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rpmdiag, Tech and Instructor
Category: Cadillac
Satisfied Customers: 8073
Experience:  Since 1975
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My 99 Cadillac Seville is overheating quickly, idles very

Customer Question

My 99 Cadillac Seville is overheating quickly, idles very high will not idle down, checed code reads not communicating with computer.
Submitted: 1 year ago.
Category: Cadillac
Expert:  rpmdiag replied 1 year ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

Two separate issues here, but the overheating can be from a bad T- stat, plugged radiator, fans not running or a water pump with worn out fins. As far as the no communications, that needs to be diagnosed electrically.

Thanks, Ron

Expert:  rpmdiag replied 1 year ago.

I'm following up to see if you have any more questions.

Thanks, Ron