I was doin my normal fluid check this morning and noticed a lot of brown sludge, looked like mud to me under my radiator cap and some inside the radiator. Anybody got an idea or know why?

 

And I'm not overheating either.

 

That's what happens to antifreeze when it goes bad... time to flush fluid

 

That is for sure , but another cause that makes your antifreeze look like that is that fix a leak crap.

 

I just flushed it last month tho , it couldn't go bad that fast

 

After the flush, did u re-fill with the correct amount of antifreeze/coolant?

 

Yea, I also replaced the water pump, could I have a bad water pump?

 

A bad water pump would not fill the radiator with mud.

Who did the flush?

 

Bad head gasket will cause exhaust gases and carbon to escape into anti freeze staing it or discoloring it. Have a shop pressed test ur system and you will find the answer

 

X2

The flushing your radiator last month information would have been good to have at the start of the thread.

 

He's got either a blown head gasket or cracked head.

His coolant and oil are mixing.

Bearings are probably wiped by now.

 

What year and engine? Include this in every post.

That information is important, especially for symptoms like this.

 

'96 country 4.0 automatic. I drove it yesterday and had no problems.

 

could be, but probably not the case. my coolant looked like that. how did you do the coolant flush. there is a correct way and an incorrect way to do it. doing the correct way you should not be seeing the brownish coolant for a long time

 

If my heater core is clogged or is going out would it cause it?