Electrical Diablo Predator And Fan Speed Adj.

Hi, I just got my self a diablo predator for my 03 GT V8.
I installed the tune and every works just fine

what I am here for is the fan speed,

I live in Qatar, and as if you know it , you will know that it's a too hot place , right now without any modifications with the parameters the temperature is in the middle +- one bar.

I want to make it cooler , what is a good tune for the fan high/low speed sitting, " put in considirations that I don't know a lot about this diablo , so please try to make it as simple as you can ,

as far as i know there is 5 things I can adjust
Fan high speed ECT 1 ON Fan low speed ECT ON
Fan high speed ECT 2 ON Fan low speed ECT OFF
Fan high speed ECT OFF
if you can simple it for me , and what would be the coolest sitting for my hot weather .


one more thing,

my battery keep dieing I took it to battery company they took a look they said I have something that is consuming the power while the car is off, they put a voltage meter on the NEGATIVE termanal and they found that the value is jumping between 0.3 and 1.3V... how can I know , or just get a hint where could be the problem .

thank you so much

ehm... as stupid as this might sound, but I have to say it,

right now I have a multimeter , "yet still not sure how to use it" would you please tell me how to use this multimeter to do that test you want, "mean which section should I put it on , if you can provide a photo would be great,
thanks ., sorry for all the troubles .