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Honda Civic Del Sol Radiator Overflow Tank

Diagnosing Problems with Your Honda Civic Del Sol Radiator Overflow Tank

Modern cars are equipped with an expansion tank that catches excess coolant when the valve in the radiator cap releases pressure. The function of your Honda Civic Del Sol radiator overflow tank is to capture drained coolant. Older cars used to survive without this component; car owners used to install a bottle next to the radiator to serve this function. But those days are long gone. The radiator overflow tank does a better job-it does not only catch excess coolant, but it also siphons the coolant back in to the radiator as its temperature drops. When the expansion tank develops problems, you can diagnose and troubleshoot them by following the steps below:

Coolant drains out onto the ground

When you get out of your car after driving it and notice that coolant is draining onto the ground, start checking your radiator overflow tank for problems. Some tanks are made of plastic, which are prone to cracking. Sludge and residue might also have formed inside the tank, contaminating the excess coolant. This coolant will still find its way back to the radiator, and if it's unclean, it can damage other important car parts. When flushing the cooling system, clean out the overflow tank as well. This won't take a lot of your time.

Steam pours from beneath the hood of the car.

When you notice that steam or light smoke is coming out from beneath the hood of your car, one component you should start checking into is the radiator overflow tank. Steam is produced when there is an antifreeze leak, and the expansion tank may have developed a hole or a crack that's letting coolant out. Fix or replace the overflow tank once you have determined it is not a problem with the upper or lower radiator hoses, the radiator cap, or the radiator itself. These are some of the most common sources of leakage.

The overflow tank is always empty after driving.

Although this is not directly attributed to a defective overflow tank, this is a problem closely associated with it. The radiator filler neck or some of its parts may be compromised. A broken head gasket may also be the culprit in this case. However, it could also mean a leak in the overflow tank that's causing all the excess coolant to seep out.

Honda Civic Del Sol Radiator Overflow Tank Available Years

  • Maintaining a Good Working Honda Civic Del Sol Radiator Overflow Tank

    Have you ever asked yourself where excess coolant goes once your radiator cap releases pressure? It actually goes to an expansion tank that has the sole function of catching antifreeze. It has one of the simplest functions in the cooling system-catch the coolant, store it until its temperature drops, then let it flow back into the radiator. Although it serves a basic purpose, it should receive the same amount of care you apply to your other car parts. It is constantly under a lot of pressure from extreme temperature on both ends. When it becomes damaged, there is no other way but to shell out some dough and exert effort in installing a new one. Here are some maintenance tips to help you care for your radiator overflow tank:


    Clean the overflow tank regularly.


    You can do this when flushing the cooling system, since you're taking care of the radiator anyway. Drain the overflow tank of excess coolant that might have been contaminated with metal flakes, grime, or sludge. These substances can damage your expansion tank and can cause it to gradually develop cracks.


    Maintain the other cooling system components in a good condition.


    Your radiator overflow tank can only work well when its neighbors are in tiptop shape. If the radiator is not doing its job properly, for instance, the overflow tank might be catching more coolant than it is allowed to carry. The rise in temperature and volume might be too much for the expansion tank to handle, and can potentially damage it. Take care of the radiator filler neck and its gaskets as well. This tube carries coolant from the expansion tank back to the radiator and back to the expansion tank again. If the filler neck is full of grime and foreign elements, the coolant that goes back to the overflow tank might already be contaminated.


    Make sure the radiator hose is attached to the overflow cap properly.


    The operation of the overflow tank could be compromised by a loose hose. This can cause coolant to leak and drain onto the ground instead of into the tank. Make sure all hoses are properly connected, and that there are no seals or gaskets that are cracked or damaged anywhere in the cooling system. Once you've checked all the connections are in the right places, you'll know you've taken care of radiator overflow tank properly.