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Heater fan know not working - keeps blowing

Old 10-17-2018, 03:50 PM
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Heater fan know not working - keeps blowing

The fan speed knob is not working. Turning does not change fan speed (keeps blowing full blast), pushing off button only turns display off but fan keeps blowing at full tilt.
Any suggestions?
1991 NSX
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Old 10-18-2018, 09:25 AM
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Even with HVAC module unplugged and removed, the fan keeps running on full.
Suggestions where to start?
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Old 10-18-2018, 09:56 AM
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Video of HVAC blowing, even when pushing 'off' or using fan speed button.

https://www.dropbox.com/s/38cwf6ebiy...45544.mp4?dl=0
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Old 10-18-2018, 05:17 PM
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Originally Posted by KraftwerkTurbo View Post
The fan speed knob is not working. Turning does not change fan speed (keeps blowing full blast), pushing off button only turns display off but fan keeps blowing at full tilt.
Any suggestions?
1991 NSX
I'm betting these are the same as the rest of the Honda products of the era, and its got a bad blower motor resistor.
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Old 10-19-2018, 09:29 AM
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Originally Posted by Cboutilier View Post
I'm betting these are the same as the rest of the Honda products of the era, and its got a bad blower motor resistor.
I will start there.

Any good DIY links to take the blower resistor out?
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Old 10-23-2018, 10:01 PM
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KraftwerkTurbo , this is a classic symptom of the climate control board going bad because of old solder. Contact Brian K at Acura NSX electronics repair to get it repaired.

PS, welcome to AZ!
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Old 10-24-2018, 09:00 AM
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Originally Posted by neuronbob View Post
KraftwerkTurbo , this is a classic symptom of the climate control board going bad because of old solder.
CCU was send in for repair (by previous owner to Auto Tech Rescue)
Blower HI relay NOT stuck.
ONLY pulling the Power Transistor turn fan off.

Previous owner had cut the old transistor but left in housing. zip tied new transistor in. Appears transistor housing touching metal (here: alu coolant/ac pipes?) creates a short.

Removed old transistor (what a PITA that is; could not get heater hose off, rear screws is a killer). Put new transistor (ouch! $$$) in. Running now.

Have 'brother' car (this one manual, other is auto) with similar issues. Will first test relay and transistor. Then will contact above mentioned Brian for quote; seems he is resident NSX climate control guru?
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Old 10-24-2018, 07:37 PM
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Brian is the man. Even better, he charges reasonable prices. Glad the transistor change worked!
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