# HVAC stops blowing

**URL:** <https://community.cartalk.com/t/hvac-stops-blowing/84026>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, altima\
**Created:** [March 3, 2014, 10:53am UTC](https://community.cartalk.com/t/hvac-stops-blowing/84026 "2014-03-03T10:53:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Collier20](https://avatars.discourse-cdn.com/v4/letter/c/90db22/32.png) [@Collier20](https://community.cartalk.com/u/Collier20)\
**Post date:** [March 3, 2014, 10:53am UTC](https://community.cartalk.com/t/hvac-stops-blowing/84026/1 "2014-03-03T10:53:15Z")

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I drive a 2000 Nissan Altima and when I am driving for long periods of time (over 30 minutes) the HVAC stops blowing. You can still hear it working (in fact it sounds louder) but only a small fraction of the air makes it out of the vent. This effects floor, defrost, and dashboard vents evenly and A/C and heat. I think it must be a value that is failing. Oh, and the problem seems to correct itself if the car is off for more than an hour, but stopping for gas doesn’t correct anything.