CCU maybe?

[onechou2304]

Hi,
I have some trouble with my 1991 NSX.
when i start it for the 1st time, the CCU display doesn't work.
After 5 or 10 mins driving (maybe the temperature or vibrations?) , the screen lights up;
and sometimes the Fan button and the temperature button seems to work, sometimes no. The blowing start but the temperature doesn't work.
But in any case, there is no heat blowing in the car (sometimes there is cold air but not from the A/C).
I think that the AC should be empty (the car doesn't drive since 2008).

For people who knows, is it symptom of a CCU out of order?
Did you have any contact of people specialized in reparation of CCU (tested by people of the forum)?
I am in France, so a repairman in Europe would be great.

Many thaks for your help.

 

[goldNSX]

As already stated in the other thread, your CCU needs a rebuilt. Maybe Kaz in the UK is doing this. I used to do that job before but don't do it anymore.

 

[hondasash]

There are also some guys in Germany doing that- please check european forums if needed.
E.g hondaboard

Had the same issues when buying my X years ago... let it being repaired and it works like new

 

[onechou2304]

There are also some guys in Germany doing that- please check european forums if needed.
E.g hondaboard

Had the same issues when buying my X years ago... let it being repaired and it works like new

great!!!
is it people from http://nsxe-repair.com?

 

[hondasash]

http://www.hondaboard.de/index.php?page=Thread&postID=195068

 

[neuronbob]

great!!!
is it people from http://nsxe-repair.com?

This is [MENTION=7588]Briank[/MENTION] , who is in Wisconsin, USA. He is still actively repairing CCUs. Reach out to him here or on the NSX Facebook groups.

 

[Honcho]

Hi,
I have some trouble with my 1991 NSX.
when i start it for the 1st time, the CCU display doesn't work.
After 5 or 10 mins driving (maybe the temperature or vibrations?) , the screen lights up;
and sometimes the Fan button and the temperature button seems to work, sometimes no. The blowing start but the temperature doesn't work.
But in any case, there is no heat blowing in the car (sometimes there is cold air but not from the A/C).
I think that the AC should be empty (the car doesn't drive since 2008).

For people who knows, is it symptom of a CCU out of order?
Did you have any contact of people specialized in reparation of CCU (tested by people of the forum)?
I am in France, so a repairman in Europe would be great.

Many thaks for your help.

Kaz in the UK is your best choice, since you are in France. Shipping to BrianK in the US will likely be more cost, but not sure how Brexit is affecting mail between France and UK. Both do a very high-quality level of repair on the NSX electrical components. I saw your other thread and you may also want to have Kaz look at your radio too-I'm fairly sure he can repair them.

 

[onechou2304]

Kaz in the UK is your best choice, since you are in France. Shipping to BrianK in the US will likely be more cost, but not sure how Brexit is affecting mail between France and UK. Both do a very high-quality level of repair on the NSX electrical components. I saw your other thread and you may also want to have Kaz look at your radio too-I'm fairly sure he can repair them.

many thanks Honcho

 

[onechou2304]

For the specialists of the forum, just to be sure: the trouble with my NSX is that I don't have any heath in the habitacle; the CCU works randomly the display and all the fonction works but 18 or 28° there is no heath. and the blowing works only on very high blow. The function of changing mode works (head, feet, recycle)...
And I think that AC doesn't work at all because there is a lot of mist in the habitacle when I drive (normally the mist diseapear with AC).
Is the heath in the car working with AC? if there is no gas in the AC, there is no heath?
Thanks for your comments

 

[Old Guy]

Did you do the self testing function check for the CCU which is described in the owner's manual and the service manual? If you did that test and the CCU checks out as good, then give consideration to the following:

For the no heat problem
- is the engine coming up to full operating temperature (the dash temperature gauge is at mid point)? If the engine is not getting hot the interior heater will not generate heat.
- is the heater control valve opening? The heater control valve may be stuck closed. The cable which operates the heater control valve may have come loose so that even though the CCU is trying o open and close the valve nothing is happening. Refer to the service manual for the location of the heater control valve if you don't know where it is - it isn't that hard to find.

If the blower only works on high speed it is possible that the blower power transistor has failed. Refer to this diagram for the wiring of the blower control.



The service manual describes procedures for testing the power transistor. If the power transistor has failed original replacements are fairly expensive. It is possible to replace the transistor inside the module for a lot less money if you are prepared to dig and scrape out the insulating compound. A partial failure of the CCU may also cause the same problem; but, if the CCU passes its self test then check the power transistor.

If the failure of the air conditioning to operate is caused by loss of refrigerant in the AC system that will not cause your problem with no heat. A 1991 car that has not been driven since 2008 has likely lost all of its refrigerant. If you have loss of refrigerant do not try to operate the AC system. Either purchase the correct gauge or have an AC specialist check the pressure of the AC system to confirm that you have lost refrigerant.

 

[Heineken]

For more background information about the CCU and the self tester routine, you can refer to my write-up in the NSX UK forum: http://www.nsxcb.co.uk/entry.php?2632-Climate-Control-Unit-(CCU).
The trouble you described sounds a lot like leaking capacitors to me. The repair and replacement procedure can be found here: http://www.nsxcb.co.uk/entry.php?2633-Climate-Control-Unit-(CCU)-Capacitor-Replacement
The write-up can be used to check your CCU whether it does suffer from it. If yes, don't waste any time getting it repaired by someone in Europe and familiar with the topic.

 

[onechou2304]

hi people! i am so happy today; I received yesterday from Japan a new CCU; today, sunny weather, I install it in my NSX and......It work :smile:. everythink works. blower and heather!! no more mist in the car. and, I thinkthe AC works too (the car didn't use since 2010). I heard the AC compressor starting and stoping when I push the button (I can't check if I need to refill it or no).

 

[Heineken]

Good to hear more good news from your side :smile:.