[Canuk1]

Sorry for the late response but I am trouble shooting the same issue, no floor heat. If you still have your Nitro, the upper actuator located above & to the right above the gas pedal controls the Defrost, Vents and Floor and a blend of all in between. Our 2011 Nitro has Defrost and Vent function but no floor heat. Upon removing the actuators both of which are secured to a mounting plate, I discovered that the gear on the left side of the heater housing that is driven by the upper actuator has broken teeth and the actuator cannot move it through the cycle to divert hear/cooling to the floor. To replace the broken gear, the entire dash, steering wheel & console must be removed as well as the heater box, a very time consuming and involved process. Check out the attached YOUTUBE video which illustrates this. We also have a 2008 Nitro that has the exact same issue. It appears this is a common problem with the Nitro and Jeep products with the same heater assembly. I have attached a photo of the damaged gear which extends through the heater housing and is driving by the actuator. There is also a very good Hilltown YOUTUBE video which also illustrates the broken gear. Hope you find this information beneficial,

 

[rickaren]

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[rickaren]

Dodge Nitro chemical heater core flush.

Oct 23, 2021

 

[rickaren]

ATTENTION! 3 UPDATES: How to change a heater core - PART 2 (Jeep Liberty/ Dodge Nitro)

Jan 7, 2022

3 IMPORTANT UPDATES to the previous Video: Step by step instructions on how to remove a heater core. Timestamps: 00:00 Intro 00:21 Jeep Heating Problems 00:53 1st question: Dash Stuck 03:22 2nd question: Recovering Freon 06:33 3rd question: Poor Air Flow 09:07 Test After Repair 09:36 Conclusion

 

[dennisthornhill49]

Just did a heater core flush in my 07 nitro 3.7 that was blowing ice cold air now hot heat didn't cost anything and was easy and quick two three foot pieces of garden hose and water and air flushed out one way then the other four times then filled the heater core back up with antifreeze out hoses back on got heat didn't drain nothing very minimal fluid loss

 

[rickaren]

Thanks for the Update.

 

[dennisthornhill49]

I would do a heater core flush first before I would take it somewhere and get rang up. If it ain't steaming the windows up or leaking in the floor board nine out of ten times it's the core clogged up easy fix and cost nothing mine is still blowing good heat