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My heat works on and off

Tiny
GR8T4EVER
  • MEMBER
  • 2003 NISSAN ALTIMA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 85,000 MILES
My heat works on and off. It'll blow hot air for awhile and then turn ice cold as if the air conditioning is on, what is the cause of this? The mechanic told me I need a new water pump but I don't see any coolant leaking or have any engine overheating issues.
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Thursday, October 21st, 2010 AT 2:34 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

This sounds like you have a temperature blend door actuator that is out. Here is a guide that will give you an idea of what you are in for when changing the actuator out.

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

This guide can help as well.

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

Here is the locations of the temperature blend door actuator for your car. (below)

Please let us know what happens.

Cheers, Ken
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Monday, May 24th, 2021 AT 7:39 PM

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