sounds like your head gasket is blown...
because there is If there is a muddy substance on the inside of a radiator cap it's because there is oil in your water. After oil leaks into the water for a while you will get a gooey muddy substance in your radiator. You'll need to have your head gasket checked first and move on from there.
Protects the root cap, made of a slimy substance aiding movement of root as it grows downwards in the soil.
chances are you have a blown head gasket.....that's about the only thing that can cause an oil type substance in your radiator......check your oil fill cap and area where the cap goes for a white foamy or creamy substance, if this is there that's your trouble
If you have a threaded cap on your coolant reservoir that is your " radiator cap "
No , the " radiator " cap / pressure cap is the thread on cap on the engine coolant reservoir
The radiator cap is on top of the radiator.
the radiator cap is on top of the radiator you idiots
A lot of vehicles don't have the radiator cap on the radiator , they use a thread on style cap on the engine coolant reservoir ( that is the pressure cap / radiator cap )
The thread on cap on your engine coolant reservoir is your pressure cap / radiator cap
The thread on cap on the engine coolant reservoir is the pressure cap / radiator cap
The thread on cap on your engine coolant reservoir is your pressure cap / radiator cap
The radiator cap is located on top of the radiator.