Go to a diesel repair shop to have a radiator drained ! I DID !! I did not want to risk twisting the drain cock out of the radiator trying to remove it my self...... my 'go to radiator repair was 'TOO BUSY TODAY' to handle my job and suggested "I wait until tomorrow" I actually was able to secure 'an appointment' to drain and refill my FORD Farm Tractor radiator at Diesel Works. Your office crew was exceptional. Your mechanic, DJ, was very, very professional. We also were able to drain the engine block, many radiator shops would have even overlooked that option. I was very pleased with your services and since, have sent my sons truck in for repairs to friction related holes, in his diesel fuel line. Hoping to visit you in the NEW Shop soon Buck Maddrey tel: 757-464-2100