If anyone out there figures way some dodge trucks heaters work perfect and some don't,will be one rich person.I'm going to stuff my radiator with mud,because before I cleaned out the cooling system,I had perfect heat.When I got the truck the antifreeze was brown and the rad was stuffed with Sask mud.....Since I cleaned it ,the heat in the cab was gone.I need better downfilled parka..Doesn't matter if the truck is diesel,gas,older or newer...Same complaint....poor heat..

 

Truck getting up to temp? Are both lines to the heater core hot?

 

Both lines are hot...Tried the switch of the heater lines did not help...Truck gets to about 80 then drops quick to 60...then back to 80 then back down.The typical gauge flucations.I still think I should plug that rad with cement...

 

Checked the blend door? Maybe your cable detached when you pulled your dash apart?

 

mopar winter front saved me also came with battery blankets

 

I had the same problem before,thats when I replaced the heater core...thinking that maybe....just maybe it would fix the problem..Nope....Got a little worse....The cable and blend door seem to be ok....I had great heat before.......Aftermarket thermostate didn't work,installed a cummins....gauge really bounchs around now...

 

I have seen this before your heater core is air locked as well as the crap left in it. Take off both heater lines and run a garden hose water through it BOTH WAYS hook it up and it should work

 

Wink and myself checked ,and he purged all air out of the system....Here is the plan....I got the old version of the thermostate....I'm going to go back and pick up the new version and see what that does...

 

when you get that other stat dave come on over i have a tick i want to try on the truck after put the stat in , never thought of it earlier

 

Thanks Wink.....I learned a few tricks today that I never knew about....Us old fellows don't know everything...

 

Is the heater door moving when you go from cold to hot? Is the heater core heating up? If the coolant lines are warm, you should have heat. Mine heater works pretty decent, once the truck is warm. I can clear the windows even on the coldest days, as long as the engine is warm.

 

Thats the weird thing Mike....All that stuff is working ok...

 

most of my tricks came for older guys , and same i have though up , but most of the good ones i got shown

 

I'm in the same boat Diesel Dave2, done the same things you have. Haven't tried flushing the heater core yet, thats next.

 

might just really be the air lock. If you've recently been in on the tstat change. the air lock stops flow through the core. you can have hot hoses and a cold core.