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There are lots of causes why an automobile overheats such as loss of coolant due to leak, insufficient heat conductivity within the engine due to deposits in the water jackets, worn out thermostat, inadequate air flow going through the radiator, defective radiator fan, loose water pump, corroded radiator hoses, worn out radiator cap and radiator filler neck. Some of these damages or defects are easy to fix but when it comes to worn out parts the best option is always to replace it with a new one. The repairs to be done depend on the damaged parts. For instance, if the part for replacement is the radiator filler neck you would also need to change the radiator cap due to damage rubber seals. A worn out filler neck can affect the sealing performance of the radiator cap leading to coolant leakage, trapping air in the cooling system, poor heater performance and then finally engine overheating. A friendly reminder in purchasing a filler neck make sure that it's the exact fit and type as the worn out model since an irregular filler neck can deform the rubber seals of the radiator cap doing more damage than good. You may check out Auto Parts Warehouse's wide selection of top-of-the-line cooling system parts for your radiator filler neck requirement. All of our products are backed by extended limited warranty plans. We also have a 24/7 technical support to assists you with your purchase. What are you waiting for? Shop with us today.