Chain auto parts stores rent cooling system pressure tester. I know of know better way to know for sure where all leaks are coming from, with the exception of a head gasket.
Very simple to use. Perform test on a cool engine.
I went thru a frustrating coolant loss problem on a 126 car and would never have found it were it not for this device.
My 2 cents.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.