Antifreeze in Fleetwood Pusher

Blaster Man wrote:

This avoids situations where the manual says your capacity is 9 gallons, so you drain it and add 4 1/2 gallons of undiluted coolant. Then you fill it with water, but the radiator is full at 3 gallons of water. Now you have a mess which is a pain to get to the correct 50/50 mix, BTDT.

Actually, if the last rinse with distilled water-- therefore the residual water in heater hoses, heater core, bottom of engine block, etc is distilled water, you really don't (or shouldn't) care how much water you added.

Example: 10 gallon cooling system capacity. Residual distilled water after last drain 3 gallons (this is the unknown). Add 5 gallons coolant concentrate. If indeed you had 3 gallons of residual distilled water, then you can only put in 2 gallons to top off radiator. If there was only one gallon of residual water (unlikely) you would add 4 gallons.

The ONLY caveat is that you know total cooling system capacity. And your chassis maker is the proper source in the vast majority of cases. Yes, I guess a coach maker could decide to buy without heater core, and install their own, but that is really unlikely.

If this method still bothers you, you can certainly spend the time to insure that the whole cooling system is drained-- which means taking hoses loose and using compressed air to blow out the residual water and then add the 50/50 pre-dilute. Nothing wrong with this.