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Coolant Reservoir is commonly featured in Cadillac CTS automobiles; it is designed to prevent coolant spilling along with entering air into the engine cooling system. There are two main types of Coolant Reservoirs used in CTS vehicles: two types of the tank systems; the overflow tank systems and the expansion tank systems. In the overflow system, coolant gets to the recovery tank in cases of pressure build up beyond the cap's limit while in the expansion system, the tank is an integral part of the pressure containing cooling system and serves to accept the coolant fill in during expansion and shrinkage during contraction. Annual examination is advised to look for cracks or pinhole leaks and change of color due to product deteriorization from the years or from dirty coolant. As to The Coolant Reservoir, it regulates the amount of coolant required for proper operation of the Cadillac CTS' engine.