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Answered 2008-09-10 11:43:43

Only thing common to both is VACUUM. Look for a unattached , broken line, ALSO need to check that the one-way valve is working, this is in conjunction with the vacuum canister. The vacuum canister holds a constant vacuum, so heater doors wont be switching under acceleration. BUT the Cruise control should use a manifold vacuum so can adjust throttle. Both could be off on bigger line the split to each.

Hope this helps, I had the exact same problem with my 2001 Grand Cherokee, ((fan position switch won't work (go from floor to dash to windshield, etc.)), and the cruise control won't engage. I'm told both are due to a vacuum line problem, ). I fixed mine by replacing 1/4" hose located directly under battery mounting pan. Takes a little work but might be worth it. First remove battery. Then remove pan, you'll need a deep socket 10mm with extentions to get at one mounting nut. Remove two nuts holding cable to fuse/relay box attached to pan. Move pan out of way. The hose that's causing all the problems is about 6" long going to servo. Replaced hose ($.77) and it took care of both problems. Total job took about 1 hour. From what I have been reading this is the hose that's causing everyone problems.

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