Big Bertha is in Harvest Al.
Down to see younger Bro. Brought oldest Bro and Wife With us. Goin to Grand ole Opry tonight and have to leave soon so only have a minute to say Hi Y'all.
11.47 mpg on the way down. Best she's ever done.
problem with motor-aid that i'll ask about. works fine until the Water gets hot then it starts leaking out the overflow tube above rear duels?
I'm thinking lime buildup in the pop-off valve. any ideas?
Hope you are all having a GREAT 4th weekend.

Mike

I'm thinking lime buildup in the pop-off valve. any ideas?
Possibilities: The tank should be full all the time (?). If so, and the safety relief valve -aka popoff- is fouled, it will leak all the time. The SRV will open when pressure is greater than its setting, so I will guess it is getting so hot it is raising pressure (steam?) and opening as it is designed to do. The engine coolant temp is probably 180 deg -higher straight out of the block- and on an extended drive the tank water temp will equal that.
Do you perhaps have a temperature-sensing relief valve on the tank??