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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  • Master
  • 740 Answers

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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Posted on Jan 02, 2017

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Heater temp on high only bows luke warm air after driving. A/C works just fine.Plenty of cold air from it


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I have a 2003 chevy impala. Just recently come acrossed in issue where the heater blows nothing but cold air even with the temp gauge going as high as it can get. Weather its at an idle or being driven....


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and your temp gauge is normal in the middle then most likely u have a bad blend door actuator usually on the passenger side

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