I've searched around and not really found any other threads with my problem. At least not any that had solutions.

1. My cruise light comes on when I turn it on
2. Cruise does not engage and the other three buttons do nothing.

Anyone else has this problem or know how to solve?

 

Firstly, how about supplying us with the year, model, engine size of your D so we can help you better?

 

in the sig.... that doesn't seem to show up

2001 - 4.7

 

First i would the vacuum source,at the intake manifold. Are there any other problems, like air bag lite on,door locks not locking at 18 mph or no overdrive?

 

nope. no other lights or problems. cruise and AC aren't working but i can only imagine they are not related. everything else is great.

 

Cruise and ac are both connected in one way. Vacuum controls the blend door and mode door in your HVAC system. If you lose vacuum to your HVAC system it will default to heat and defrost.

 

sorry mean green, but he has an 01, those doors are mechanically actuated, so im still lost on the link

 

Are they mechanical on the later models D's? Mines vacuum controlled for the recirc and mode door. IIRC the blend door is mechanical on mine still. Hmmmm I was tired last night.

 

yea the later half of the gen (not sure if it start 00 or 01) are mechanically actuated by electronic motors, you are forgiven . . . this time

 

There are 2 things to look into:

1. A bad TPS but that usually includes surging of the motor in about 300 rpm when cruising down the hwy.

2. A bad brake switch above the brake petal.