After replacing my upper rad hose and thermostat at the same time, I decided to acid flush my cooling system. Between all of the filling and rinsing I found a good way to fill the system without the need for multiple heating and cooling cycles. I filled the system through the heater return hose instead of the radiator cap. It's high enough that you get a good fill the first time. i just pulled it off the heater core fitting and put a funnel on it. BTW it took about 6 gallons.

Bob,

For the record, in regards to capacity, do you have a 23 or 26 foot coach, and do you have a water heater that uses engine coolant?


Bob de Kruyff wrote on Sat, 02 May 2015 23:59

After replacing my upper rad hose and thermostat at the same time, I decided to acid flush my cooling system. Between all of the filling and rinsing I found a good way to fill the system without the need for multiple heating and cooling cycles. I filled the system through the heater return hose instead of the radiator cap. It's high enough that you get a good fill the first time. i just pulled it off the heater core fitting and put a funnel on it. BTW it took about 6 gallons.

Could also be used to input the acid solution and final fresh antifreeze fill.

http://www.gmcmhphotos.com/photos/g4278-simple-2fno-spill-2fno-air-cooling-system-filler.html

bdub