[Richardp65]

Engine temp runs normal, but no cabin heat.
I've replaced thermostat.

Bozeman, Montana here and frigid.

 

[Don Fox]

Hi RIchard:
What engine is in your Durango, and have you checked the coolant level? It can have enough to keep the engine cool in moderate temps, but not enough to circulate through the core(s) to provide heat.

Don

 

[Tin Foil Hat]

Did anyone bypass the heater core or have you always owned it?

 

[Richardp65]

Hi RIchard:
What engine is in your Durango, and have you checked the coolant level? It can have enough to keep the engine cool in moderate temps, but not enough to circulate through the core(s) to provide heat.

Don

5,7l. I think the coolant reservoir is cracked or broken, I have to fill the radiator about once a month.

 

[Richardp65]

Did anyone bypass the heater core or have you always owned it?

The heat actually works when it's idling, but blows absolutely cold when it gets above 35mph.

 

[Richardp65]

The heat actually works when it's idling, but blows absolutely cold when it gets above 35mph.

I bought it last December.

 

[Don Fox]

Ok on the 5.7:
Does it have the rear HVAC also? Do you see any puddles or smell coolant on a daily basis? Did you purge the air from the system properly after the nww T stat went in? If not, you probably have air in there.
The bigger issue though is the leakage. You'll want to find that asap.

Don