2001 QX4 Heat & AC Temperature Problem

A forum for the legendary Nissan Pathfinder and Infiniti QX4.
QX4zBeach
Posts: 4
Joined: Fri Jun 01, 2012 4:58 pm
Car: 2001 QX4

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Love my truck! Getting ready to hit 200,000 with pretty much only maintenance and minor normal wear and tear repairs.

But have a new problem and wanted to see if anyone has had the same and knows how to fix.

I have the climate control on the Navigation panel. May be relevant, maybe not. All the controls work and the fan blows fine. Problem is heat will not stay hot and AC will not stay cold. Sometimes it works right, sometimes it doesn't. Last summer AC was recharged and ran perfect. AC is not nearly as cold now either. My mechanic, who really has not had a chance to look at it yet noticed when he was fixing something else the vents are not opening and closing right. Could this be the air mix door motor, blend door actuator motor, fan amp, cabin sensor, etc....? The fan also started making a clicking noise now.

Off the cuff, my mechanic thought it may be a problem in the Navi / climate control panel not telling the doors to open / close correctly. I'm not sure about that. I would think it more a mechanical / motor issue after the command has been sent. Doubting everything else works in the panel right but that it can't send just these commands correctly. Any opinions?

Please excuse me if I have not said things quite right. I am not a mechanic or even close. This is why I am asking you all. Thanks bunches. Yep, I'm a girl :)


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Towncivilian
Posts: 4868
Joined: Sun May 23, 2010 10:21 am
Car: 2001.5 Nissan Pathfinder SE 3.5L 2WD A/T
2007 Nissan Altima 2.5L CVT
2012 Nissan Sentra 2.0L CVT Special
2012 Infiniti G37 Sedan 7A/T
Location: Florida, USA
Contact:

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Welcome to NICO!

There is a diagnostic procedure described on page HA-55 of the factory service manual. Try to follow it and tell us if it gives any useful results.

QX4zBeach
Posts: 4
Joined: Fri Jun 01, 2012 4:58 pm
Car: 2001 QX4

Post

Thank you so much! I will read this, try it, and post results :)

QX4zBeach
Posts: 4
Joined: Fri Jun 01, 2012 4:58 pm
Car: 2001 QX4

Post

I ran the diagnostics from the Navi and everything passed. Any idea what to look at next? Thanks again.

User avatar
Towncivilian
Posts: 4868
Joined: Sun May 23, 2010 10:21 am
Car: 2001.5 Nissan Pathfinder SE 3.5L 2WD A/T
2007 Nissan Altima 2.5L CVT
2012 Nissan Sentra 2.0L CVT Special
2012 Infiniti G37 Sedan 7A/T
Location: Florida, USA
Contact:

Post

Strange that it passed, unless the issue is intermittent. If some door mixer is not opening correctly somewhere, it would probably be detected by the diagnostics. See this thread - do you get these same symptoms?


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