these absorbtion refers need 3 things. good heat source, good venting, good leveling. your describing the same symptoms on gas and electric. so, lets assume you got good heat. 2 fans in a slide unit with 4 doors sounds light. ive seen that standard on a 2 door. you need to be level anytime the coach is parked for over .5 hours with it on. leveling doesnt matter traveling. there is a siphon tube like an old style percolator that sits next to the heat source. once that over heats, sodium chromate can crystalize in it and reduce or stop performance, like hardening of the arteries. chunks of sodium chromate can also float in the system and block flow temporarily. such as when you mention working for a while and then issues again. once outside temps get over 100 you will go over 40 in the box. some claim with extra fans, they get a better spread. id probably try some temp fans to check for improvement. go a new core, prolly the amish, or the 110 unit if the fans dont work.
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