Hey guys. i got a 10 hour drive ahead of me this weekend to go wheelin with some old friends. i got a 99 sport. my question is my cruise control doesnt work and i dont really want to hold the pedal down the whole way. now when i press cruise on. it lights up on my gauges like it will work. but when i press set to set the speed it wont engage as it should. any ideas? thanks

 

Football canister, or a vac leak somewhere.

 

Two possible causes, the first is cheap/easy and the second is expensive/time-consuming.

1.) Speed control electrical connector or mechanical linkage disconnected.
2.) Failed circuit in clock-spring (PITA).

 

90% of the time it is a vacuum problem. Does your ac switch from floor to defrost? If it doesnt it is a vacuum problem.

Cruise is handled through the PCM. The only fuse that would affect it is the brakelamp fuse (fuse 22 in the PDC).

The wheel-mounted cruise switches use a MUX variable-resistance circuit through the clockspring. The PCM reads a variable-resistance MUX from the steering wheel-mounted controls. This meant fewer wires through the clockspring.It is best read on a DRB III, which is the factory scantool. With the DRB III, you can monitor the logic-circuit in the PCM which reads the MUX.Without a DRB, the at-home owner could only read the signal by backprobing for voltage at the clockspring. The clockspring also carries the current for the airbag and horn, so most people are scared by it.

 

alright well its not fuse #22.

well my ac doesnt work.. only heat would it be the same though? ill test it if so. i also have a problem with my blower motor so on full blast theres an aweful knocking sound. but if i recall correctly it does blow on my feet as well as my windshield.. gonna go check now.

thanks for the help thus far.. can u tell im a newb to troubleshooting.. lol

 

the heat does blow through the defrost.. but not on my feet. so sounds like vacuum problem? right? how does one go about fixing this?

 

Yup, sounds like it. Check the 'Jeep Egg' behind your front bumper, passenger side. See if the hoses are connected there. If so, then trace them back through the engine compartment and figure out where they are broken/unhooked.

 

ok so i looked.. and no "egg" i have a winch bumper and i assume its relocated or just gone? idk that much about the tech side of jeeps YET.. but where is a popular place to move them too and can somebody post a pic of one. i googled it and cant seem to find a pic of what they look like. thanks

 

there is a wire hanging down in the general area that it was described as being. can it run right with none there? how many wires/ hoses/ whatnot go to it? thanks again guys

 

This one has been relocated. Usually it sits inside the front bumper on the passenger side.

 

It can run right, but you won't have cruise and you won't be able to switch your vents to defrost. One hose goes to it. It splits off in the engine compartment.

 

ok well that totally looks like the wire hanging down cept mines wrapped in conduit.. so can it work if the things just totally gone.. cause i dont see that thing anywhere in/ around the engine bay.


so a hose goes to it? and a wire? or just the hose?

as it is the only thing that works vent wise is the defrost if that helps u troubleshoot any

 

whats the hose come off of in the engine bay?.. maybe i can trace it and see if its actually gone.

got a pic.. this isnt it is it? located in front of blower motor in engine bay

 

bump

 

I've never traced mine? You could try putting a screw with some silicone on it into the end of the hose you got hanging down. Might seal it up enough to engage the vac, but then you might just end up with your vents on defrost all the time because it can't release the vacuum to switch it back. Heh. Go to a JY and pull a canister off of one.