Acura TL 2004
Had engine block heater installed a few days ago.
Wanted to give it a test - 30F today I pluged in for an hour or so and
started car.
But temp needle was at bottom, idled for about 30 secs - no change.

Turned heat on - no difference I could tell than w/o the heater.

Isn't the needle supposed to NOT be at the bottom ?
Basically I could tell no difference. This sounds right ?