Cruise Control Won't Work

[Wooleycr]

Ive just installed factory cruise control on my 05 TJ 4.0 SE. Switches work, lights come on, I got a servo off of an 04 tj engine at a yard. The vacuum lines are connected as well as the plug. I cleaned the plug out best I could with qtips.
Cruise wont work. Basic question: When the engine is running, if I removed a vacuum line, would I feel something at the exposed end if it was working? Because I don't feel anything. Everything else air related works fine though. I also have the resevoir, if thats what the little black box below the battery is.
What do I do before taking it to a shop?

 

[TJ4Jim]

Ive just installed factory cruise control on my 05 TJ 4.0 SE. Switches work, lights come on, I got a servo off of an 04 tj engine at a yard. The vacuum lines are connected as well as the plug. I cleaned the plug out best I could with qtips.
Cruise wont work. Basic question: When the engine is running, if I removed a vacuum line, would I feel something at the exposed end if it was working? Because I don't feel anything. Everything else air related works fine though. I also have the resevoir, if thats what the little black box below the battery is.
What do I do before taking it to a shop?

Welcome to the forum, and yes there should be some sense of vacuum at the hose. Wet your finger tip and see if it tries to stick. Are you having any issues with the direction of airflow on the defrost/dash air vents which would indicate a vacuum leak.

 

[superspook]

i found that the cruise control on my 04 does not work unless going over 35mph or so. I am new to this jeep so mine might be broken as well.

 

[glowell222]

Also, just because the green dash light illuminates, don't assume that means your switch is is good. The lower "set" contacts may be corroded or the switch may be cracked. I would check the switch as well.

 

[Longhorn84]

Just to confirm, you have ac blowing out of vents and not defroster? Happens when vacuum isn’t sufficient.