Forum Discussion

maillemaker's avatar
maillemaker
Explorer
Jun 11, 2018

Can anyone tell me what this coolant line is for?

I have a 1990 Winnebago Warrior RV built on a Ford E350 van. There are, of course, two bypass lines that come off of the water pump and manifold. Normally, these would route to the heater core. O...
maillemaker's avatar
maillemaker
Explorer
Jun 12, 2018
Is it possible that this line is a pressure relief mechanism for the bypass circuit?

I have blown 2 heater cores in this RV in 10 years. Could this hose be a mechanism to shunt some of the bypass flow back through the radiator instead of through the heater cores?

Steve

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,344 PostsLatest Activity: Dec 26, 2025