Aslam o Alequm
Dear Sehzad,
I feel pleasure ti helo you niw problem. You just have to open the back seat there is a blower which control the batteries temperature. After removing the seat yoy will see it. On front side there are three lock remove them and remove the blower 3 nuts. After that yau can take it out. At section side of blower there is mesh which will be blocked just like home AC filters just clean it.
In Sha Allah your fielder will be perfect. 
And sometimes when you parked car in direct sunlight and cabin temperature goes higher at that moment before drive down all windows to cool down the cabin temperature. The blower is auto speed it fluctuates according to temperature.
I will wait for your reply.
You can call me after 13:00 @ 03318747737
Best regards
Rizwan Bunce