I drive alto 2002 on CNG and most of the time its city driving. I drove aproxx. 100 kilometers here and there with my engine and A/C had been running continuously for a few hours even when my car was stationary. Suddenly the car started to over heat and temperature gauge was well above the center position. However, A/C and radiator fan were working fine. Soon my engine started to smell. I figured I could make it up to home but then my car stalled in 1st gear without me being at any fault and then I could not get the engine started. Its been 1 hour since this problem, engine still smells, radiator fan is working overtime on switch mode, and I still cant get my car started. Why is the temperature not dropping?