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.
Engine coolant expands when heated. Heated coolant needs a reservoir to come and go as needed.
Yes
Coolant reservoir, or directly in the radiator. If you are having to add much coolant, you need to find out why. Serious engine damage can occur if it is leaking inside the engine.
You need to get one. Cars need it in the case if it's too much of the coolant. Without the reservoir the coolant in the case when there is some extra will go on the ground. Which is in some states is a crime because it's hazardous and not nature friendly.
Remove the coolant reservoir, flush it out, reinstall it and refill with proper coolant.
The low coolant sending unit is integral to the coolant reservoir. I just called two dealers, they were both $117 for the reservoir(!!). Before replacing, try cleaning the contacts on the connector, and also try cleaning the sensor in the reservoir with a long bursh before spending that much money.
The coolant reservoir on the MK3 jetta is located against the firewall. It is a small round reservoir.
The plastic coolant reservoir on the fender feeds directly into the coolant system. Just add coolant to the reservoir and if you have drained the coolant or otherwise emptied the system, you may need to check the level in the reservoir after running the engine, or more accurately, after the engine has cooled. Once the coolant level has stabilized, just check it periodically to make certain that the coolant level never gets too low.
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
Reservoir light? You mean low coolant light. Low coolant level means the reservoir is low of coolant.
Dexcool, I just had to add coolant (reservoir was bone dry!) to a 2007 Aura
at the bottom of the coolant reservoir tank.