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The coolant reservoir holds excess coolant and in the event that the cooling system starts to run a little low it can draw more coolant. It draws coolant out of the system if it gets too hot and then feeds this back to the cooling system. This stops the system from running dry and also giving you a clear indication of how much coolant is in the system.
Typically a plastic container with a cap and a level indicator, it has hoses to draw coolant out of the cooling system and then to return the coolant to the system. It also serves as a way to top off the overall level of coolant in the car if needs be.
The coolant reservoir acts like a coolant overflow tank. It also shows you how much coolant you have in the system. If the reservoir is leaking this can lead to air in the cooling system, loss of coolant and potentially overheating.
If the coolant reservoir is leaking, cracked or out of shape, then you’ll need to replace it.
The mechanic will open the bonnet and locate the reservoir. They will then disconnect all hoses from the reservoir and unbolt it from the engine bay. The new coolant reservoir will be installed in its place and the hoses reconnected. The coolant system will then be topped off and test run.
It’s not too expensive due to the ease of access and cost of replacement parts. Expect prices in the range of $150 to $450
Only if there’s a problem with it. They typically last the lifetime of the vehicle without issue
If it causes your coolant to drain out and overheat your engine, it can be. If there is a problem, it’s a simple fix so get it fixed as soon as it’s needed.
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