2000 Cadillac Deville over heats

First thing to check is the cooling fans, turn on the a/c, cooling fan should start with the a/c. If ok turn off a/c, bring car to operating temp, does the fan come on or does it overheat?

My 2000 did the same thing. I had an internal leak which would cause cooling system to cavitate. I too changed water pump, cooling fans and hoses to no avail. Problem was leaking head gasket. Problem solved but is very expensive. Engine and trans :( mission must be lowered out of the car to facilitate the removal of the cylinder heads. This costs about
$ 2000 no matter if the dealer does it or private owned garage. Not all are equipped for this job.

Sounds like head gasket problem, the head bolts will need to be helicoiled, this is you real problem

Bolt holes are typically checked as part of repair process.

That isnt a check its what the problem is. In my 5 years as a caddy tech and group leader I never seen a headgasket fail, its always the headbolts- the threads pull out of the block

Ego deserves no reply.

To the man behind the ego, you should have just answered the mans question and been done with it. Any one that can see to do the job would be able to tell if the threads pulled out.

Also ck the water pump and belt tensioner and belt.

Ed sorry but your giving wrong advise, that will cost these people more money for your bad advise. It isn't ego its your bad advise and wrong answers that makes me mad, people getting taken advantage of because of not knowing, that is why I am here