1997 Nissan Altima heat/ac controls

1997 NISSAN ALTIMA
10,700 MILES • 2.0L • 4 CYL • FWD • AUTOMATIC
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HUBERT GOINS
  • MEMBER
  • 1 POST
heat/ac only blowing out defrost vents, no matter what I set it on. Good heat/ac but just not changing from defrost?
Mar 2, 2015 at 11:07 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
The air flow is operated by engine vacuum. Check to make sure there are no vacuum leaks between the engine and interior as well as to the vent doors it operates.

When checking under the dash, start the engine. If you are lucky, you may hear a hissing sound indicating a leak.
Mar 3, 2015 at 12:44 AM
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