I see now. You are using the Bar's leak that is the brown babyshit right? Don't use the silver stuff. It don't work that good on our trucks. Honestly, you don't need to worry about draining the coolant. I have never had an issue with it. key thing is to get rid of the water in the cylinders by pulling the glowplugs first and then cranking it over. Water will get into the crankcase initially but the bar's leak will seal it up. Get two of the pint sized jars, throw it in and fire it up. while running, fill up with water and let the stuff do its job. Coolant is not going to affect it but don't put any in tho, just straight water to get you home.