Question about 2002 Nissan Altima

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2000 Nissan Altima temperature gauge and heater problem

Car warms up normal with temperature gauge regular position and heater works. Once, I get on the road the temperature gauge drops to cold and the heater does not work. Once I stop and park the car the RPM goes to 2000 and steadly drops to normal and the temperature gauge goes from cold to regular temperature. What seems to be the problem?

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  • mexpapi0069 Jan 29, 2009

    but is the RPM problem link to the broken thermostat?

  • Anonymous Apr 28, 2009

    I haven't tried to use the heater since noticed this problem, buy my guage is doing the exact same thing (for my 2000 Altima).

  • Anonymous Mar 16, 2014

    I have a 2013 acura tl my temperature gauge keeps dropping to cold i have to turn on heat so it could go up what can that be

  • Anonymous Mar 24, 2014

    could it be a fuse or thermostat?

  • Anonymous Mar 24, 2014

    fuse?

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I jus finished changing the thermostate. and yes it is in correctly...lol. That was the first thing I thought of.

Posted on Nov 24, 2013

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Sounds like you need to replace the thermostat.

Posted on Jan 29, 2009

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2003 chrysler town and coy try, temp gauge goes up and heater gets warm when idling, but as we drive the temp gauge goes way down and heater blows cool air. Any suggestions?


1. Engine Coolant Temperature.
If the thermostat in the cooling system is getting stuck in the open or partially open position rather than opening and closing as needed to keep the coolant at the required operating temperature then you will get the results you have described here with the coolant temp dropping as you drive. The radiator is providing optimum cooling when the car is moving and there is plenty of cold air flow through it.
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Thermostats in the cooling system do become faulty in time and it may well never have been changed (or only changed once) since the car was built and is possibly gummed up with debris. With those symptoms I would definitely change the thermostat. Make sure a full flush of the cooling system is done at the same time and refilled with fresh coolant.

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I would not worry about the interior heating until you change the thermostat on the cooling system. However if you continue to get cold air from the heater then there will be an issue with hot coolant from the cooling system being restricted in flowing through the heater core.

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It does sound like you have an airlock .. and the airlock is likely to be in the heater matrix, as opposed to the radiator.

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First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced.
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

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2005 Pontiac Montana SV6 heater blows cold when slowing to idle


How cold is it there and does your engine cool down any while going slow? If it does it may mean you need a hotter thermostat installed, My first thought would be to check the coolant level in the radiator and the coolant reservoir! Hope this helps and Merry Christmas

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