I was seeing the same on mine, especially at the radiator cap and inside the reservoir, it's still in the reservoir since I couldn't clean that out but I'll be replacing it soon with a clean one. If I ever find one
Had mine flushed and switched to green stuff, all is good now

And mike I never knew you could just disconnect the sensor lol I wish I would've known that when I had my silver monte! My sensor had gone bad and would always cause the low coolant light to come on it was annoying as hell lol

On my 01 silver the sensor was located on the passenger side of the radiator right below the cap. I can't seem to find it on my 03 though haha :p

 

Don't know if that is serious or not

 

Thank u big time !

 

We're glad we could help out.

 

The newer dexcol they claim wont do that. But when you see dexcol browning its worn out and need replacing.

 

Which radiator flush fluid would you recommend to stay away from or use?

 

Seeing this thread helped me out, I got worried also when I saw that brown crap on my radiator cap