If the system has a full charge then the thermister is most likely the cause for it not working.
A bad thermostat can cause overheating in a Nissan Frontier when the air conditioning is turned on. A bad compressor can also cause this.
A Nissan Frontier may be overheating because the radiator is cracked. A thermostat failure can also cause it to overheat.
A bad transmission gear can cause your 1999 Nissan frontier to shift hard. Low transmission fluid can also cause the transmission to shift hard.
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The most probable cause is that the clutch is either not releasing; master/slave cylinder not working, or the clutch itself is damaged.
A wire is shorting to ground.
Trouble code P0744 means:Torque converter clutch circuit intermittent
Water in engine-head gasket most likely.
check your brake fluid levels
Fuel tank Fuel line Fitting on fuel filter
try the neutral safety switch