Nissan Repair: continous overheating nissan frontier pickup truck, nissan frontier, frontier pickup

Question
my Nissan frontier pickup truck overheats whilst driving and in idle mode. No radiator leakage, fan seems to be working perfectly. temperature gage is always in dangerous zone. please advise.

Answer
hello i would think the most likely cause of this would be an air lock in the system as it wont allow the air to circulate and this would cause the temperature sensor to read a high reading if you get a hose and try to connect it to the highest pipe on the rad it will usually work its way out failing this you would have to bleed the system to allow the air lock to be removed from the system