bro I checked the car according to your instructions. Car was converted to petrol, cold started after 1 sec. sulf with the radiator cap opened. during sulf, half cup of water dipped off from radiator and bubbles start as mentioned earlier. I checked both radiator pipes before and after starting the car and all were preseed normally. 1 thing I noticed that radiator water level dropped to some extend and then rises up when I accelerated the race and released. during car was cold, i converted it to cng and it start missing and i had to place the foot on race padal to control the shutoff of engine but after converting to petrol it seems fine. when car heats up to the 1st dot and fan started working, i again converted it to cng and at this time behaviour is different. missing is only 20% but it seemed that cng is blocked and not going into the engine and responce time of race and acceleration is differnet as car is under heavy load.
I have no clue whats the issue going on coz i haven't tried to change the gas settings and it was working fine b4 engine overheat. please advice.