My 2006 nissan xterra is having over heat what is the cause
to many things could be the cause,this is not some thing that can be answered with out having a lot more information,could be anything from the electric fan relay bad,to a hole in the radiator,water pump out,head gasket blown,cracked head,cracked cylinder liner,too low on coolant,but a real common one in a cracked over flow tank,or no over flow tank,while your motor is running the temp will get higher while not moving,the radiator will build pressure above the the max cap pressure,and the over flow hose will deliver coolant to the over flow tank,then as the motor cools and the radiator pressure drops,then the thermostate will open and the radiator will suck the coolant back into the radiator,this will continue all day as you drive,but without an over flow tank to force coolant into,it will force it out and it will go on the ground,the when the time comes to return the coolant to the radiator,so the radiator don\'t have coolant so it will take air back into the radiator,and in no time the coolant system will be out of coolant,this is common,or there is no coolant fan,or when using the AC the electric fan isn\'t coming on,or the fan is missing the shroud,there are endless possibilitys
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