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#4676393 - 02/24/18 11:20 AM Electronics Experts - Honda Civic AC/Heater Blower
maverickfhs Offline


Registered: 12/28/16
Posts: 2055
Loc: VA
So today AC/Heater blower fan stopped out of the blue for my 2003 Civic, was working flawlessly.

Based on quick search, seems like an issue :

https://honda-tech.com/forums/honda-civic-2001-2005-78/diy-how-fix-ac-power-transistor-2041582/

Does anyone know if soldering a resistor safe or no? Should I use a thermal fuse or a plain wire? Radioshack is gone, anywhere else I can locally get the part?

I have already removed the part and getting an infinite resistance between 2 contacts.

Thanks for the help thumbsup
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2006 Civic EX 200K/AT
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#4676419 - 02/24/18 11:46 AM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
14Accent Online   content


Registered: 08/03/17
Posts: 425
Loc: MN
That's just a fancy name for the blower resistor. Why not just get a new one? They're cheap.
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#4676436 - 02/24/18 12:08 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
Lubener Offline


Registered: 01/22/11
Posts: 2604
Loc: N.Ohio
That's no transistor. The thermistor is likely for current limiting. The thermistor will change resitance with temperature. They are cheap and I would just get the original part.BUT if you are determined,you could put a fixed resitor(of proper resistance and power rating) in its place. I wouldn't just place it across the thermistor without removing it. If that thermistor is good and you place a fixed value component in parallel with it, you would lower the overall resistance in the circuit causing a problem.


Edited by Lubener (02/24/18 12:08 PM)
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#4676442 - 02/24/18 12:10 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2055
Loc: VA
Thanks, looking at another link: http://forums.clubrsx.com/showthread.php?s=f28a1734133081dd4bd4a552dde60da6&t=506999

He just shorted out both links? If not, can I just use a thermal fuse as per this: update: the defective part is called MICROTEMP rated at 2 Amp 114 degrees Celsius, the same part you'll find in Electric iron.
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2006 Civic EX 200K/AT
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#4676443 - 02/24/18 12:11 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: Lubener]
maverickfhs Offline


Registered: 12/28/16
Posts: 2055
Loc: VA
Originally Posted By: Lubener
That's no transistor. The thermistor is likely for current limiting. The thermistor will change resitance with temperature. They are cheap and I would just get the original part.BUT if you are determined,you could put a fixed resitor(of proper resistance and power rating) in its place. I wouldn't just place it across the thermistor without removing it. If that thermistor is good and you place a fixed value component in parallel with it, you would lower the overall resistance in the circuit causing a problem.


Not sure, how easy is to remove the thermistor?
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2006 Civic EX 200K/AT
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#4676463 - 02/24/18 12:26 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
mk378 Offline


Registered: 09/27/15
Posts: 1444
Loc: USA
The module depends on airflow from the fan to not overheat. Check for mouse nest in the ductwork, blocked cabin air filter, failing motor bearings, etc. that caused the overheating in the first place.


Edited by mk378 (02/24/18 12:27 PM)

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#4676588 - 02/24/18 02:31 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2055
Loc: VA
Does anyone know where can I buy a thermal fuse?
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2006 Civic EX 200K/AT
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#4676629 - 02/24/18 03:00 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1351
Loc: toronto
Do you have an electronics component store near you? There are a couple of online vendors like Mouser but I've never ordered from them.


On a side note, if it's a standard 4 speed blower (not continuously variable) then I only ever replace the resistor packs with this 'solid ceramic block' style


They're the most reliable units I've ever dealt with. Last conversion was on a GM with that stupid thin PC board style resistor, where several watts of heat are supposed to dissipate through a freakin circuit board. Glad I'll never have to go back in there ever again.

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#4676697 - 02/24/18 04:00 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
mk378 Offline


Registered: 09/27/15
Posts: 1444
Loc: USA
These are a transistor not a resistor. The control panel has a click knob with 4 speed settings, but internally it is digital and uses PWM to the transistor.

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#4676708 - 02/24/18 04:09 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2055
Loc: VA
I know TCO is bad, since I shorted it with a wire and now fan blower is working.
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2006 Civic EX 200K/AT
2006 Acura TSX 177K/AT

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#4676740 - 02/24/18 04:36 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
JamesBond Offline


Registered: 12/13/06
Posts: 859
Loc: midwest
Is this the same part as a $20 blower motor resister that I could buy on rockauto?

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#4676742 - 02/24/18 04:39 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: mk378]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1351
Loc: toronto
Ah thanks mk378, I didn't know what style it used. Seems Honda consolidated down to a single logic-based part, regardless of trim level/market ie. fixed speeds vs variable fan auto climate control

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#4676845 - 02/24/18 06:45 PM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs]
sxg6 Offline


Registered: 05/23/04
Posts: 2481
Loc: Northeast
I'd just replace that blower motor resistor since it's only about $20 for a new one..

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#4677221 - 02/25/18 05:01 AM Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: mk378]
Lubener Offline


Registered: 01/22/11
Posts: 2604
Loc: N.Ohio
Originally Posted By: mk378
These are a transistor not a resistor. The control panel has a click knob with 4 speed settings, but internally it is digital and uses PWM to the transistor.

Transistors have three leads or two and the case(collector), I do not see that in the picture. As suggested, I would just get an OEM part and be done with it.


Edited by Lubener (02/25/18 05:04 AM)
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