Temp gauge & AC stop working and sometimes the oil gauge drops to zero.

it will have to be scanned for codes to see if it's a control problem in hvac or an a/c problem like freezing system up due to moisture in system. you may have a dash going bad or a body module causing the problem for the gauges.

Thanks dear for your replying,

I do not think the problem is in the HVAC system, the AC stop working because the temperature drops to zero and as you know when the temperature of car is zero (cold engine) the AC does not work. so the problem of AC is clear that because the temperature become zero.
so my problem is why the temperature gauge drop to zero, and sometimes also the oil gauge, and after i reset the system by removing the cable of battery, the problem disappear and come back after driving for a few time...

do what I said in first reply it needs to be scanned for codes. if the tech reset it then there was a code that he never told you or you decided not to fix

Okay dear, I will do it today and will inform you what will happens.

Thanks a lot

Hello,

I did the scan as you advised me, he found that the ECT sensor (energi coolant temperature sensor) should to change, i changed and next day the problem came back. :(

what now??!!!

then you either have a short in the wiring or the cluster is bad and needs to be rebuilt.

i changed the thermostat and till now it is okay, i wish the problem has solved.
i will inform you for any news.

Thanks