I'm having a nasty issue with an oil leak/cooling system on my 2003 3.2L CTS.
I purchased the car from my grandfather in early 2011 with 32,000 miles as a fun/summer car. He was a lifelong GM electrictian and this was his 14th caddy. Even though he is no longer able to drive (90 years old!!!!), I wanted to keep this car around for his (and my own!) enjoyment. The first couple months were issue free. In comes the leak...
I first notice a tiny leak coming from an area around my coolant resoviour. It was like no fluid I had ever seen before, so I popped the hood and noticed a chocolate milk like substance in the overflow tank. I soon realized the car was a bit low on motor oil when I checked the dipstick and the realization set in that I had oil in my coolant! The dipstick was clean of any coolant, as were the coolant hoses running to the engine. I imediately parked the car in my garage until I had a chance to get it looked at.
I call the dealership, they tell me it's a head gasket and is covered under warrenty (Oh wait, the car is 10 years old? sorry you're SOL). I found this hard to believe with 32k miles.
The engine ran fine with no issues other then this leak. It was never overheated and I stopped driving it as soon as I saw the milkly coolant. My mechanic replaced my radiator b/c he thought that was the problem and it was the cheapest solution to try first. No luck with that. I'm thinking it's an engine oil cooler with is a small part on the top of the engine that bypasses both coolant and oil.
What do you guys think it could be? Is oil cooler change a possible DIY for someone with a mechanic friend availible for help? Will the whole cooling system need replacement (ie water pump, radiator, lines/hoses)? Any links to a how-to or manual would be greatly aprecaited.
I really want to get this car running so I can continue to enjoy it with my grandfather for a bit longer before he passes. And before I get flammed, I've posted this all over the net. It's only fitting I give NS a shot at it, since some of you guys have suprised me with your knowledge in the past.