Do a citric acid flush. Be sure to remove the block plug over starter when
flushing. Search here for the exact procedure. Search terms citric acid,
correct coolant. I changed my coolant without the acid flush. I used
that Xerex G5 stuff. I changed it first to the green stuff before I discovered this forum. I flushed all the green stuff out and replenished
with G5. Removing the block plug really makes a mess. Runs right up your
arm
.