MCI 9 Drivers OTR Heat

[MC8Mike]

That's part of my hair brained scheme. Add a radiator in the spare tire compartment. Force feed air from the front of the bus through intake grates, through the radiator and then down under the the bus. Use the existing OTR main heater water control valve to enable supplemetal cooling without additional electric fan loading.
Kenny

I did something similar on my 8, I mounted a GM 4 row radiator in the original condenser compartment along with a A/C condenser for the dash air. Used tandem electric fans to draw the air in through the side screen and exited out the bottom of the bus. I used gate valves to control the flow from the main engine and plumbed my gen set into the same radiator. I also plumbed in a heater core for the living area just above the condenser compartment.

[Kenny]

I be warm now. Who cares about the ones in the back of the bus. Drivers OTR heat now works fine after removing the OTR main heater. Had to bleed the air out of the drivers heater core to get water flow back. Now going to extend the original OTR main heater core copper lines to the spare tire compartment, add a radiator, some air intake grates in the front of the bus and walla I think I'll have some backup engine cooling without power robbing fans, just 70 mph headwinds. The secret will be to disguise the air intakes so it doesn't look like a motor home. 

[buswarrior]

re: tom's MC9 tying the big heater core lines together...

That creates a feedback loop of sorts, the hot coolant is introduced back into the cold side with little to none of the heat removed.

It's all in WHERE you cut the pipes, whether you maintain the run-through to the defroster, or end up cutting the whole thing off.

happy coaching!
buswarrior