Mode control motor

[GOTTSPD]

Hi all.

I've spent the last 1.5 hours looking for information about this issue and haven't found exactly what I'm looking for.

I just got a new for me 92 NSX. The PO had told me that sometimes he would get this loud, annoying, fast clicking noise, which his mechanic diagnosed as the mode control motor (MCM)failing.

Has anyone else ever had to replace the MCM before? What were your cars symptoms?

Here are mine...

The hugely annoying clicking sound, it's a rather fast clicking. I've read that others have said it was a stuck vent door or something similar - goes away on its own generally. Sometimes it'll start again if I hit a bump in the road. I can make it stop if I click the defrost button.

Also... and I've got my fingers crossed that there are related problems... Sometimes the fan only works on high speed. Other times it works fine. I wonder if this is the capacitor problem or perhaps its low on freon???

Look forward to your replies.

-Michael

 

[Ennesssex]

Michael,

congrats on your new nsx, don't know much about the loud clicking noise coming from your car however, when the a/c intermittently turns on high only is a sign of a bad capacitator in your climate control board. Ask me how I know, I just pulled it out today for the same reason. You can either solder a new capacitor on yourself or send it out. I opted to send it out because I don't have much experience soldering or working with capacitors for that matter. Here is a couple helpful threads regarding this problem.

http://www.nsxprime.com/ubb/Forum10/HTML/000826.html

Or you can use the search function and type in "climate control failure".

Here is the place that I will be sending my climate control board to replace the bad capacitators.

Gerhard Langguth
LANGGUTH Electronics Inc.
711 East Parkway Inc.
Russellville, Arkansas 72801
(479)967-0873

They charge 100 to change the capacitors.

 

[guthesq]

Mode Control Motor Clicking

I have the same problem and symptoms on my '96. The MCM is located under the dash on the left side of the passenger side. I had the dealer replace it for about $200.