOURCE: Low air flow from AC/Heater fan on '98 Chev K2500

check the cabin air filter behind the glove box, if it is ok or is not equipped (was optional) then the problem is a clogged ac evaporator core.

Posted on Jun 23, 2009

alicantecoli
  • 22095 Answers

SOURCE: My heater blower fan motor will not work.I have

hyave you checked for a feed to the motor

Posted on Dec 11, 2009

arauzvictor1
  • 466 Answers

SOURCE: 2004 chevy express van heater has no high

Ok the problem is with the resistor assembly blowermotor right rear of engine compat.Thanks

Posted on Jan 30, 2010

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1 Answer

What causes fan to continue running when engine is off and the battery is drained


it could be a faulty fan relay, however some of these had a continue run time program that allowed the motor to cool off after engine shut down. it shouldn`t run longer than about 2/3 minutes.

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Hi,

If you're referring to the heater "FAN" running continuously, then its likely to be your blower motor resistor.

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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

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