Okay so I have a 2000 ram 1500 with the 5.9 360.
what I know so far is my heater core is plugged up, but when I turn on the blower, it throws a code for a throttle position sensor, and overdrive stops working as well, Witch confused me to no end, I'd like to fix everything but I have no idea where to start. If someone could give me some advice that would be awesome. Thanks.

 

Now there is a strange interaction...... You can download a factory service manual for your truck from here. Wiring diagrams are in section 8W. Trouble is, there shouldn't be ANY commonality between the heater blower, and the TPS....... (TPS is on the 5 volt circuit, which is provided by the PCM......)

Think I might start by seeing what the 5 volt wire does when you turn on the blower.....

 

I was thinking maybe a bad ground on the blower motor itself, and maybe it was grounding out somewhere else .

 

Blower switch on your HVAC controls determines which part of the circuit gets ground. That's how it control blower speed.