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Yes coolant will come out so you will need to get some coolant prior to doing this job. Depend on the hoses condition, now is the time to replace them if need be. I replaced all 4 hoses as a preventive maintenance. If you decided to replace the solenoids in place, you will need a flex extension. Also, don't forget to label the connecting plugs as you don't want to miss match them. One for the inlet and one for the outlet.