Jimmy I know this is kinda late reply but I do also have a Primus heat system and I found two resevoirs about a quart in size each for the two units. They are located above the radiator on the right side behind a locked door! Open the door and inside you will see the resevoirs with caps on top. Mines was 25% full so I added to about 75% flow with 50-50 water and antifreeze. I imagine as the fluid gets hot you will need room for expansion. Only found this because my rear 2490 Primus is acting up with wanting to stay on when it wants otherwise the red light in that triangle lights up meaning I have a problem of some sort i am trying to identify! Hope this might help. Rob
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