Amalik

Sure you can, just go under the car and open the radiator drain plug under the car and let all water come out and then refill.

door that isnt working check the lock inside must be dead, ageing issue and easy to change. Buy new and replace the lock.

Check the fuse or some wire that connects these both. Follow the diagram and check wires for conitunity with the multi meter.

Soak bolts in wd40 for 5 mins and it shud come out easy. Brake drum get changed after long time than the tyre or brake pad, so it bound to get hard when not been used for long. Just try harder.

get your tyre wheel balancing and alignment done, it will be fine. It tyre guy suggest changing a tyre listen to them as you have already put 75k on these tyre, much more than suggested.

Buy new headlight and and open the rear clamp on screw of headlight, you need to open few flaps and panel on backside of headlight, use your common sense and its easy DIY job. Max 15 mins.

Go get second opinion, timing belt never dies and result in leaking. It has slipping and starting issue and if its already bad your car wont start. Mechanic need some work so he is changing timing belt, most expensive maintenance in whole car. All it cud be engine oil sump seal is gone and he is showing you different story.

Main fan, Ac fan, radiator clogged or leaking, not enuf coolant, thermostat faulty. thats all i can think of.

Check cruise control wire and see if its little rough or too tight. Put some generous amount of WD40 on cable and cable cover and i hope it wont disengage.

Trace the leak, more likely it may be from hose or from elbow from steering pump (not pump). Change that to original part and it will fix permanently this issue. Good luck.

Cooper and yokohama are best for wadi and occasional sand offroading. Actually BF goodrich is best but fortuner will get more slow with such beafy tires.

If its only then smoke, it cud be air intake, manifold or exhaust issue (simple and cheaper) If its smoke and loss of power than before, i doubt it could behead gasket need a change (complicated, messy and expensive job).