jkmvv Report post Posted August 13, 2009 Can a coolant overflow tank be added to an older rig and mounted higher than the existing brass expansion tank that is at the top of the radiator? The only place available is a shelf just above and forward of the radiator. If this can be done, what changes need to be made to the cap so coolant will flow in both directions and will the system still be pressurized? The rig is a 1971 motor home that was a factory conversion of a Ward school bus shell. The engine is a 532 cu. in. Ford gas pusher coupled to an Allison 6 speed transmission. Thank you, John Vander Ven Share this post Link to post Share on other sites
wolfe10 Report post Posted August 13, 2009 John, Certainly, you can add a coolant overflow tank. You will need one of fairly large capacity (truck or RV size as opposed to car size) because the large volume of your cooling system means you will have more flow in/out of the overflow reservoir as the coolant temperatures change. And it does not have to be mounted higher than the radiator. Expansion/contraction of coolant and/or any trapped air "move" the coolant into/out of the reservoir-- gravity NOT required. Sure, it is a little better to ADD gravity to the equation, but not necessary. BTW, this is a good idea. I always try to minimize the amount of air/oxygen in the cooling system. ONLY bad things happen when metal and oxygen meet. Brett Wolfe Share this post Link to post Share on other sites
dwightginnyputzke Report post Posted June 9, 2010 John,Certainly, you can add a coolant overflow tank. You will need one of fairly large capacity (truck or RV size as opposed to car size) because the large volume of your cooling system means you will have more flow in/out of the overflow reservoir as the coolant temperatures change. And it does not have to be mounted higher than the radiator. Expansion/contraction of coolant and/or any trapped air "move" the coolant into/out of the reservoir-- gravity NOT required. Sure, it is a little better to ADD gravity to the equation, but not necessary. BTW, this is a good idea. I always try to minimize the amount of air/oxygen in the cooling system. ONLY bad things happen when metal and oxygen meet. Brett Wolfe Share this post Link to post Share on other sites
