While initial starting smell from exhaust is very bad and also takes around 1 min for rpm to get low

The AC of my car doesn't work and the fan keeps running loudly. I gave it for service at the authorized service station and the mechanic said that the AC heater core is damaged. The thin aluminum box… 

back gear always stuck , not have proper

Ac not cooling not properly working

Bad smell is there if on the ac or not

AC not the proper cooling. Very less cooling issue