Post by
alperazzoli »
https://forums.nicoclub.com/alperazzoli-u104726.html
Mon Aug 09, 2010 6:02 am
I'm almost finished with the HID projector retro and am already thinking about a couple of issues with this 'ere project:
The DCC's logic uses a few sensors, namely ambient temp sensor (already installed at least for my S trim which has a trip computer), in-car temp sensor, evaporator temp sensor, sunload sensor. Installing all of these seem to be no problem, except for the evaporator sensor. And I also have a doubt regarding the in-cabin sensor's aspirator. The sensor could theoretically be installed without the aspirator, but I reckon it isn't The Right Thing To Do™.
1) Evap sensor: I did some research, it seems our cars use an evaporator *switch*, i.e., it is a sensor and switch in its own right, therefore providing no temp signal at all. It either: a. sends a simple on-off signal to the manual A/C panel, or b. switches the compressor itself based on the temp threshold. I can't remember clearly, will have to search through the FSM again. Either way is not good for us because with the DCC, the own digital A/C panel's microcontroller decides when to switch off the compressor based on the evap's temp, which is constantly informed by the evap sensor giving different resistance readings according to the temperature. And if the factory installed switch really behaves as described above, it will have to be replaced by a sensor (I already have the Maxima's sensor ordered new from a dealer). The big problem is: it seems I will have to take off the evap to install this sensor. This is a HUGE hassle - according to the FSM, we have to remove the expansion valve and thus aircon coolant gas has to be taken off the system in order to remove the evap. Any thoughts whether it would be possible to do it without messing with the expansion valve? It would mean a trip to the $$tealer, my pocket hurts upon the very thought of it.
2) The in-cabin temp sensor works with an aspirator which sucks a very small amount of cabin air through the sensor constantly. The aspirator is mounted in a hole on the A/C airbox, and air flowing in there makes the aspirator work. I wonder what is the right spot for drilling it so that the aspirator works correctly? Anybody can give an input?
That's all for now. Waiting on your comments!