50/50
50% water to 50% coolant is the standard unless you live in a very cold climate where it goes down to -25 degrees F or lower, then you may want to mix 25% water to 75% coolant but never straight coolant.
50/50 for most application
Most likely reason is that it is rusted out. Improper coolant to water ratio can help freeze plugs rust from the inside, and wet weather will help it along on the outside.
You need a 50/50 mixture of water and antifreeze.
Only in an emergency. Antifreeze/coolant provides anti-rust agents, water pump lubricants, lowers the freezing point, and raises the boiling point.
Usually 50 / 50 mix ( Ford states not to exceed 60 % antifreeze and preferably distilled water )
Any Ethylene Glycol based coolant mixed in a 1:1 ratio with water. Prediluted means it is already in the correct ratio.
The proper ratio depends on the temperatures your vehicle will be operated/stored in. Typically, a 50/50 ratio will be just fine. If you will park/store your vehicle in extremely cold (sub-zero) temperatures, you can increase to 60% coolant to 40% water.
The "Coolant Sensor", for the ECU, is right next to the water neck at the front of the engine. the "Coolant sender", for the temperature guage, should be on the back of the head at the rear of the engine!
Minimum 50/50. Maximum 70/30 (coolant/water).
you should only use a 50/50 mix of coolant and water, otherwise corrosion will destroy the insides of the motor
You would have a leak in the coolant system somewhere and you need to have the system pressure checked.............