Why is my heater not working?

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Is the engine running at a normal operating temp? Also, when the heater is on high and the engine has warmed up, are both heater core hoses getting hot?

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Thursday, November 26th, 2020 AT 11:40 AM (Merged)

BLEVFAM15

MEMBER
1 POST
1999 NISSAN PATHFINDER
3.3L
4WD
219,000 MILES

Air blows but only cold, it does not get hot at all. We have flushed the system and coolant levels are good. The vehicle runs at normal temperature. We have no idea what the problem could be. Any ideas? The vehicle's year is 1999.5.

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Thursday, November 26th, 2020 AT 11:40 AM (Merged)

KEN L

MASTER CERTIFIED MECHANIC
47,640 POSTS

Hello,

It sounds like the temperature blend door actuator is not working which will cause the air door not to move allowing the hot air inside the car. Here is a guide to help you see what you are in for when doing the job.

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

and

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

Check out the diagrams (Below)

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

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Thursday, November 26th, 2020 AT 11:40 AM (Merged)

CRAWDAD629

MEMBER
1 POST
1991 NISSAN PATHFINDER
3.6L
6 CYL
2WD
AUTOMATIC
214,000 MILES

AC works fine but I cannot get any heat.

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Thursday, November 26th, 2020 AT 11:41 AM (Merged)

KHLOW2008

MECHANIC
41,814 POSTS

No heat could mean coolant is not getting to the heater core or the air mix vents are not working correctly. Start with a flush of the heater core to check if it is clogged.