So I have a 2001 LS 4 Door 5 Speed. 111,000 miles. I know that this issue has been addressed in many threads, but feel (hope) as though my case may be a little different.
The symptoms: A few weeks ago, the blazer's temp gauge started creeping a little above 210 at a traffic light. I stopped and checked the coolant reservoir only to find that it was empty so I bought some. I know all about the horrors of mixing other coolants with dex-cool etc etc but I needed to add it. After that, the truck stayed at 210 no matter what the conditions. I've been waiting for the oil to start showing signs of the intake gasket failing, but the oil looks normal and isn't exceeding the "full" mark by much. The only reason I'm suspecting the famous failing intake gasket is because I can't find a leak anywhere.
Is it possible that the radiator was low on coolant and is topping itself off or is that a ridiculous remark?
Wouldn't the oil be like a melted chocolate milk shake if coolant was getting into the crankcase? I am prepared to accept the fact that the lower intake gasket needs to be replaced, but the problem is that the truck is not showing the only sign: milky oil. There's no smoke, no knocks from the motor.

 

Check around the valve covers for signs of coolant. When mine first started, it didn't drip. I just noticed the small puddle. Also, if it is leaking, you want to stop it before it gets in the oil. It wont always mix and make a milkshake. It's not as bad of a job as it sounds if you have to do the LIM gasket yourself.

 

Ok, I'll do a more thorough exterior check. And I've been going back and forth between whether I would do the gasket myself or take it to a shop. It may be wishful thinking that my gasket isn't the culprit.