Since the I've had the car ('98 Stratus, 180,000+ miles now) the cruise control has intermittent failures. The ways it happens are: 1. After start driving, turn the CC on, the CC light comes on. Pressing the set speed button makes the light come off. Can't be turned on again unless I shut and restart the engine. Usually works fine after the restart. 2. Having driven a long time, with CC working fine, come into city traffic, have to brake/accelerate. After passing through the city traffic, want to resume cruise, pressing the resume button shuts the CC off, as above. Again restarting engine makes it work fine. These effects are more pronounced in warm weather; in the winter it happens very rarely; in the summer - almost daily. Something else - after each "major surgery" on the engine, the effect disappears completely for 3-4 months. After changing the head gasket, the rear main seal and the cat converter (each on a separate occasion) the CC worked fine for the next 3-4 months. Each time I was hoping that it was fixed permanently, but it came back. Now the warm weather has returned, and it's happening again. I would like to figure out why it's happening, if not fix it, before the car eventually departs (it won't last forever, unfortunately). The several attempts to diagnose it at dealerships have failed - it's working fine when there, and the scanning tool shows nothing (admittedly that's what they tell me - I have no idea what tool they use and which parameters they read). Can somebody (maxpower?) suggest a sure way to diagnose the reason? Do I need to go to a garage right after it shuts off, with the engine left running? (Usually that's impossible, because it happens on the road far from known dealerships/garages and I can't drive the rest of the way w/o CC). Do I have to tell them what specific scan tool to use or which specific parameters to look at? Or maybe something else to look for?
