Enough to create a 50/50 mix of anti-freeze and water. This usually requires a gallon of antifreeze. You can purchase the 50/50 mix, ready to use. Pour it in the radiator.
According to the manual, 7.9 quarts.
You should use a gallon of coolant.
I think you are wanting to know the horsepower of a Ford Probe. But as you fail to list the year or engine size, it is impossible to provide an answer.
about 2900 pounds
115 horsepower
Brand New 1993 Ford Probe right off the show room floor cost me "$29 800.00"
The antifreeze should be diluted How much is up to you. Also be sure to configure in the location where you live (hotter, colder) as this also makes a difference I'm pretty sure that antifreeze needs some water to work properly (activates chemicals in antifreeze) If you went 70% antifreeze & 30% water you should probably be fine no matter where you live. ========================================================== Ford vehicles come from the factory with a 50 / 50 mix of distilled water and the correct type of antifreeze for the vehicle . Ford states not to exceed 60% antifreeze in the mix
According to my Chilton's Auto Repair manual : A 1989 Ford Probe gas tank holds ( 15.1 U.S. gallons )
The Ford Probe was discontinued in 1997 after 8 years of production. You can only buy them used. The comparable vehicle would be the Ford Fusion which has a MSRP of 21600$.
Drain & flush the system completely. Now add a 50/50 mix of antifreeze and distilled water until it is full. One gallon of antifreeze mixed with one gallon of distilled water should be more than enough.
Mix it half and half with the water.
Your 50 / 50 mixture of antifreeze and preferably distilled water should be right near the top of the radiator ( as long as you can put the cap on without the antifreeze mixture overflowing ) The plastic coolant reservoir in the passenger side of the engine compartment has a cold mark on it , just maintain your coolant level up to the cold mark when the engine is cold . ( Ford recommends to not drop below 40 % antifreeze and not exceed 60 % antifreeze in your engine coolant mixture )