Question about 1997 Nissan.5 Altima

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A/c vent issue

1997 Altima SE...a/c was serviced last summer. very cold. Now when air flow is set to center (dash) vents, it appears to be randomly blowing warmer air, perhaps mixed vent (fresh) air. Works fine when set to lower (floor) vents. W/ fan OFF, there seems to be abnormal air flow thru vents as well

If I am getting outside air into the system (heater box) it appears ONLY when sdash ducts are open....if this is possible, what is fix short of dropping box from under dash

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Heater blowing cold when engine idleing,works good when rpm are up. what is problem? pete

Posted on Oct 24, 2008

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Posted on Jan 02, 2017

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I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
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Are ALL HVAC fan speeds operational when requested ??
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