Sounds like your system has turned to rust! I've seen this before (a very bad case too). Try this solution to flushing out the system! GM P/N: 12346500 Prestone Heavy Duty Cooling System Cleaner Read the directions throughly too! You'll nned a new T-Stat/gskt, 2 Rad Caps, 8L DexCool, a Flush Tee and patience. This stuff is VERY COROSIVE! Don't leave it in too long or you'll be sorry. Doing this WILL CLEAN OUT YOUR ENTIRE SYSTEM! After which, you can refill your system back to specs.

I'm not so sure. Those were my temps too, more or less. Maybe a little warmer. My radiator cor looks like it was installed yesterday, and there'* no evidence of rust anywhere. (I ran a borescope through some of the passages when I pulled my sc).

Al, if it'* a rust problem, his core should be the first indication, right? I'd like to know what it looks like under the cap. That car is a bit young for a rust problem.

I'll check under my cap b4 I leave work.....I'll post when I get home ....

No Will, The Water Pump impellers are made of metal & rust off, causing the water pump not to circulate the coolant! Since the water pump has been recently replaced, this might be why they had to replace it! This would also cause the higher engine temperatures too! Also, just because the car is "young" doesn't mean it'* been properly maintained either! No offense intended or implied Dylansdad!

Maybe I should refraise it! What I meant was you can't just drain the cooling system & refill it with DexCool! An intensive "Flushing" of the ENTIRE system is needed to rid it of every trace of Green Coolant before DexCool can be substituted instead.

Well, where do I start......first off the water pump was replaced probably 60000 miles ago not recently. It was due to the fact that it had started leaking. The dealer did the work and to be perfectly honest the temp has never been like it was b4 the change of the pump.
Next, not that I was or am offended but I can assure you that this B'ville has been anything but neglected. I bought it 1 yr old with 13000 on it and all records. It has been quite a pain from time to time with crazy little things happening. I now have a leaking trunk that I have to figure out and just was looking for some way to get this car to not run quite so warm.....

Now for all of those trying to help, the cap looks like it has a coat of oil on it or something, the water beads and when you wipe the rubber seal with your finger you get what feels something greasy and black.........is the seal being broken down.........what gives.........???

Definately sounds like that Rad cap seal is starting to fall apart.

is it possible that oil ? has gotten into the system ..........if so how, cause I know there is no mixing in the oil pan or showing on the dip stick..........

Doubtful...unless someone added some to your cooling system directly!

Here'* a great learning site about pros and cons to DEX-COOL {www.penray.com/organicacid} After you read this you may change back to the old coolant. Another thing is why don't people use or indorse distilled water,can't hurt?