Looking for some help, my 383 sbc is using up coolant. My over flow tank needs refilling about every 2 hrs of cruising around town. Nothing on the ground or any leaks that I can see. Not sure where I should look to figure out where it is going. Or what tests I should perform?
'89 Toyota pickup. Persistent leak. No evidence of leak while it was running, or overnight after run and parked. Static leak when it was not used for few weeks. Finally gave up on the way home from WallyWorld. Pulled in the drive and got out to open the gate and...coolant running down the driveway toward the gutter. Didn't proceed all the way to overheat, thankfully (overheat a 22RE and you got a warped head and blown gasket).
Leak was from poor fit at a radiator lower hose to intermediate pipe connection
I knew I was replacing the hose, so I shaved the rubber down so I could easily remove the hose.
My theory is: Was losing coolant just a little bit while hot and pressurized. Not enough to be visible. After shutdown the pressure bled off and it still didn't show visible evidence. When it sat for a couple weeks to a month , there was evidence of leak on the drip pan on the floor. After a few years of this it finally gave up, but not to the extent that the hose failed. My fault. Used the old hose when I put it back together after replacing the timing cover, spprockets, chain, tensioner, cover, etc. As you can see the hose was cocked on the pipe. Shame on me.
Check all of your hoses and connections, including clamps. Good luck