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acisdead
New User
Aug 29, 2012, 2:39 PM
Post #1 of 6
(7632 views)
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Fan not blowing at all
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Hey everyone.
I've got a 2001 Honda Civic EX. Everything was fine until one day, I started up the car while the AC was cranked up to high, it blew through the vents for a second and then suddenly stopped. Since then, no air will come from the vents on any settings (compressor on or off, cool or heat, etc.) Whenever I first start up the car, if I turn on the AC (press button and see green light) I hear something run for a moment and then stop (I assume that's the compressor). Regardless, the fan doesn't blow at all, no matter what.
The car shops wanted way too much money to even check it out, so I want to do it myself despite having very limited experience with such repairs. The easiest fix I knew of was the fuses, so I checked every fuse that relates to the AC or fan, and all seemed to be fine.
From online research, what I've gathered is that it's likely either the blower motor itself or the blower motor transistor/resistor. Seems others have had similar problems with the transistor, and just purchased a new one for 50 bucks, installed it, and everything worked again. I'm really hoping this is my problem because it sounds easy enough.
I opened up the under-glovebox compartment that houses the blower motor, air filters, etc., but I'm having trouble locating the blower motor transistor.
First off, any ideas on what the problem is?
Second, if it could be the blower motor transistor, does anyone know where that's situated in the 2001 Civic, or know of any good photos/diagrams online for that specific model for me to use to find it?
Thanks!
(This post was edited by acisdead on Aug 29, 2012, 2:40 PM)
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nickwarner
Veteran
/ Moderator
Aug 29, 2012, 4:44 PM
Post #2 of 6
(7594 views)
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Re: Fan not blowing at all
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   resistor looks like this  I would verify that you actually have power and ground to the blower first. If you do this $40 resistor will just waste your money. Get a 12v test light. You said the fuses seemed ok, but did you verify they had power to them first with a multimeter or a test light? If you have power at the resistor but not the motor, you would be looking at a bad resistor. If you have power and ground at the motor and it still won't run, you have a bad motor. Diagnosing is cheaper than throwing parts at it.
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 29, 2012, 4:44 PM
Post #3 of 6
(7592 views)
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Re: Fan not blowing at all
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I guess you have no problem throwing $50 away on a wild guess but won't pay a tech to tell you what is actually wrong? It can get real expensive just throwing parts at it without testing anything.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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acisdead
New User
Oct 1, 2012, 9:43 AM
Post #4 of 6
(7347 views)
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Re: Fan not blowing at all
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OK, I followed your advice and ran some tests. Came to the conclusion that it likely was the transistor. I replaced with a brand new transistor and the fan started working immediately on all speeds.
Thought the problem was fixed, but then after about 10-15 minutes of the fan blowing fine, it suddenly stopped again. I felt the new transistor and it felt pretty hot. Seems the part got blown.
What's most likely here? I'm thinking it could just be a problem with the blower motor itself drawing too much, but what other tests can I run to figure out what could be causing the transistors to blow?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Oct 1, 2012, 10:05 AM
Post #5 of 6
(7345 views)
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Re: Fan not blowing at all
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It might be drawing excessive power and would hope a fuse or fusible link would blow. That or a real squirrel is getting too much of a workout in the squirrel cage - just kidding but if that is messed up it would cause problems/overload,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 1, 2012, 10:21 AM
Post #6 of 6
(7340 views)
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Re: Fan not blowing at all
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You need to replace both the blower motor and the transistor. The excessive draw of the worn out motor is overloading the transistors.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Oct 1, 2012, 10:22 AM)
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