How many gallons of coolant does a lesbre buick use to fill the radior

32 to35 is recommended .

Add 38 gallons of water to the current mixture assuming you have a 250 gallon tank. This will bring your current ration back to 32 to 1

99 gallons / 23 = 4.3
4.3(32-23)=38.7

99 gallons + 38 gallons = 137 gallons.
250 gallons - 137 gallons = 113 gallons Left to fill
113/32 = 3.5

Add 3.5 gallons of coolant to the remaining 113 gallons of water needed to fill your tank completely.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Could be any of the following:
Low coolant level
Air in cooling system
Bad water pump

Coolant should be mixed in most cases to a 50% concentration, meaning one gallon of undiluted coolant will provide two gallons of diluted coolant. Most engines will hold 2-3 gallons of coolant mix. I normally purchase two gallons of undiluted coolant. I pour the first gallon of undiluted coolant into the radiator, then fill the empty bottle with water and add that to the radiator as well to make it a 50% mix.. Then, I pour half the second bottle of undiluted coolant into the empty coolant bottle, and then top both off with water to make two gallons of 50% mix. I then add coolant to the radiator as needed until full, keeping the remainder for topping off later as air purges itself form the system.

Could be in the engine.

what engine 3.4,you problem no coolant DO NOT DRIVE.try head gasket fix good stuff I try.$30.00 to 50.00.

vaccum leak,EGR may is good,check tow lines near thermostat,for crack

bad head gasket

THE PROBLEM SOUNDS LIKE LOOSE WIRING CONECTIONS IN THE DRIVERS DOOR , BEST THING TO DO IS HAVE A LOOK OPEN UP DOOR PANEL AND CHECK ALL CONECTIONS, GOOD LUCK

Are you sure the coolant is still low in the bottle. The coolant sensor thats in the bottle has a float that can stick. If it sticks the low coolant light will stay on even if the coolant level is right. Try tapping on the coolant reservoir bottle in the area where the electrical wire enters it. Not too hard. If that is the porblem the light should reset.