heaters are in the 57 accessories installation manual, but there's no place that shows construction/repairs .... specifics depend on which heater you have, but you need to remove the heater from the truck and disassemble the case, all of which should be pretty obvious after consulting that manual .... maybe some help on the deluxe version in the heaters album linked below

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics