Yes , mine has a cold and hot mark , the coolant should be up to the cold mark when
the engine is cold
To check the coolant level of a vehicle first see look for the overflow reservoir. There should be a coolant dipstick with a level gauge on it. Remove it from the reservoir to see the coolant level.
There is no cap on the radiator; instead, the coolant reservoir is pressurized along with the rest of the cooling system. Look on the passenger side, under the hood. You should see the windshield washer reservoir AND the coolant reservoir. Be careful with the lid of the coolant reservoir. If the engine is hot, it will blow off in your face.
The radiator cap could be the cause of coolant reservoir overflow or backup. Have the cap checked to see if it is bad.
The coolant level is set by the level in the coolant reservoir. There is a line for the level if the engine is cold and a line for if the engine is up to temperature. You should fill it to the corresponding line.
Looking into the engine, on the far right there is a visible coolant reservoir near the hinge of the hood. On the side of the reservoir closest to the center of the engine, there should be large markings for minimum and maximum fill. Given the bright orange color of the recommended coolant, it should be easy to see the level.
It is usually marked, but halfway should be good.
In the coolant reservoir when the engine is cool.
It should be attached to the radiator.
Its inside the coolant overflow tank/reservoir (its the plastic reservoir where you pour in your coolant). Look on the side (the side that faces the engine) and you'll see an electrical wire is connected by a harness. That's your coolant level sensor.
If there is a cap on the radiator you can check to see if the radiator is full , and if it isn't , " top up " the engine coolant . Otherwise , you check the engine coolant level at the engine coolant reservoir when the engine is cold and maintain the level at the cold mark
Remove the coolant reservoir, flush it out, reinstall it and refill with proper coolant.
The coolant reservoir on the MK3 jetta is located against the firewall. It is a small round reservoir.