No heat, digital controlled comfort system?

JUSTSAM01

MEMBER
2000 NISSAN PATHFINDER
3.2L
V6
2WD
AUTOMATIC
200,000 MILES

My vehicle has a digital controlled comfort system. The A/C will run you out of the vehicle, but the heat does not get hot. What controls the HVAC system to get some warm air in the cabin?

Monday, October 21st, 2024 AT 2:51 AM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

That would be the air mix blend door actuator which might bad, but I need to ask if the heater hoses are getting hot? You might be low on coolant, or you have a clogged heater core that needs to be flushed. Please go over this video for help:

https://www.youtube.com/watch?v=SNRb6pSwYuU&t=1s

Here is the location of the air mix actuator so you can check it out. Check out the images (below). Please let us know what happens.

Image (Click to make bigger)

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Monday, October 21st, 2024 AT 9:59 AM

JUSTSAM01

MEMBER
3 POSTS

The heater core hoses are not getting hot. They run to some contraption behind the engine block, itself. I'm thinking that may be a heater control valve that is stuck shut. Possibly not allowing hot water to flow through the core. Only problem is my 6' 2" frame can't get back there to investigate.

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Monday, October 21st, 2024 AT 1:03 PM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hmm they don't show a heater control valve, did you check the engine coolant level, engine cold)? Can you upload an image of what you are seeing?

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Tuesday, October 22nd, 2024 AT 10:14 AM

JUSTSAM01

MEMBER
3 POSTS

I can later when I get off work. Coolant level is good, though. The blower fan works good. All air vent settings work (floor, bi-level, front, and defrost vents change like they're supposed to) Not sure if the blend door is functioning, or not.

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Tuesday, October 22nd, 2024 AT 11:05 AM

KEN L