Climate Control Problems (Air Conditioning, Heat) - All Cars - Car Forums

1. Are the HVAC fans working (blowing air) when heat is called for?
2. Is the engine coolant up to temperature?

Sounds like it may be the valve that lets heated coolant flow into the heater core. If so, that could be the valve itself, or the signal that controls it.

#828 of 831 air condition by johnwatson85

Dec 30, 2011 (2:09 am)

hey that was really helpful and i would like you to visit www(dot)equilibriumac(dot)com

#829 of 831 ac/ heater problems by itsnizzle

Feb 29, 2012 (9:53 pm)

I HAVE A 99 INFINITY QX4 AND WHEN I TURN ON MY AC/HEAT IT COMES ON BUT DOESN'T BLOW. I FIND THAT WHEN I DRIVE AT A CONSTANT SPEED (I.E. ON THE HIGHWAY) IT BLOWS OUT AIR/HEAT BUT I HAVE NO CONTROL OVER HOW HARD IT BLOWS OUT, ONLY CONTROL OVER TEMPERATURE... WHAT COULD SOME POSSIBLE ISSUES BE?

Replies to this message:

burdawg (Mar 01, 2012 1:57 pm)

#830 of 831 Re: ac/ heater problems [itsnizzle] by burdawg

Mar 01, 2012 (1:57 pm)

Replying to: itsnizzle (Feb 29, 2012 9:53 pm)

The blower fan isn't working. Check the fuse first. If it's not that, then see if the blower is getting voltage when it's on (voltage varies with blower speed). If the voltage is present at the blower connector, then the blower fan is probably bad. If it's not then it could be the control itself (manual or auto if there's climate control).
What your feeling now is just the air that flows through when your moving forward.

#831 of 831 bilk1 by bilk1

Aug 27, 2012 (12:15 pm)

I have 2003 Infiniti G35. A/c works sometimes and then goes off.Comes back on several days later. Same with heater. You can feel cold/heat but the blower won"t work.

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