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.
Both. The reservoir is the overflow. But in the event your radiator is low, your reservoir will back it up.
The radiator cap could be the cause of coolant reservoir overflow or backup. Have the cap checked to see if it is bad.
because the entire point of the overflow resovoir is to overflow, and release uneeded water
A channel for an overflow of water, as from a reservoir
If the brake fluid reservoir is overfilled, the excess fluid runs through the overflow instead of over the bodywork, which would cause damage to the paint work.
clutch fluid. Small reservoir looking like the brake overflow reservoir only about 1/3 the size.
The engine coolant reservoir or the overflow bottle.
coolant overflow/reservoir tank
possibly a leak in cooling system
There is none. The "cap" is on the overflow reservoir.
the overflow res. cap is the radiator cap on the 97 cavalier
i am a female and know nothing about cars except gas and drive