2012 Nissan 300ZX Repair Question
93000 Nissan Xterra Overheating
Could be the coolant temperature sensor or a bad thermostat-or an AC idle up solenoid not coming on to compensate the load of the compressor.
Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.
Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.
If the block and pressure test passes check the following: Thermostat,Clogged radiator,Fan clutch,Radiator electrical fan,collaspe hoses,water pump.
Hope this helps-Good Luck
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