fridge cooling problem Dometic DM2852

Fridge is in a slide. Yes auto temp no controls. I checked the fan with a heat gun should have come on about 130 - 135 deg. wasn't working. Check current at the fans thermostat 1.3v. Bad 3v fuse. replaced with 5v fuse all I had handy. Power good tried heat gun again and fan spun for moment then quit. Connected to 12v power fan no good. Replaced with dual fans 40cfm each works at 130 deg. So left 5v fuse in. I'm sure the cooling system is ok. Ill try a new thermisor and see if that does the trick. Now as far as properly installed looks good but I don't install these things so I really have no clue? From the outside wall of the slide there is about 10.5" to the back of the unit. That's just to the back of fridge. Control board gas lines and boiler take up half of that clearance. 2.5" of clearance on both sides insulated with pink fiber glass. 3" inch's of clearance on top no insulation. Two standard size air vent one on bottom one at the top where freezer and condenser are. The fans are located on the back of fridge blowing up to the condenser. There looks to be one baffle just above the lower air vent that blocks 3/4's of the opening. The trailer is level and the fridge is level too just throwing that out! haha!