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the so called sludge is most likely some sort of cooling system sealant.

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Q: Why is there sludge in your reservoir from radiator?
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Related questions

Why is there mud in your radiator?

Mineral sludge from tap water. A good radiator flushing will help and then use proper coolant to help keep the sludge building up and blocking the radiator.


In a 93 Toyota Camry do you put the the coolant in the radiator or the reservoir?

Both. The reservoir is the overflow. But in the event your radiator is low, your reservoir will back it up.


Sludge in radiator?

Time to replace the head gasket.


What can you use to get sludge out of your car?

You can use plain water to get sludge out of your car radiator. You can use Marvel Mystery oil to remove sludge from the oil pan.


Grey sludge in radiator?

Time to replace the head gasket.


How does an automotive radiator reservoir work?

A hot radiator releases excess coolant through the spring-loaded cap in to the reservoir, and when cooled the partial vacuum created by cooled radiator pulls it back in. A reservoir should be only about 1/4 full cold on a system that uses a radiator cap, some cars have a pressurized cap on reservoir and no cap on radiator


Why does the coolant fill up the reservoir and not return back to the radiator leaving the radiator bone dry on a 93 Honda Civic DX?

Why does the radiator fill up the reservoir


Can you overfill a radiator reservoir?

Yes


Where is radiator cap 2001 saturn?

The radiator does not have a cap, instead, the coolant system reservoir is also pressurized and the pressure cap is on the reservoir.


What goes in the reservoir next to the radiator?

If the reservoir has a hose that travels to the top of the radiator, then it is filled with engine coolant. If the hose is not connected to the radiator, then it is most likely a windshield washer bottle.


Where is the radiator cap on a 2001 Ford Taurus?

The raiator is a type of system where all fluid is added to the reservoir instead of the radiator directly, look for the reservoir and you will have found your radiator cap.


When filling up a radiator shold i poor a 50 50 mix into the radiator and reservoir or will the reservoir automaticlly pour into the radiator.?

My guess is that it should pur itself but double check with a parts store.