Heater not producing hot air

DMORGAN757

MEMBER
2010 NISSAN TITAN
5.7L
V8
4WD
AUTOMATIC
76,000 MILES

All systems work, A/C, defrost, main vents, floor vents. Problem is, no heat. I have checked the function of all engine bay heating components and fluids and they are functioning. Any ideas?

Tuesday, November 13th, 2018 AT 3:36 AM

7 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

Just two quick questions first. Is there any coolant/water leaking on the passenger floorboard? Also, does there feel to be sufficient air flow coming from the vents? Get back to me and I will help diagnose. Hope this helps and thanks for using 2CarPros.
Danny-

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Tuesday, November 13th, 2018 AT 4:36 AM

DMORGAN757

MEMBER
4 POSTS

No fluids on floorboard and yes, excellent airflow.

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Tuesday, November 13th, 2018 AT 6:05 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hello,

If both heater hoses are hot it sounds like you have a mode blend door actuator that is going out. Here is a guide that will walk you through the steps and the location of the blend door actuator for your car below:

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

Cheers, Ken

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Thursday, November 15th, 2018 AT 5:53 PM

DMORGAN757

MEMBER
4 POSTS

I just wanted to add to this post. I took my truck to my local Nissan dealership and paid the $128.00 diagnostic fee. They told me it was the heater control valve. I have already checked it is operation and it was functioning. They were asking for over $500.00 to fix a part that was already working. Smh.

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Saturday, November 17th, 2018 AT 12:18 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Are both heater hoses hot going into and coming out of the heater core? It could be an air pocket caught in the core you might need to jack the rear of the truck up? Did you see the guide?