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25 amp HVAC fuse keeps blowing.

I tried unplugging the blower motor, but the fuse blew in the acc position. Any suggestions as to the next steps for troubleshooting would be appreciated.

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  • Jason Oct 31, 2012

    The problem is on a 93 Camaro.

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  • Contributor
  • 3 Answers

Replace the blower motor. Chevy is notorious for blower motors.. It seizes up, draws too much current then the fuse goes.

Posted on Oct 31, 2012

  • Jason Oct 31, 2012

    But the fuse is blowing with the blower motor unplugged, Joe.

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6 Suggested Answers

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Posted on Jan 02, 2017

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relaga58
  • 158 Answers

SOURCE: Wiper fuse keeps blowing intermittently.

It looks like the wire circuit for the wiper motor is touching the car body when shaken so the only thing you can do is shake the wires and terminals yourself while engine is running then maybe you can pinpoint where the earthing is.

Posted on May 08, 2009

johnny5846
  • 379 Answers

SOURCE: 1992 cadillac deville - hvac blower motor does not shut off.

replace the relay , when a relay sticks like that , a good test is to slap it with something like the handle of a screw driver , see if it un-sticks , its not a fix , just a test . cheers'

Posted on Jan 13, 2009

  • 1244 Answers

SOURCE: EFI 15 amp fuse keeps blowing, any suggestions?

you either got a shorted wire to the injectors or a injector stuck! or shorted

Posted on Jan 18, 2010

sisadsl
  • 1508 Answers

SOURCE: ACC fuse blew & radio and clock stopped working

there is a short somewhere in the acc circuit, probably not in the radio\clock, check anything else on the circuit like interier lights,

Posted on Apr 17, 2010

Testimonial: "Great response!"

csmock132
  • 4669 Answers

SOURCE: I HAVE A F150 AC BLOWER IS NOT WORKING

Does it blow the fuse if you unplug the blower motor. The motor might be shorted.

Posted on Jul 08, 2010

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1 Answer

Can anyone tell me where the fuse and/or relay is located for the blower motor on a 2005 Buick LaCrosse


First off , does it work on any speed ? After looking at a wiring diagram I find out your vehicle has a Blower motor control processor , a module ! That is your problem ,more then likely !
DEFINITION: The blower motor is inoperative in all speed positions.

1

Did you perform the Diagnostic System Check - Vehicle?
--
Go to Step 2
Go to Diagnostic System Check - Vehicle

2

  1. Turn ON the ignition, with the engine OFF.
  2. Place the blower switch in each speed position.
Does the blower motor operate in any of the speed positions?
--
Go to Blower Motor Malfunction
Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the blower motor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the blower motor supply voltage circuit and the blower motor control circuit.
  5. Place the blower motor switch in the minimum speed position.
Does the test lamp illuminate?
--
Go to Step 9
Go to Step 4

4

Test the battery positive voltage circuit of the blower motor control processor for the following:
?€¢
An open


?€¢
A high resistance


?€¢
A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 15
Go to Step 5

5

Test the ground circuit of the blower motor control processor for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
--
Go to Step 15
Go to Step 6

6

Important: Ensure that the blower motor control processor connector and the HVAC control module connectors are connected during this step in order to avoid misdiagnosis.

  1. Measure the voltage from the blower motor speed control circuit at the HVAC control module to a good ground.
  2. With the ignition ON, turn the blower motor to high then to OFF.
Does the voltage measure near the specified values?
5 V OFF
1 V ON
Go to Step 10
Go to Step 7

7

  1. Turn OFF the ignition.
  2. Disconnect the HVAC control module.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the blower motor speed control circuit of the HVAC control module to a good ground.
Does the voltage measure near the specified value?
5 V
Go to Step 11
Go to Step 8

8

Test the blower motor speed control circuit of the HVAC control module for the following:
?€¢
An open


?€¢
A short to ground


?€¢
A short to voltage

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 15
Go to Step 10
If your not familiar with trouble shooting automotive electrical circuits I suggest you take it to a ASE certified repair shop !

Jan 07, 2016 | Buick Cars & Trucks

1 Answer

My bloer motor does not worki replasd the fuse but it blew the fuse


When a fuse blows,replacing it, usually results
in it blowing again

IT BLOW FOR A REASON-- did it not

Now-- IF-- you had a wiring diagram of the blower
& it's control circuit, you could diagnose the problem

I would unplug the blower or take it out & test it to see
if that is the only issue

Oct 08, 2014 | Cars & Trucks

2 Answers

Keep blowing the A/C fuse


BY you references to what you have done you have eliminated to fault to the front blower . So I suggest that you concentrate your efforts there. The motor be seized up and is drawing excessive current just to work. There may be a problem with the motor speed control shorting out,or a power wire to the motor worn though and shorting out to an earth point.

Mar 15, 2014 | 2003 Mercury Mountaineer

1 Answer

Heater fan not working - 30 amp HVAC fuse blows out repeatedly when replaced. Where should I look for root cause? Have dash disassembled, but can't see any bare wires anywhere behind radio/climate...


Try unplugging the blower motor, heater control unit and blower motor resistor. Replace the fuse then reconnect the items 1 by 1 and see what pops the fuse.

Oct 19, 2013 | 1997 Pontiac Grand Prix

1 Answer

The heater fan fuses on my 2002 impreza outback keep blowing when I turn on the fan what can cause this? I think I can hear the relay working.


Unplug the blower motor & see if the fuse blows

Then you know the answer or continue to other
items in that circuit

Feb 01, 2013 | 2002 Subaru Impreza

1 Answer

I have a 2000 Nissan Xterra and the 2 blower fuses keep blowing causing the the heat not to work. When I went to switch out the fuses the first time the motor and heat worked right away but only for a...


you have a problem with the motor circuit drawing more amperage than the fuse will allow. it could be the motor itself, or something that is keep the motor from turning freely. otherwise it's a wiring problem. i would suggest unplugging the motor, and then turning on the fan. hopefully, if there is some short to ground, which sounds unlikely, the fuse will blow. otherwise i suggest replacing the blower motor. good luck!

Jan 13, 2011 | Nissan Xterra Cars & Trucks

1 Answer

I HAVE A F150 AC BLOWER IS NOT WORKING


Does it blow the fuse if you unplug the blower motor. The motor might be shorted.

Jul 08, 2010 | 2004 Ford F150

3 Answers

My canyon,s heater motor only works on high, is there a relay switch that has gone bad?


the blower motor resistor is bad it is under dash on passenger side

Feb 17, 2010 | 2006 GMC Canyon

1 Answer

Recently my wife was driving to work during a summer afternoon here in AZ THe A.C. and blinkers quit working, and blew out the blue-colored 15-amp fuse. I have checked what I know but cannot find the...


was this fuse for the a/c compressor or was it for the blower motor? did you replace fuse? did it blow out again? if blower motor fuse, blower motor may be dragging drawing excessive power, causing fuse to blow.

Jul 16, 2009 | 1999 Ford Crown Victoria

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