first48 - all the heaters use the engine coolant for heat source, none electric [except for the fan], and they bolted to the firewall under the dash .... if you can get a pic up someone could likely ID what you have

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 & Rust-a-holics Unanimous parking lot