What are the steps to install a block heater in a 1999 Chevrolet Blazer?
Generally, you need to find a freeze plug that is easy to get
to, remove/destroy the freeze plug and install the block heater.
Before you try to do all of that, make sure you have the right size
freeze plug and everything that you need to install it. Generally,
there is a bolt that tightens the freeze plug into the block. If
you follow the included directions, it's reasonably
straight-forward. If that sounds a little too involved, try an
in-line coolant heater that connects to either a radiator hose or a
heater hose, depending on what you get.