My heater is not working why?

2007 NISSAN ALTIMA
143,000 MILES • 2.5L • 4 CYL • AUTOMATIC
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KITA78
  • MEMBER
  • 1 POST
I can let my car warm up, the engine says warm on dash however there is no heat blowing threw the vents. The control knob is turned all the way up and there is no heat or air. After driving for about 20 mins the heat comes on. What can this be?. Please help
Jan 4, 2016 at 5:04 PM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
check to make sure both hoses going to heater are hot then try unplugging hvac fuse for 60 seconds with key on it may reset the air mix motor as that may be the problem so no heat.it's fuse 3 and 6 in car this is for manual heat only. This sounds like you have low engine coolant or the temperature blend door actuator stopped working but to but sure this video and guide can help us fix it.

https://youtu.be/SNRb6pSwYuU

and if the temperature blend door needs replacement here is a guide that can help with diagrams below to show you on your car.

https://www.2carpros.com/articles/replace-blend-door-motor

This guide can help as well

https://www.2carpros.com/articles/car-heater-not-working

Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.
May 24, 2021 at 7:27 PM
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