Question about 1999 Infiniti.5 QX4

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Heater on 99 QX4 does not heat adequately

Coolant full and temp gauge in middle of range. Heater blows luke warm air at best.

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  • Anonymous Apr 08, 2009

    I have the same issue with a 2001 QX4 and the dealer is telling me my cooling system is the problem and need a new engine.



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The Heater control valve that mounted on the fire wall may be at fault some what common on Nissan vehicle. Open valve manually with the lever on top if you get heat replace vale but first chech vaccum house connected to valve for vaccum. Good Luck

Posted on Dec 12, 2008


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