Overheating, low fuel efficiency, fuel smell in cabin
 

No coolant leak, changed radiator, radiator cap, head gasket, spark plugs, coolant, thermostat valve, thermostat switch, timing belt, timing bearing, ac fan belt. Problem started after timing belt, timing bearing, ac fan belt changed & tappet setting done. I have checked the fan in both the ways, when in idle and when its working on the AC. As in idle, the car when becomes hot, the fan starts & on AC as soon as the AC is on the fan starts. Also throttle body cleaning, injector cleaning done.

one of the main causes of overheating, low fuel efficiency, fuel smell in cabin is a defective egr valve..check the egr valve for leaks..

Overheting and fuel smell in cabin really creates too much problem and makes sitting difficult in the cars. If it effects the AC then it becomes worse. S o it is necessary to check properly for the leakage.

I agree with Kurtdaniel, I had same problem in my 2003 Grand Vitara and changing EGR Valve did the trick.