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Tough to narrow it down with such little detail, but it sound like your car's thermostat may be malfunctioning and not controlling the temperature correctly.

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Q: Why is Coolant is full and engine overheats coolant is boiling in reservoir?
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Coolant pushing out from radiator back into coolant reservoir?

it is normal, when the coolant is hot and pressure built, the pressure cap allows the coolant to drain to reservoir to reduce pressure in the cooling system But, if it continually does this whereby the reservoir overflows and the vehicle overheats due to a lack of coolant actually in the radiator when cool, there may be an overheating problem or blown head gasket on the engine.


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Remove the coolant reservoir, flush it out, reinstall it and refill with proper coolant.


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You have reinstall the head gasket. It has been not tighten enough or damaged. Anyway the replacement was not done properly.


Is it normal for coolant water to go into the reservoir?

Yes- coolant reservoir is designed to accept excess coolant - As coolant heats up it will expand and flow to the coolant recovery tank (reservoir) and as it cools (contracts) it will be sucked back into the radiator


How much coolant to fill a 1997 Saturn sw1?

The amount of coolant it will take to fill your vehicle is dependent upon how low the coolant level is. You can add coolant to your coolant reservoir. The reservoir will have an indicator of when the coolant system is full.


Does a bad thermostat cause coolant to leak out?

It can if it is stuck closed the engine overheats causing hot air ( steam ) to flow backwards to radiator cap which releases and blows steam pressure into recovery reservoir which starts blowing out the coolant in the reservoir making a puddle on ground.


What is the cause of excessively high coolant level in the coolant recovery reservoir?

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Truck overheats 2 minutes after start then runs FINE any ideas?

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Can no coolant in reservoir cause engine not to start?

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How do you filling coolant?

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