it was there as the temperature sensor for "automatic" temperature control - I think GM figured out it was redundant as they eliminated it by the end of the TF series, using the 'temp' lever alone and counting on a stable coolant temp controlled by the engine thermostat

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