![]() However, that is not how this Ford system was designed, and air in the top tank to provide expansion space is part of the design function. Hope that helps.Ĭlick to expand.That is true for many cross-flow or pressurized expansion reservoir down-flow systems (radiator cap on reservoir). Others simply fill to just above the core tubes, run to purge air, and adjust to same level as-necessary. From that point, it should never leak coolant unless in a hard overheat situation. It is not needed unless maintaining it incorrectly by overfilling.Ī common method used by mechanics was to fill it up, then let it run until a bit higher than "normal" (mild overheat about 30° above thermostat rating with sheet of paper on the radiator or whatever), then shut it down and let it puke the excess into a container. To prevent this, Ford began using catch tanks and catch bags to reduce warranty claims. However, if the radiator was over-filled, leaving no room for expansion, they would bring it in thinking there was an issue with ongoing overflow. When owners had an overheat, they would see steam and fluids, and bring it in for service. On overheat, excess coolant from expansion is pushed out the pressure cap.įord originally did not use separate overflow tanks, and simply routed the rarely-used overflow tube down towards the ground. Most original radiators have a cold-fill line. This is because a down-flow (top tank) radiator uses the top tank as the reservoir, and should not be full or near full except when fully warmed. In normal daily operation, it should not drip or puke coolant. To be clear, the overflow tank is only to catch excess coolant from overheating. This has worked for me for over 20 years, I run my Holly 750 carb 'slightly-rich', which may help somewhat with cooling. Fully closed system.Ĭoolant antifreeze is mixed 50/50 with water. Sucks back into engine when cooled.Īlways fill radiator to top and start with overflow tank at 'cool fill' mark. Overflow tank fills up about a quart after running. ![]() Temp runs 170 to 190 depending on outside temp and if running AC. hole to restrict flow).Īftermarket plastic overflow tank. Replaced thermostat with 'cored-out' thermostat (just a metal circle with about 5/8 in. Stock radiator, which was re-cored about 30 years ago. Here is how my Galaxie is setup to avoid overheating: I live in HOT South Florida, so my situation may not apply to everyone. Mine ride is a 1967 Ford Galaxie 500 with 390/4V Please note that the tool that you receive after placing an online order may be in a used but operable condition due to the nature of the Loan-A-Tool® program.Some nice suggestion above on how to deal with overheating in an old car. Do not wear ties or loose clothing when working on your vehicle.įREE Loan-A-Tool® program requires returnable deposit. ![]() Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. ![]() Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Use caution when working with automotive batteries. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Always chock your wheels prior to lifting a vehicle. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.īe sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Advice, how-to guides, and car care information featured on and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. ![]()
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