2005 13 footer, the Dometic RM2193 installed doesn't have a visible thermistor. Nor can I see a penetration through the back wall that might allow wire access to feed a thermistor. I've been running it on propane, and everything works as it should I guess, but I have no way of adjusting the cooling other than running outside and adjusting the propane flow at the ignition panel. Before I start unscrewing the cooling fins inside the refer, are any of you missing a thermistor? FWIW, the parts diagrams at Dometic don't show one for that model.