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Electronics Experts - Honda Civic AC/Heater Blower #4676393
02/24/18 11:20 AM
02/24/18 11:20 AM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,203
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


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676419
02/24/18 11:46 AM
02/24/18 11:46 AM
Joined: Aug 2017
Posts: 664
MN
14Accent Offline
14Accent  Offline
Joined: Aug 2017
Posts: 664
MN
That's just a fancy name for the blower resistor. Why not just get a new one? They're cheap.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676436
02/24/18 12:08 PM
02/24/18 12:08 PM
Joined: Jan 2011
Posts: 2,833
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,833
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.

Last edited by Lubener; 02/24/18 12:08 PM.

The "thinking" man's friend.
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676442
02/24/18 12:10 PM
02/24/18 12:10 PM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,203
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.


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: Lubener] #4676443
02/24/18 12:11 PM
02/24/18 12:11 PM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,203
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?


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676463
02/24/18 12:26 PM
02/24/18 12:26 PM
Joined: Sep 2015
Posts: 1,595
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,595
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.

Last edited by mk378; 02/24/18 12:27 PM.
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676588
02/24/18 02:31 PM
02/24/18 02:31 PM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,203
VA
Does anyone know where can I buy a thermal fuse?


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676629
02/24/18 03:00 PM
02/24/18 03:00 PM
Joined: Mar 2016
Posts: 1,574
Toronto
PeterPolyol Online content
PeterPolyol  Online Content
Joined: Mar 2016
Posts: 1,574
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.


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676697
02/24/18 04:00 PM
02/24/18 04:00 PM
Joined: Sep 2015
Posts: 1,595
USA
mk378 Online content
mk378  Online Content
Joined: Sep 2015
Posts: 1,595
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.

Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676708
02/24/18 04:09 PM
02/24/18 04:09 PM
Joined: Dec 2016
Posts: 2,203
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,203
VA
I know TCO is bad, since I shorted it with a wire and now fan blower is working.


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676740
02/24/18 04:36 PM
02/24/18 04:36 PM
Joined: Dec 2006
Posts: 976
midwest
JamesBond Offline
JamesBond  Offline
Joined: Dec 2006
Posts: 976
midwest
Is this the same part as a $20 blower motor resister that I could buy on rockauto?

Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: mk378] #4676742
02/24/18 04:39 PM
02/24/18 04:39 PM
Joined: Mar 2016
Posts: 1,574
Toronto
PeterPolyol Online content
PeterPolyol  Online Content
Joined: Mar 2016
Posts: 1,574
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


Scambling for solutions is a hopelessly futile endeavour and potentially dangerous, without first coming to a solid, personal understanding of the problem. Beware riding the ideological hobby horse.
Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: maverickfhs] #4676845
02/24/18 06:45 PM
02/24/18 06:45 PM
Joined: May 2004
Posts: 2,494
Northeast
sxg6 Offline
sxg6  Offline
Joined: May 2004
Posts: 2,494
Northeast
I'd just replace that blower motor resistor since it's only about $20 for a new one..

Re: Electronics Experts - Honda Civic AC/Heater Blower [Re: mk378] #4677221
02/25/18 05:01 AM
02/25/18 05:01 AM
Joined: Jan 2011
Posts: 2,833
N.Ohio
Lubener Offline
Lubener  Offline
Joined: Jan 2011
Posts: 2,833
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.

Last edited by Lubener; 02/25/18 05:04 AM.

The "thinking" man's friend.

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