When I driving my Honda Civic 160i in high speed my car sometimes overheats, the other day I was doing 140km/h and the gauge just raised. Can you tel me what might be wrong with it because I have a new radiator and I just changed my cam belt.

I would have it tested with a gas meter to see if the head gasket is leaking, I bet it is.

Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

Wiring Diagrams related to the Honda Civic
http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

Motor engine cooling fan only runs as engine temperature requires additional cooling.

reset immobiliser I HAVE A HONDA CIVIC 1.6 LUXLINE ...

www.fixya.com/cars/t23058317-reset_immobiliser
Jan 22, 2014 - reset immobiliser I HAVE A HONDA CIVIC 1.6 LUXLINE 1998. I NEED TO BYPASS THE IMMOBILSER TO START THE CAR WITHOUT IT ... Press any button on remote one time within 20 seconds. .... How can i fix my honda 160i luxline92 model starting difficulty? Jul 20 ... Jun 09, 2012 ' 1996 Honda Civic.

Maybe your cooling fan is broken. I had the same problem with a honda civic. It would overheat at idle or low speed, but at high speed the air forced through the cooler would keep the temp down. I don't know why it broke, but I just wired the fan to a circuit that came on when the car started. I used a multimeter to check the voltage of various wires in the engine compartment until I found one that was off when the car was off and on when the car was on.

Change the thermostat? Probably did, since you went after the computer. Does the car really over heat? Or does the gauge just go high(bad gauge). If the engine does over heat, then it could be the water pump, or to much sediment in the engine(Something blocked). I have seen both.

For car running hot and overheating issues,i suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems :----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

There is 2 harnesses near the bottom of the steering column that you should check. Also change the block fuses in fuse box.

Try the antifreeze and if it does not work still it could be the radiator needs fixing.

yes, this is the case of a failed throttle body, in which case it needs replaced, the car is getting too much fuel causing the high idle. this needs replaced asap. you could proably find a small independant honda shop that could do the work for less.