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Yes, if the air pocket is large enough to prevent proper coolant circulation.
To prevent the coolant freezing, to help keep the system clean and prevent corrosion and to make the coolant more efficient in cooling the engine.
It can prevent coolant flow, which can cause a catastrophic overheat.
The antifreeze is half water but has chemicals to prevent corrosion of the water based system. I would recommend getting the cooling system flushed.
coolant is used to keep the reactor cool and prevent it from melting down. The amount of cooling that is required really depends on the the amount of heat being put into the coolant.
dexcool is blamed for many cooling system problems
Watch your temp gauge, if its getting really hot, that is to prevent damage. Check your coolant levels, if those are fine you probably have a problem with your waterpump, thermostat, fans or some other part of the cooling system.
It sounds like you have a blown head gasket. Combustion gases can enter the cooling system through either a blown head gasket or cracked cylinder head. The gases (under pressure) force coolant out of the reservoir. This also causes a void in the upper part of the cooling system , leaving no coolant at the thermostat and the coolant temperature sending unit. The result is a erroneous temperature Reading and will even prevent the thermostat from opening.
Cooling systems can boil up from lack of heat dissipation. It can be cured by ensuring the cooling system has the right level and mixture of coolant. Also dirt, buildup and particles in the fluid can block radiators and cooling system parts that prevent the cooling system from doing its job.Replace the radiator, and thermostat to start out fixing this problem.
The thermostat is closed, I usually prevent this problem by removing a heater hose or other small line that is near the top of the cooling system on the engine and then fill until the coolant is full inside the engine, then replace the hose, top up coolant and test run.
If your car is overheating, then a condition exists which needs to be diagnosed and corrected or repaired. It could be bad coolant, poor coolant flow, blockage of air through radiator fins, bad thermostat, or a number of other things.
Use the radiator cap as bleed valve. Make sure coolant is always to the top of fill tube to prevent more air from seeping in.