It sounds like the tank has a leak.
Yes. It doubles as an expansion tank for the coolant. Without it the system would be total loss and you really don;t want to run out of coolant on that engine.
You add the coolant to the reservoir tank located on the passenger side of the engine bay. Run the engine a little. Top off as necessary. If the car's a North American model, the resevior tank is located on the drivers side of the engine bay.
It depends on what you mean by "run out" but there is probably a leak in the tank.
Start by taking the top off of the coolant overflow reservoir. To bleed the system, run the 1998 VW 2.0 Beetle about 10 minutes, then check the coolant level. Add coolant if needed, then replace the reservoir top.
Depending where it is cracked, yes. A cracked head can also simulate an overheated engine by pushing coolant out of the coolant reservoir.
Normal causes are low coolant and an inoperative radiator fan.Normal causes are low coolant and an inoperative radiator fan.
Then you need to "accidentally" remove it ... pronto, which may mean flushing out the entire coolant system if the engine has been run.
After you have completed work on the cooling system and you begin to replace the coolant, open the bleeder a couple turns. As you pour coolant into the reservoir air trapped will escape out the bleeder. As soon as you see coolant come out of the bleeder close the bleeder valve and continue to add coolant to the reservoir until you have reached the full mark. Replace cap on reservoir. Allow vehicle to run through a drive cycle and cool down. Top off reservoir to full mark if necessary.
Open the hood and the Coolant reservoir on the '92 Previa is next to oil reservoir on the left side. Unscrew radiator cap from the coolant reservoir, add the 50/50 mix of coolant fluid into the reservoir. (Recommend use Prestone extended life coolant) Fill the coolant into the reservoir, it take about 3 gallon, and be sure that the coolant is pass the full mark of the reservoir. Now, turn on the car, during the engine running (about 10 minutes) kept check the level of coolant be sure it still maintains pass the full mark level. Screw back the radiator cap to coolant reservoir. Run engine for another 30 minute. This will ensure that thermostat is open and and ensure the fluid is circular all around of the radiator and hoses. Waite engine cool down, then open the radiator cap and check the coolant fluid level. If the level is low then add more coolant. Do not fill the coolant pass the full Mark's point. If the coolant fluid is still the same as in full mark then it is good. Continue to check the coolant fluid for next couple day. Besure that it is at the full level mark.
Radiator could be plugged or restricted
The water and coolant is put in the coolant reservoir for the location of this refer to the owners manual. It is best to do this when the engine is cold otherwise you run the risk of getting boiling water all over you. the mixture of coolant to water should be about 50/50.
There may be other reasons for the vehicle to be overheating but yes if you have let the reservoir run dry then it wont have suction to draw fluid back into the radiator so you will have to fill the radiator as well.