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.
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.
Remove the coolant reservoir, flush it out, reinstall it and refill with proper coolant.
You have reinstall the head gasket. It has been not tighten enough or damaged. Anyway the replacement was not done properly.
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
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.
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.
coolant fan
Reservoir light? You mean low coolant light. Low coolant level means the reservoir is low of coolant.
The coolant reservoir on the MK3 jetta is located against the firewall. It is a small round reservoir.
You must check the coolant level in your radiator and reservoir. Low coolant levels can lead to overheating. If it's low, you may have a coolant leak that needs to be repaired. Good luck!
Coolant is used to keep an engine in a vehicle at a temperature safe for operation. If no coolant is in the reservoir, an engine will not start.
Add coolant to the full cold line on the coolant reservoir when engine is cold.