I have been thinking of changing the antifreeze out on our Barth we bought in May. I do not know when the last time it has been changed and am wondering the procedure of getting all the lines that run thru the coach drained and then the air purged out again when you fill it. This is a 91 regency with a Cat 3208TA. So it has the heater up front in the dash, a heater in the rear bedroom area, and a water compartment heater also, and the lines that run to the water heater. Any help on speeding up my learning curve on this would be great!

There is a standard faucet drain at the front dash heater unit. It is mounted against the firewall. My 93 also has a drain at the water heater in the compartment where the 12v ump is located. The others should drain if you open the lowest point of the radiator system which is the coolant filter on the drivers side of the engine behind the side mounted radiator.

Thanks Tom,
I have seen the valve on the firewall, but have not seen one near the pump or water heater. There is one near the engine, between the engine and side mounted radiator, and is high near the valve cover. I guess I need to start following lines and see what I can find.
Jerry