With a flush machine, fill and drain ports are installed (usually temporarily) inline with either the upper radiator hose or the heater hoses. This is common enough now that most shops are equipped, but using a flush machine avoids that issue. This is best done with a vacuum device trapped air is suctioned out, then the system is topped off with new fluid, and then the vehicle is run up to temperature and topped off. With either of these methods, sometimes it’s necessary to purge the air from the system afterwards. Sometimes there is no petcock, and the lower radiator hose can be pulled instead, accomplishing the same thing. Then the petcock is closed, and the system is refilled with new coolant. Often, there is a radiator petcock that can be opened to drain the coolant. The most common method is “drain and fill”. A flushing compound isn’t always used and isn’t always necessary, but it is part of the cost if it is done. Then, the system is refilled with a new, clean coolant. The idea is that it dissolves and suspends old deposits allowing them to be flushed out more thoroughly. Typically, a compound will be added to the cooling system, run for a few minutes to circulate through the engine and get it up to operating temperature, and then, remove the old coolant. The coolant necessary for each vehicle is usually included in the price of the service.Īnother factor in the cost of a coolant flush is whether or not a flushing compound is used. OE coolant costs from $12 to $25 a gallon on average, so it does add up. This is because some vehicles with smaller engines take less than 2 gallons of coolant, while a light truck with a diesel engine might take more than 5 gallons. ![]() A significant part of the cost is the quantity of the materials. Some of the reasons for the variety in the cost are the differing labor rates and the cost of different vehicle-specific coolants. The average cost of a coolant flush can vary from $100 to $200.
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