The '62 261 school bus engine in our '40 Chevy sedan still runs great, but the coolant is disappearing. I can not see where it is going, no visable leaks anywhere. I'm worried that it's a head gasket problem. I see no steam out the tailpipe. I'm going to remove the sparkplugs and see if any of them look different. The head gasket is a blue Felpro and has been on the engine less than 10,000 miles. Wish me divine guidance, please.
