Yeah, before you say it isn't needed there are folks who actually use this to warm their car up in the mornings while we dress up for work (no need for key in ignition)
With that said, I have one installed. I bought the car 2nd hand with it and it only works sometimes. Mostly, when the car is being driven very gently on its way home.
Any idea why this might be so?
What logic sequence could this device be following?