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Great information. Thank you for taking the time to post it up. One question, why the AC

Agree. Can you move it to the mods forum for me?

YES! Please. I never understood the TDM from a fording standpoint as would think it might be difficult to 'time' the entry into water and may not be able to 'stomp' the accelerator to activate very easily I also like the idea of getting rid of another failure point. Also does it matter...

I did not know this.........I always assumed it could only fail closed. Thank you.

If the thermoswitch fails.......the failsafe is to de-energize the circuit and ENABLE the fan. That's my understanding about it's design, ie if any sensor/wiring fails it results in de-energizing the valve and thereby enabling the fan. Maybe I'm misunderstanding what the word 'fail' means or...

I think you meant if the thermoswitch fails it will still provide power and will ENABLE fan not disable. Correct me if wrong as I need to understand this circuit.

Great suggestion! Love that. Just have to remember to turn it back 'on' or 'auto' and not accidentally leave it off.

My question ...... can a switch be placed that can control this?? Where and how would you splice in the 24V to disengage the solenoid/fan? The fan engages via the cadillac solenoid when it does NOT get 24V ....... by default if there is a fault/failure in sensor, the lack of 24V engages the...