Cruise control not working?

Actually no, those problems do NOT indicate bad computer.

Broken clock spring under the steering wheel. It's a wound-up ribbon cable with circuits for all three systems you listed, and it's common for all three to fail at the same time.

Hi fititmr. Haven't seen you in a while.

Does the horn work? If not, suspect a broken clock spring under the steering wheel. That's the most common cause of an inoperative cruise control. The clock spring is a wound-up ribbon cable that also has circuits for the horn and air bag. Eventually the "air bag" light will come on too when the ribbon cable breaks completely.

Also try holding the brake pedal up with your toes while driving. There's a circuit in the brake light switch for the cruise control, but as I recall, if the switch is out of adjustment, the cruise light should still turn, it just won't set a speed.

Good observation about the light. Wish more people noticed such clues.

Caradiodoc

Its called a clock spring very common and they had it recalled under certain conditions
need your VIN # and correct mileage
call your local dodge dealer it will take few minutes to verify if yours covered or not

There is no fuse or relay controlling this function. Most of the time, it will be either the brake switch is faulty or the cruise control servo (vacuum operated) is malfunction or leaking vacuum.

If the green light on the dash doesn't turn on, suspect the clock spring. That's a wound up ribbon cable under the steering wheel. As it continues to break, eventually the horn will stop working too, and the air bag light will turn on.

Not especially hard to replace but you'll need a steering wheel puller. Before you spend money on parts, it's a good idea to be sure it's what you need. Find a mechanic with a scanner that can access the air bag computer to read the fault code(s). If the clock spring is defective, the fault code will be something to the effect of "Open Squib Circuit", or "open initiator". If that's what shows up, I can describe the replacement procedure but you'll need the new part first. Some have a long cable that has to be fished down the steering column. Some have a connector up on top.

It's not a fuse for sure and next to go is the horn
Very common and almost 100% sure its clock spring
It was so common that they had a recall on it
Best way to make sure and verify check for airbag codes

CLOCKSPRING
Clockspring connects air bag module to steering column wiring, completing SRS circuit. Inside clockspring is a flat, ribbon-like tape of conductive material, which winds and unwinds with steering wheel movement. Clockspring is most fragile part of air bag system. Clockspring must be centered properly to allow 2 1/2 steering wheel turns in either direction. Failure to align clockspring properly may cause binding or premature clockspring failure

Set steering wheel and front wheels in straight ahead position.
Disable air bag system.
Clockspring is located behind steering wheel.
Remove air bag module and steering wheel
Disconnect horn connector.
Remove cruise control switch and connector (if equipped).
Remove upper and lower steering column shrouds to gain access to clockspring wiring.
Remove multi-function switch.
Disconnect 2-way and 4-way connectors between clockspring and instrument panel wiring harness.
Remove clockspring by releasing 2 tabs on side of clockspring.
Clockspring cannot be repaired and must be replaced if faulty.
Installation
Snap clockspring onto steering column.
If clockspring centering adjustment is disturbed, adjust clockspring.
Connect clockspring wiring connectors. Install steering column covers.
Install steering wheel.
Ensure flats on steering wheel hub fit formations on inside of clockspring.
Pull horn wire through small upper hole and clockspring and cruise control wires (if equipped) through larger bottom hole in steering wheel.
Connect horn and cruise control wires (if equipped).
Connect clockspring wire to air bag module.
To ensure complete connector connection, latching arms must be visible on top of connector housing.

With the heater on and the engine running at operating temp, do both heater core hoses get hot?

Not a problem. If you look along the firewall of the engine compartment, you will see where two rubber heater core hoses (aprox 1" OD) attach on the firewall. They are attached to the heater core. If the core is plugged, only one of the hoses will be hot and the other warm. Let me know what you find and don't be afraid to ask questions. That is why we are here.