elwesso
Super Moderator
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31186 posts
94 Q45t 5 speed NICO Track Slut
Anderson and Angola IN
2-23-2003
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| « Re: HVAC Problem (DebbiQ) | 8:24 PM 4/6/2005 |
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Behind the glove box there is a resistor thing that often fails, its called the blower amplifier or something like that, and it detects the fan speed..... When it happens the fan is always on full blast....Part is about $60 new, i have a used one that works (and others do as well, post up a "want to buy" thread in the INFINITI SHOPPING MALL The sunload sensor will throw a code if its not in the sun!!! Welcome to NICO!
SHIFT_it yourself
1994 Q45t- 5 Speed
The Infiniti Q45 Resource, Q45.org | Nissan VH series website
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DebbiQ
Offline
28 posts
1992 Q45
Willits CA
4-6-2005
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| « Re: HVAC Problem (elwesso) | 9:09 PM 4/6/2005 |
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Thanks Wes.
I've read about a darlington transistor and fan relay. Can you clarify a little? Still I'm confused by the fact that the fan is on (and blowing thru defroster vents) when the system is supposed to be off. We've got a parts car here, so wouldn't mind doing some parts swapping for diagnosis.Thx, Debbi
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maxnix
NICO Supporter
Offline
21169 posts
1995 Q45, 1995 Q45t, 2000 Q45
Austin TX
7-22-2002
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| « Re: HVAC Problem (DebbiQ) | 9:40 PM 4/6/2005 |
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There is a thread on this with pictures. From your description, I am wondering if your display is out also.
Brian
1995 Q45 & Q45t & 2000 Q45
Discover the power of the button!
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DebbiQ
Offline
28 posts
1992 Q45
Willits CA
4-6-2005
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| « Re: HVAC Problem (maxnix) | 10:09 PM 4/6/2005 |
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The display works when we turn the system on but the fan runs even when the system is off and no display. I have done several searches before even posting and have not seen the thread with pictures. Can you direct me to it?
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maxnix
NICO Supporter
Offline
21169 posts
1995 Q45, 1995 Q45t, 2000 Q45
Austin TX
7-22-2002
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| « Re: HVAC Problem (DebbiQ) | 10:09 AM 4/7/2005 |
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Try http://forums.nicoclub.com/zerothread?id=99467 and http://forums.nicoclub.com/zerothread?id=63020
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elwesso
Super Moderator
Offline
31186 posts
94 Q45t 5 speed NICO Track Slut
Anderson and Angola IN
2-23-2003
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| « Re: HVAC Problem (DebbiQ) | 1:26 PM 4/7/2005 |
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| Quote, originally posted by DebbiQ » | Thanks Wes.
I've read about a darlington transistor and fan relay. Can you clarify a little? Still I'm confused by the fact that the fan is on (and blowing thru defroster vents) when the system is supposed to be off. We've got a parts car here, so wouldn't mind doing some parts swapping for diagnosis.Thx, Debbi |
The reason is when everything is turned off, it directs some air (as your moving) through the defrost so that the windshield wont fog as easy... Check those threads that Brian posted and give it a try, and let us know how it wokrs for you!
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DebbiQ
Offline
28 posts
1992 Q45
Willits CA
4-6-2005
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Thanks alot guys. Was indeed a bad fan control amplifier.
Debbi
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Q45tech
Q45 Guru
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13901 posts
1990 Q45 325,000 miles 19.9 years ownership
Marietta , Georgia
4-30-2002
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| « Re: (DebbiQ) | 3:53 AM 4/8/2005 |
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A bad [failed] fan speed controller is caused by a bad worn out fan motor.
The motor will usually take out a new controller if the fan motor is not changed soon!
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http://www.t3atlanta.com/
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maxnix
NICO Supporter
Offline
21169 posts
1995 Q45, 1995 Q45t, 2000 Q45
Austin TX
7-22-2002
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| « Re: (Q45tech) | 9:29 AM 4/8/2005 |
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And I recall they are about $200 form Joe, and a lot of labor.
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elwesso
Super Moderator
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31186 posts
94 Q45t 5 speed NICO Track Slut
Anderson and Angola IN
2-23-2003
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| « Re: (maxnix) | 1:10 PM 4/8/2005 |
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The fan motor is easy to do... Took me about 15 mins.....
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cjshaw
Offline
1 posts
infiniti q45
salinas ca
10-11-2008
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| « Re: HVAC Problem (elwesso) | 10:08 AM 10/13/2008 |
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elwesso:
Came across a post for fan motor problem you helped solve on a Q in 2005, motor was running full blast and would not shut down. My problem is a fan motor that suddenly won't run, display shows ok but no fan at any speed. Our 1993 Q with about 195,000 has been virtually trouble free! Any suggestions?
J&C
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Q45tech
Q45 Guru
Offline
13901 posts
1990 Q45 325,000 miles 19.9 years ownership
Marietta , Georgia
4-30-2002
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| « Re: HVAC Problem (cjshaw) | 10:54 AM 10/13/2008 |
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My first fan motor lasted 10 years and 190k, pulled a used one from a 95Q, it lasted 4 years, pulled another used one and that one is starting to make noise.The motors and their brushes have a finite life.
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