I've got a 1999 s10 blazer zr2 and lately its been running kind of sluggish mpg has dropped enough to notice and when I take the radiator cap off the antifreeze is like a clay mud grease feeling and really brown I only use green 50/50 premix antifreeze. any ideas what this could be a problem its blows a little bit of white smoke out the pipe dipstick for oil is brown like used oil should be haven't checked the plugs to see if its carbon up or clean/ wet. any help would be greatly appreciated.

 

flush it really good and use dex-cool only your not supposed to use green stuff

 

You mixed the green antifreeze with the specified yellow antifreeze and you got mud. Take all the hoses off and remove the thermostat flush diligently with a garden hose......three times. After you get it clean, drive with water 50mi and clean it again. After that clean it one more time. Then put in the spec coolant at the spec concentration.

 

Flush it. Get a Prestone Flush Kit (or similar). Use any super-dooper radiator flush liquid. Two bottles. Then flush it again two more times. I have left the flush liquid in the system for a week.

Then switch to regular green antifreeze. DexCool is too much trouble.

 

All helpful tips thank you stand by with later results hope it's something that small

 

I dont know bout that. I use Dex Cool cause Im not smarter than General Motors.

 

everyone seems to absolutely hate dex-cool. i dont know why other than the fact that no one ever changes it. its only good for so many miles or years before it starts to "gel" and gumm up. its in the owners manual that you should change it. it seems to be one of the things that people dont think about changing. im only running the green stuff because thats what was in it when i bought it and i dont plan on going through the hassle of flushing it all out just so i can run dex-cool. the green stuff isnt going to hurt anything and its almost zero maintenance. i think that is why most people have switched over to it. no big deal either way.

but like LeWhite said, you ended up mixing them. you should get it flushed out as soon as you can afford to and put either one or the other in.

 

Yeah. Go with that! :-)

GM so smart they settled their Dex-Clog class action suit.

 

never had any issues with dex-cool all coolants should be flushed regardless of brand at cretin intervals/miles.

 

Let's not get this into another Dex-Cool thread or it will be closed.