Nov 012010
 

2002 Nissan Altima only gets heat when car reaches 40 miles per hour.Is it my thermastat, heater core or what?

  One Response to “Heating For Nissan Altima”

  1. First thing to check is the coolant level itself. If the coolant level is low, the system will not perform correctly.

    Once the level is confirmed good, you can let the engine run for a while and check the two heater hoses at the firewall connecting to the heater core. If both hoses are luke warm, you may have a thermostat that is stuck open and should be replaced.

    If both heater hoses are HOTT! then you may just have a HOT/COLD blend door actuator failing.

    In your case the most common reason would be low on coolant or the thermostat.

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