If your radiator has brown sludge in it, then it's likely that the radiator isn't functioning as efficiently as it could be. The good news is that this problem is relatively easy to fix.
The first step is to identify the source of the problem. If the radiator is old, then the problem is likely due to corrosion. If the radiator is new, then the problem is likely due to a build-up of sediments.
Once you've identified the source of the problem, you can begin to remove the brown sludge from the radiator. If the problem is due to corrosion, then you'll need to use a brush to remove the corrosion. If the problem is due to a build-up of sediments, then you'll need to use a vacuum to remove the sediments.
Once you've removed the brown sludge from the radiator, you'll need to flush the radiator to remove any leftover debris. To do this, you'll need to add a radiator flush solution to the radiator and then run the engine for a few minutes.
After you've flushed the radiator, you'll need to add fresh coolant to the radiator. Be sure to follow the instructions on the coolant bottle to ensure that you add the correct amount of coolant.
Once you've added the fresh coolant, you should notice an immediate improvement in the performance of your radiator. If you have any further questions about how to remove brown sludge