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Back pack blower on off switch is broke how can I fix It

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  • yadayada
    yadayada Feb 14, 2012

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I bought a basket case 95 Iszu pickup, my last issue is the blower motor will not run from the heater switch. The previous owner has run a direct wire from an unkown power source and added a toggle...


Usually, the 12V runs to a resistor pack mounted to the side of the blower motor. When you use the fan select switch, you change the load on the motor and it goes faster or slower. If the resistor pack is defective, that will cause the motor not to run.

You can pull the motor out and attach one side of the battery to the motor +12V side, and attach the ground to the (-) side of the motor to see if it comes on without going through the resistor pack. If it does, replace the resistor pack. If not, replace the blower motor.

The whole toggle thing sounds like a shortcut was taken to avoid fixing the initial problem.

Apr 19, 2011 | Isuzu Pickup Cars & Trucks

2 Answers

My heat is hot but doesn't blow. Is it the resistor, motor or something else? I checked my fuses they look fine.


Clear out the dust on the dial and slide control first.
MOVE these control back and forth and sensor for broken linkage and connecting rods.
If these are able to move smoothly then turn the back and froth and monitor for the flap / defector blending valve movement.
Pass a ShopVac to clean out all the dust.
==== The resistor pack for the blower motor can fail over time.
Check loose connector on blower and resistor pack around the firewall.

Please keep me up to date on the fix via email.

Jan 25, 2011 | 2001 Ford Focus

2 Answers

Blower motor only workson high speed


most likely your blower motor resistor pack. It allows you to have low medium and high speeds. If a winding is broke in the resistor pack, then it could only work on high

Jan 03, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

99 olds heater heats,but doesnt come on


CHECK HEATER AND AC IGNITION 10 AMP FUSE UNDER HOOD JUNCTION BOX.IF ALL IS GOOD CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL LOOKS GOOD. TURN ON CONTROL SWITCH TO CHECK TO SEE IF POWER GOING TO BLOWER MOTOR IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR FUSE AND RELAY GOOD.YOU HAVE BROKE WIRE BETWEEN SWITCH AND BLOWER MOTOR OR CONTROL SWITCH FAULTY. TO GET TO BLOWER MOTOR ITS LOCATED UNDER THE DASH ON PASSENGER BEHIND GLOVE COMPARTMONT YOU DONT HAVE TO REMOVE GLOVE BOX ITS JUST BELOW IT FAR BACK.YOU NEED TURN OFF RADIO FIRST THEN DISCONNECT NEGATIVE BATTERY CABLE WAIT 20 MINUTES THIS DISABLE AIRBAGS AND THE BCM.REMOVE BLOWER MOTOR HOTWIRE IT TO SEE IF ITS WORKS. IF NO BLOWER MOTOR NO GOOD.IF BLOWER MOTOR GOOD THE AC AND HTR CONTROL SWITCH IS BAD DEALERSHIP FIX.

Dec 30, 2010 | 1999 Oldsmobile Alero

1 Answer

Heater fan just quit working. Cant find a fuse for it anywhere. Checked the relay and the switch and they seem fine.


Blower Motor not working for all speeds or not at all.

What does it take to get air to come out the vents?

1. Power from the battery or alternator, wiring thru a fuse and possibly an accessory relay to the switch

2. Switch and wiring to channel voltage to the appropriate resistor corresponding to the desired speed

3. Resistor set to reduce voltage to the blower for settings less than high

4. Final wiring to blower and blower itself

Because there is usually no relay between the switch and the resistor, all of the blower current runs through the switch. This sometimes causes the switch to overheat and fail over time. Depending on how the switch is designed, the failure may allow multiple currents to run to the resistor pack, and this may in turn cause the resistor pack to overheat and fail. An example of the circuit I'm describing is shown below:


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Note that if the above switch was to contact both terminals 2 and 3 simultaneously, there would be more current than the resistor pack is designed for. This can burn the resistors and/or blow the thermal breaker. Also note that if the resistor pack fails, the blower can still run at full speed.

Troubleshooting: The last sentence above is a clue.

