Stuff on radiator cap..

[Supreme Cutlass]

pulled off the radiator cap to check the coolant and found this;

 

Here's the same stuff on a sheet of white paper. feels kinda like grease.

 

Any ideas?

[ToroToro]

Doesn't really look like it, but it could be the stop leak SHIT GM puts in the cooling system that sludges up into a brown mess. That would be my only guess.

[Supreme Cutlass]

nope, I've never taken the car to GM or used stop leak.

[1BadPrix]

He ment the stop leak they put in from the factory when the car is made.

Have you ever had your fluid changed.

If it is the original fluid then it probably is the factory stop leak that has gunked up.

 

 

William

[5speedz34]

Someone Jerked into your radiator.............

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

J/K I wouldn't worry about it since these cars are so old. I would just flush it and be done wiht it.

[Supreme Cutlass]

I flushed the system over the summer, but now that I think of it I did replace the upper radiator hose, could that be it? I just wanted to make sure it wasn't a sign of gasket failure or anything serious.

[5speedz34]

I flushed the system over the summer, but now that I think of it I did replace the upper radiator hose, could that be it? I just wanted to make sure it wasn't a sign of gasket failure or anything serious.

 

 

No. Coolant doesn't really touch the cap, and when it does its not that often, leaving it able to dry and form a gunk. Clean the cap off and check it in a few weeks if you are really concerned.

[White93z34]

clean it off, and see if it comes back.

[TylerW]

Ok, my '94 Cutlass has the same gunk building up on it, except its more rusty brown..looks like #2.

 

Any tips on flushing the cooling system?

 

Thanks...

[Supreme Cutlass]

Ok, my '94 Cutlass has the same gunk building up on it, except its more rusty brown..looks like #2.

 

Any tips on flushing the cooling system?

 

Thanks...

 

Put in a coolant flushing tee, and go from there.

[Supreme Cutlass]

Ok, I checked and it's building up again... I'll probably flush it again with radiator cleaner, etc. in a week or so.

[Canada]

Did you put any additives in there? It sounds like you do the cut the radiator hose method of flushing.

[Supreme Cutlass]

Did you put any additives in there? It sounds like you do the cut the radiator hose method of flushing.

Nope, no additives. I use the Prestone "flush 'n' fill kit" if that's the cut the radiator hose method...