The heater works, first of all. The air blows out hot, but when I come to a stop, the air blows cold. This isn't a huge problem really, especially since we only have 10 cold days a year in Tampa, but still annoying nonetheless. Usually, if the thermostat is stuck open, you get LESS heat while driving than while stationary, due to more cold air being forced through the radiator while driving. If the thermostat is stuck closed, the engine overheats. Your problem sounds more like low coolant level - i.e., the water pump is moving a lot of air mixed with the coolant. It's made to stop hot coolant from going to the heater core if a/c is on. they like to fail. feel the hoses on either side of it and if one's hot and one's cold then it may be malfunctioning. If the hoses are different temp then unplug it and check voltage at the plug it should go 12 volts one way when turned to cold and 12 volts the other way when turned to hot.
Nissan Frontier owners have reported 108 problems related to transmission failure (under the power train category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Nissan Frontier based on all problems reported for the Frontier.
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