It is a very bad idea to drive a car without coolant. You will overheat your motor and risk warping or cracking your head(s) and blowing your head gasket. It's also not good for water pumps to operate without coolant in the system.
If it's an old Volkswagen, as long as you like (VW bugs had air-cooled engines).
Not for very long, the coolant will splash out to a point where it will overheat.
It will be safe to drive short distance as long as the car does not over heat. You can top up the engine coolant or use water/coolant mixture till you fix the problem which could be leaking hose pipe. leaking radiator or faulty radiator cap
drive it without coolant
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You can, so long as you monitor your coolant level. You'd be best advised to have the leak repaired ASAP.
If it's stuck open, yes you can. If it's stuck close, no you cannot drive the car.
No, you run the risk of destroying the motor.
Nothing all overfloo is extra coolant latter the car will be are on the normal level of coolant after a couple miles.of drive.
4 miles in winter2 miles in summer
Once you have all of the air out of the system, you can drive it immediately. Fill the radiator with coolant, set the heater to hot and start the car. Watch the coolant level and keep refilling it until it will no longer take any more coolant.
The answer is Yes, The car will run and drive but here are a couple of examples of what is happening. Blown head gaskets allow anti-freeze coolant to flow into parts of the engine it shouldn't. If the coolant is going into the piston cylinders the car will smoke a lot. If it is going into an oil passage it will turn you oil into a milk like state. Lastly the bad gasket may just allow the anti-freeze to leak out of the engine onto the ground. In all cases the car will drive but not for long.
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