We've actually talked about back flushing the heater core just to see if we can improve the heat situation temporarily until we can take some time to replace the radiator and heater core. I'm afraid that all that rusty crusty stuff is actually plugging some holes in the heater core and if we back flush it now, I'll have to replace the heater core now before I'm ready.
It got all the way to 31.8 degrees in the cab this morning.
Brrrrrr, man, brrrrrr.