easy way to keep coolant in proper containers is to stop filling it all the way to the brim and leave a air pocket under the rad cap ... fluids dont compress, i read the way you are filling it and it is a bit over kill. Something to think about

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1996 s10 zr2 with a 6.5 turbo diesel
1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car