Bad head gasket
Cracked head
Cracked block
Thermostat possibly stuck open. Another possibility is the heater core is clogged. I would recommend you perform a complete cooling system service. Drain and flush the system with the heater set to high. Replace the thermostat, and install a 50/50 mix of coolant and distilled water. Bleed all air from the system.
Probably because you have a blown head gasket. Get a compression check done to be sure.
Regular green antifreeze of any manufacturer will be fine in a 50-50 mix with water
50 50 coolant is what i use- would suggest no more han a 60 40 mix.
The GM vehicles use the DexCool anti-freeze. There is a replacement type of antifreeze that can be used in GM vehicles but you cannot mix them with the DexCool. To change to another type of antifreeze the cooling system should be completely flushed of the old coolant. I would advise keeping the same coolant as the manufacturer provides
no
For a 1991 Buick Reatta, the recommended coolant is a 50/50 mix of ethylene glycol-based antifreeze and distilled water. It's important to use a coolant that meets GM specifications, such as Dex-Cool or a conventional green antifreeze, depending on your preference. Always check the owner's manual for specific recommendations and ensure the cooling system is properly flushed before adding new coolant.
you always should mix coolant with water if it is full coolant. most coolant today says 50/50 on the package and is pre mixed in which case no, but if it is straight 100% coolant, yes mix with water.
50/50 mix of water and coolant is recommended.50/50 mix of water and coolant is recommended.
The 2005 Buick LeSabre typically requires a coolant that meets the Dex-Cool specification, which is an orange-colored antifreeze. It's important to use a 50/50 mix of Dex-Cool and distilled water for optimal performance. Always check the owner's manual for specific recommendations and guidelines.
You should not mix colors or brands of coolant.
Coolant can mix with the gas in the combustion chamber. This will happen if you have a blown head gasket or cracked head. Symptoms are white sweet smelling smoke at the exhaust, loss of coolant with no apparent leak, miss on one or more cylinders, & loss of power.