Heater knob not working..

209 Views 12 Replies 4 Participants Last post by teahead, 12 d ago

Spricer90

Discussion Starter · 16 d ago

My knob that turns on the fan to blow heat and cold air randomly stopped working completely after it had been working only on full blast since I bought it about 8 months ago... what do i do to figure out how to fix it? Any ideas?

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Nitrogen

· #2 · 16 d ago

if the carbon brushes in the motor have worn down or are getting stuck (which is common) then the first thing to try is
switch the blower onto full power and when it stops, give the blower motor housing a thump with your hand (not a hammer) this will usually jolt the brushes loose and reconnect the electrical circuit, if the motor starts turning again then most likely its the motor,
another common issue is the resistor pack which controls the speed of the blower motor, these can be burnt out or have a bad connection,

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Spricer90

Discussion Starter · #3 · 16 d ago

Nitrogen said:
if the carbon brushes in the motor have worn down or are getting stuck (which is common) then the first thing to try is
switch the blower onto full power and when it stops, give the blower motor housing a thump with your hand (not a hammer) this will usually jolt the brushes loose and reconnect the electrical circuit, if the motor starts turning again then most likely its the motor,
another common issue is the resistor pack which controls the speed of the blower motor, these can be burnt out or have a bad connection,

I just replaced the blower motor and it worked for a couple months now the knob stopped turning it on all together.

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Nitrogen

· #4 · 16 d ago

i would suspect the resistor pack, maybe ask whoever replaced the blower motor to check the resistor pack and its connector,

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Spricer90

Discussion Starter · #5 · 16 d ago

Nitrogen said:
i would suspect the resistor pack, maybe ask whoever replaced the blower motor to check the resistor pack and its connector,

Thank you! I'm going to check the resistor later today.

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Spricer90

Discussion Starter · #6 · 15 d ago

So changed the resistor and now the knob won't turn it on to blow again... any suggestions???

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Nitrogen

· #7 · 15 d ago

did you buy a new resistor pack and change it ?
check fuse M15

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Spricer90

Discussion Starter · #8 · 14 d ago

Yes bought a resistor. I'll check fuse M15 today also... how do I tell if the fuse is bad? Is it under the hood in that black box looking thing?

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Dadsride2007

· #9 · 13 d ago

Have a 2007 . Mine was the tipm. No fuse for the blower motor. The hot wire is direct from the tipm to the blower motor. Power was going in and out. Ground controls fan speed.

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Spricer90

Discussion Starter · #10 · 13 d ago

What's tipm? How did you fix it?

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Nitrogen

· #11 · 13 d ago

here is the thread that he got his advise from

Heater Blower Motor

I have a 2007 with 104000. The blower motor doesnt always work. When it works all speeds work and blows air just fine. Yesterday while it wasnt working i had no power to fan switch. After restarting the car everything worked fine for my entire drive home.Third time it has done this.Is there a...

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