checked my engine coolant today and it wasnt the normal green color, it was like a light brown color like it was dirty. What could have caused this?

 

96 and above GM cars came with dex cool. it is a orange color. If you car is 96 or above that could be it!

 

nope cars a 94 trans am lt1 a4

 

I have a 94 Z28 and I just drained the coolant and it looks the same. If you look close, you'll see a light green tint near the top of the jar you drained it into. Anyway, in my case, the light brown was rust. Not bad, but I should have changed the coolant more often. I'm going back with the normal green antifreeze.

Thanks,
Glenn

 

Rust and algea. Time for a coolant change and flush of the system.

 

yeah i have a 94 Z28 and mine looks the same too.
the back of my radiator cap was all rusty.
is it something with the 94s?????

 

I have a very similar problem in my 1995. Everytime I drain the radiator the antifreeze looks like a light brown. I have never put that antifreeze back in. I then always fill it back up with fresh green antifreeze. Then 2 weeks later without even driving the car I drained the radiator again and the antifreeze is a light brown again. I don't know what to do. My only thoughts would be to drain the radiator and the entire block by taking out both drain plugs then completely flush everything and then fill it back up with new antifreeze. Just some thoughts.

 

Mine is a 94 and the coolant is the same color. Im gonna try to flush it and see what happens.

 

my old 94 did same thing- interesting

 

with the camaros with green coolant gm recamends a coolant change every 30,000 miles those with dew they rex the first 100,000

 

uhh.... what

 

thats what I was thinking...

 

no sereusly that is what they recomend i work at a shop that does all of this kinda work.

 

are you sure those with dew they rex the first 100,000?

 

damm you guys you are suppose to fksh your radiator every year...thats why u have all that sludge and nesty brown shiet......mines neon green no kind of sludge...thats because i flush it every year...best advice is to flush it and do it once a year.....