Question about 2003 Chevrolet Silverado 1500

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Where is heater blower relay switch on 94 chevy silverado

Heater blower makes tapping sound after starting and shutting engine off.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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keemo68
  • 1263 Answers

SOURCE: 2004 Chevrolet Silverado Heater/AC Blower on without Ignition ON

there is no relay for the heater fan it's a 15 amp fuse and is on the accessories circuit. the reostat is responsible for all 3 speeds .with the key off there should be no voltage to the blower motor whether the fans speed fan switch is on or off. the fuse will be located in the fuse paneleither on the drivers left side in the dash or underneath the dash in the fuse block. you have a short in the harness that is under the dash and most likely it's a bad plug on the harness. your going to have to do some searching but that's where the problem short is... please rate

Posted on Oct 04, 2008

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  • 328 Answers

SOURCE: 2004 Chevy Silverado Heater Switch

It could be the switch or your blower motor resistor.

Posted on Jan 16, 2009

MacGyver911
  • 42 Answers

SOURCE: 2003 Chevy Malibou RU872 resistor location blower switch relay

For location and replacement of the BMR. Remove the shroud below the glove box, 2 screws and a snap-pop fitting. Be careful of the courtesy light. Remove the blower moter and disconnect the power harness - - you'll need this extra room to work with. 2 more screws, same size, 7/32, 6.5, 7or 8mm on some, that holds the blower motor resistor in place. This replacement part is less than 40 bones at most parts store. Unplug, replace, re-install, test and you're on your way with about 2 hours of slow paced effort in your own driveway. Typical cost at a garage/dealer - up to $400.

Posted on Mar 19, 2009

  • 41 Answers

SOURCE: Tapping noise near computer 1994 Chevy 1500 Silverado

air recir actuator motor shorted you can reach between blower motor and heater case and unplug a pain to replace

Posted on Nov 29, 2009

  • 46 Answers

SOURCE: heater and air conditioner blower switch.

Check the resistor first. It may be bad. Should be under pass. side of the dash close to blower motor mounted in bottom of evap case. Remove it and try known good one first before going at the switch. If it works on high then the switch may be okay. Good luck.

Posted on Jun 06, 2010

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1 Answer

My 2006 Chevy Silverado 1500 extended cab heater won't shut off when I turn heater off and when truck isn't started and still stays on


Sounds like the HIGH fan relay is stuck in the ON position. Pull the relay and see if it goes off. It should. Then simply replace the relay. This relay should be located under the hood, in the black relay/fuse center.

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Trying to find the relay switch to my heater on my 1994 Chevy 2500 Silverado?


There might not be any relay, Mary - it might be wired directly from the switch to the blower motor, although the lower blower speeds may go through a speed-reducing resistor pack to get there. If that's true, the resistor pack will be somewhere in the heater plenum, probably near the passenger's foot area.

If the blower doesn't run at all, check for voltage at the blower motor with a meter or test light, switch in all positions, keyswitch ON. The blower motor may have failed.

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Heater fan (blower motor relay) is stuck in the run position. Take it out and replace.

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I have a 1994 Chevy Silverado and every time I turn on the ignition, the knocking noise begins from under the dash somewhere. If I remove the fuse to the a/c/heater it doesn't make a sound when I


Try starting the truck so it makes the noise.
Then switch the air control to "fresh".
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2003 Chevy silverado heater fan won't shut off after truck engine is turned off. How do I turn it off?


This is a problem with the blower motor module. It needs replaced it is located on the passenger side under the dash by the blower motor. You can unplug this and it will turn off.

Jan 10, 2011 | 2003 Chevrolet Silverado 1500

1 Answer

Tapping noise near computer 1994 Chevy 1500 Silverado


air recir actuator motor shorted you can reach between blower motor and heater case and unplug a pain to replace

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Sounds like either a blend door actuator or temp. door actuator.

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2003 silverado heater fan won't shut off after truck engine is turned off


Your blower motor relay switch is most likely your problem. Its a common problem with a wide range of vehicles. In your truck it should be located under the dash up behind the glove box. I work at a GM dealer in the service department, and I want to say they cost under $100.

Feb 21, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

2004 Chevy Silverado Heater Switch


It could be the switch or your blower motor resistor.

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