the gauges? does ur rad cap get hot? cuz to me looks thats the coolant during the heatercore just isn't hot enuff to provide out warmth. so it might be a prob even in ur coolant system, or simply one thing just like a trapped shut tstat.. Reply Like http://rvheaterblowingcoldair27161.blogofchange.com/9761017/about-rv-heater-blowing-cold-air