coolant does not just disappear, it has to be going somewhere.either an internal or external leak. if it were me i would pressure check the cooling system and cap and perhaps do a block test to look for products of combustion in the cooling system.i bought a universal radiator overflow tank at my swap meet last spring and was wondering why its always empty. i fill it up and then the next time i check it its empty again. the radiator has plenty of water in it always. is it just flowing over and dumping through the drain. and another question i have is what is the point of having radiator caps that will release with enough pressure? the pressure should drain out of the overflow tank. the tank holds one quart. thanks
the radiator cap will allow a larger amount of pressure to release than the 1/4" i.d. tube that vents to the overflow. this is so it can release that pressure before something horrible happens. if your car is venting constantly to the overflow tank then the cap is probably bad. if it is just pushing the normal amount of fluid into the overflow and the overflow is too small then eventually it would lose fluid. i believe the factory overflow is larger than one quart and probably that size for that reason.but what im saying is that it would just vent out of the overflow tank anyways so why would it matter if the cap can release pressure or not? it is going to vent anyways. and i know that im not leaking or burning coolant so it must be overflowing when it gets hot and expands. and i didnt say it was dissappearing, what i meant was do i need a bigger tank for the car than 1 qt. i know that it is flowing over i just wanted some input on the tank size if its wrong.
the radiator cap will allow a larger amount of pressure to release than the 1/4" i.d. tube that vents to the overflow. this is so it can release that pressure before something horrible happens. if your car is venting constantly to the overflow tank then the cap is probably bad. if it is just pushing the normal amount of fluid into the overflow and the overflow is too small then eventually it would lose fluid. i believe the factory overflow is larger than one quart and probably that size for that reason.
i bought a universal radiator overflow tank at my swap meet last spring and was wondering why its always empty. i fill it up and then the next time i check it its empty again. the radiator has plenty of water in it always. is it just flowing over and dumping through the drain. and another question i have is what is the point of having radiator caps that will release with enough pressure? the pressure should drain out of the overflow tank. the tank holds one quart. thanks
Something doesn't sound right here. The radiator cap is what allows coolant to flow to the overflow reservoir on the 94-95 Mustangs. Our radiators have a stock 16psi cap. Once the coolant reaches 16psi, the spring in the cap compresses and exposes the hole that leads to the overflow, allowing coolant to flow to the overflow tank. When the pressure drops, a vacuum is created that sucks coolant back into the radiator from the overflow tank until the pressure drops below 16psi, then the spring in the radiator cap pushes down and closes off the hole leading to the overflow tank.
Coolant venting to the overflow tank is normal. There are markings on it showing "COLD" and "HOT", showing about how much coolant should be in the reservoir when the engine is cold or hot. If you overfill the reservoir when cold, you may get coolant pushed out of the reservoir when it's hot. You can also puke a bit of coolant out of the reservoir if your car is really hot and you shut off the car. Since the car is not moving the coolant continues to heat up for a while and in some cases can overflow the reservoir. Otherwise, the only time you'll overflow the reservoir is when you have overheated the engine.
Other cars may have a different system, but this is how our Mustangs work.
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