If your blower is working only on high speed, the likely cause is a failed resistor pack. However, because of the other discussion above, you should also troubleshoot the switch to see if it is the reason the resistor pack failed.

If the blower does not work at all, odds are that the problem is the fuse, relay, or the motor itself.

Repair: The resistor pack is installed in the air stream of the system to help cool the resistors. It is usually accessible from under the dash on the passenger's side or sometimes from the engine compartment along the firewall. It is identifiable by the connector with several wires coming out-some going to the switch and some to the blower motor. The resistor is replaced by unscrewing it from the duct and reinstalling the new resistor pack.

The blower is usually accessible from above the passenger

Sep 21, 2010 | 1984 Toyota Celica Supra

2 Answers

Im trying to troubleshoot a non-funtioning blower


To test the blower motor run a jumper wire from the hot side directly to the hot terminal on the battery. If the motor is in good condition it should come on. If it comes on that may indicate a bad resistor pack. Since the resistor is an electrical part which is self-contained would probably be easier to change than to test. You should do the resistor pack first (before the switch) because it is the easier of the two to change out. If replacing the resistor pack does not fix the problem then you will need to replace the switch.

Jul 23, 2010 | 2000 Isuzu Trooper

1 Answer

Front blower only works on high, what part do i


There are two things I can think of that may be causing your problem. First the blower switch in the dash may be bad if you do not have an electronically controlled blower, if you do it could be the control unit itself, but usually they stop working alltogether. The other part which may be bad is the resistor pack on your blower motor.

If your blower has four speeds on it like most blowers these days then this resistor pack will have four resitors mounted on it. They look like coiled wires. These resistors vary the voltage coming from the blower switch so you have different blower speeds. Kinda acts like a filter dropping the voltage for the lowest blower speeds incrementally.

If you want to diagnose this yourself it shouldn't be too hard. You will need a 12 volt test light or a multimeter to test for voltage. The blower motor should be located unther the hood of your vehicle on the passenger side against the firewall. It looks like a round black box with wires going to it. Where the wires connect to it the resistor pack is on the other end of the connector inside the motor housing. There are usually two screws or bolts holding it into the housing. If you take these bolts out it should come right out. You can visually inspect it and you may notice some charring on the circuit board where the resistors are.

I would measure power with you test light from the connector before it goes into the resistor pack. If you are receiving power at all blower settings then your blower switch is likely good since this feeds the signal to the blower motor.

You can then use a multimeter to ohm out the resitors on the resistor pack. If any of them show to be open you have a bad resitor coil there. You have two options at this point, you can unsolder the old resitors that are bad and try and replace them with comparable resitors from radio shack. Or you can go to rockauto.com and order a new resitor pack. They run about $16.00-$20.00.

Apr 08, 2010 | 2001 Dodge Grand Caravan

1 Answer

Blower Motor doesn't work in Heat or AC in a 1999 Ford F250 Super Duty.


If it is not workring at all, including all speeds then i would say blower motor is broke and needs replaced. But first check your fuse panel for a blown fues. It is located under your steering column. Your book will tell you which fuse runs it. Then try unhooking the wire harness from the blower motor so that the motor is not connected to anything. Run a groung wire to the ground side and a hot 12 Positive wire to the other wire and see if it comes on. If it does not then replace it. If it does then you need to look elsewhere.... IE switch, resistor pack relay, or even possibly wiring.

Jan 23, 2010 | 1999 Ford F250 Regular Cab

1 Answer

Fan motor on ac run only high and low Mechanical switch Police interceptor 2004


If the blower motor will only run on high it is 95% certain that the Blower Motor Resistor Pack has failed. The fix is to replace it. There is a 5% chance the blower motor speed control is bad but unlikely.

Nov 10, 2009 | Ford Crown Victoria Cars & Trucks

1 Answer

Only one speed on my 98 wrangler blower switch


Check the connector at the resistor. It's probably melted or the terminals have spread. You may need to trace it back a foot or so also. There may be a wire that got hot and broke inside the insulation. Look for discoloring.

Apr 12, 2009 | 1998 Jeep Wrangler

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