dear members asalamoalikum
i am using mehran since 4 years. so from my experience i m sharing some knowlede with u.
1)mehran heating problem with AC
coolant do a very little change . the only change is kabli radiator.but its own one is also better
u should not keep the AC button at full because then it will not trip at right time.keep one less then full
use curtains for sun heat.
make window shower to put water on radiator for overheat problem as shown in image.
2)rear suspension problem
as mehran shock absorbers are very weak ones. so change it with coure ones u can get as kabli ones.
but it fits with little alteration. car will be very soft from the rear.as shown
3) brake problem
simply change it with servo. 4000 rupees kabli.as shown
4) sweat with seats in summer
simply use wooden patched cover seats for that.as shown
get ur cng mixture tuned and change ur battery after 12 to 15 months
using these tips u will not hate mehran but u will change ur mind.