Buick 1993 Roadmaster Owner's Manual page 79

Engine Block Heater (Canada Only)
In very cold weather, '0
O F
(- 18 C) or colder,. the engine
.
,
block heater can help. You'll get easier starting and
better. fuel economy during engine warm-up.
To
use the block heater:
1. Turn off the engine.
2. Open the hood and'unwrap the electrical cord.
3. Plug
it into a normal, grounded
110 volt outlet.
L
77