The Northstar engine until about 2002 had lugbolts that were too short. So it blows a headgasket climbing hills. $3500 to repair with new longer bolts. No old high mileage Northstars ,only dead ones. Engine not considered rebuildable. A Cadillac engine design mistake (30 yr Cad owner)
Just purchased my 99 STS 2 months ago after my 94 Eldo was backed into by a raised pickup;
I had the Northstar oil leak controlled in the Eldo - it only had 88K miles on it - just loved the style/ ride;
the STS has 1 previous owner; actually a "little old lady from Pasadena"; carfax showed 30+ entries for ALL services at dealer in Pasadena area; she even bought the tires there!
No evidence of any major probs in the records;
but then again, surprises do happen!
Love all the bells and whistles; this car is the stunning metallic green with caramel interior and gold striping; every option available including the huge console telephone - also wired into the car with steering wheel controls/ mic overhead and deeper in the console the cd changer;
one can get OnStar with the car for the typical redic price!
all the memory features are wonderful;
turns out the car had a small coolant leak - tube from thermostat to something else; which was dribbling coolant on two electronic components of the stability track and ABS systems;
dealer wanted $999. for one and $3000 for the other component; my guys got both for $1000 plus the installation/ coolant system service/ oil service and new battery I was out the door for $1600;
a man's gotta have an honest mechanic for sure these days!
Still miss the sleek look of the Eldo though.
I absolutely LOVE the feel of sliding in my car, turning that key (steering wheel, Seat AND mirrors adjust accordingly) and feeling that sexy piece of Northstar purr. But on the honest note, It has it's problems. I bought it used w/ 130,000. I've had one episode of overheating. Aside from that, It'll go to 3/4 temp gauge, drop and run nominal from there... If anyone has an answer for that, Feel free to holler at me! Anyway, INCREDIBLE car. Totally worth the money as long as you're willing to put some more into it!
THE CAR. From outside to in, I love it. Every comfort you could not need, but want, It's there. I don't even have the keyless FOB and I have NO quarrel with any feature.
MOTOR!!! It's extremely aggravating to have such an awesome car that I can't rely on. I live in Phoenix. Throughout the Phoenix-Metro area is about the range I trust it to travel in. Also, Cadillac follow through with standard GM parts in the A/C unit, So of course it fails.