1997 Nissan Altima heat/AC controls

Tiny
HUBERT GOINS
  • MEMBER
  • 1997 NISSAN ALTIMA
  • 2.0L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 10,700 MILES
Heat/ac only blowing out defrost vents, no matter what I set it on. Good heat/ac but just not changing from defrost?
Tuesday, March 3rd, 2015 AT 7:07 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 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.
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Tuesday, March 3rd, 2015 AT 8:44 AM

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