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I have a 1993 Cadillac sedan deville, my cruise control has…

I have a 1993 Cadillac...
I have a 1993 Cadillac sedan deville, my cruise control has become intermittent. sometimes it works fine and sometimes it does not. Could be related to cold mornings when it seems to be worse. the green cruise light will flash on temporarily and then cut off. could there be a vacuum leak somewhere and how is best way to troubleshoo this. thanks bob
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Answered in 8 hours by:
3/28/2018
Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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The most likely issue on this is the stop lamp switch on the brake pedal. You might try driving it, then put your left foot under the brake pedal and pull up on it, while engaging the cruise. If that solves the problem, you definitely need a stop light switch. Even if it doesn't solve the problem, you might still need one, but if you can confirm it, that's a quick way to do it.

We did have problems with the cruise servos leaking vacuum on those, you can usually see a tear in the rubber on the servo and confirm that failure, but a leaking servo would not be intermittent. The servo can also fail internally, I would do a process of elimination before replacing it, but if you put a stop light switch in it, can't find a vacuum hose problem or any other problem, and nothing else is making sense, that's the point at which you could put a servo in it.

There are diagnostics for this, but they are complicated, I'm not sure I could walk you through it, but they do exist.

Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 5,694
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Verified
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Customer reply replied 4 months ago
thanks Jerry I will give that a try
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