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Re: GMC LS Swap Radiator question
the outside of a radiator can appear to be in good shape, it's always a good idea to lower the coolant level enough to see down inside the rad at the ends of the cross tubes and see if there is any build up there, blossoming, and if so use a commercial rad flush additive, as per directions, then allow to cool and drain the system, pull the block drains, back flush the heater core, etc etc. remove the overflow res and clean. then reconnect everything, install the plugs and refill with fresh coolant
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