Heater blows cold air out the vents

SHANNON WISEMAN

MEMBER
2010 NISSAN TITAN
5.6L
V8
4WD
AUTOMATIC
125,000 MILES

The heater core heats as it should both pipes are hot. I have changed the blend door on the heater box. I have checked the water in radiator and in overflow all look good. I have changed the blower motor resistor. But I still have no heat everything appears to be working as is should control panel turns it up an down an on an off. We are puzzled what could be wrong with it that I'm missing. Any suggestions?

6 Replies

JACOBANDNICKOLAS

MECHANIC
108,300 POSTS

Hi,

Are you referring to the mid level vents or does it blow cold air regardless of air flow directions? Also, I attached a picture the blend air door actuator below. Let me know if that is what you replaced.

Joe

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Tuesday, November 26th, 2019 AT 6:52 PM

SHANNON WISEMAN

MEMBER
4 POSTS

Yeah that's the one I have replaced cold air comes out all vents even switching from defrost or floor no matter which one u choose it will still blow out cold

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Tuesday, November 26th, 2019 AT 7:06 PM

SHANNON WISEMAN

MEMBER
4 POSTS

Could the flapp door be stuck closed if so what is the easiest way to get to it or is there one

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Tuesday, November 26th, 2019 AT 7:09 PM

JACOBANDNICKOLAS

MECHANIC
108,300 POSTS

Hi,

Yes, it could be stuck. What I suggest is to remove the actuator and see if you can turn the flap by hand. If it doesn't move, then you will most likely need to remove the heater box.

Let me know if I can help.

Take care,
Joe

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Wednesday, November 27th, 2019 AT 7:45 PM

SHANNON WISEMAN