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Old 06-28-2016, 08:16 AM   #15
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Join Date: May 2012
Posts: 19
Coolant Filter Installation

This is a great write up. Your installation looks very professional like it would look if one had been installed at the factory. I wasn't aware that the filter only passed a couple gallons a minute. That would be enough I think to provide some filtration. The heater would suffer maybe in performance but we don't travel that much in winter. The photo I attached shows my heater hose arrangement with I assume the heater feed line (red) controlled by a shut off valve and the black return line. I have a steel bulkhead running horizontally and can drill and install the filter head to the right of the lines and router shorter lines from it over to the heater hoses. I do think it necessary to install a check valve (in line fitting) to keep the hot coolant from back feeding into the heater core thus making the heater "active" all the time. These are available on eBay as well for around $15 bucks and not much pressure is required to OPEN them in the desired direction of flow. My filter then would be just above the genset very convenient to get to and change filters. I assume you pre-fill your new filter before installing to prevent coolant loss contained in the old filter? Much like filling an oil filter prior to installing?
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Old 06-28-2016, 08:02 PM   #16
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Posts: 153
I just pinch the line and spin the filter on dry. I don't see any reason to pre fill it. I don't think the little bit or air would be any issue. It would get air in it when you change the coolant out also. Not sure why people keep writing that the coolant filters don't filter anything. The ADDITVE CANISTERS do not filter, just slowly release additives. A coolant filter is just that, a filter. The one I listed is a 40 micron to be exact. I think your idea will work and be easy to get to. Definetly be more difficult on your coach to put it in the back because there is no factory provision for the coolant filter. If you have a motoraid water heater system on your coach you could use that line also. At 2 gallons per minute theoretically all of the coolant in my system is filtered in 6 minutes. Now I think it would be a lot longer because not all the coolant is going directly through the filter, most will bypass it but will eventually get through the filter.

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