A heater bypass is not an original equipment item. you would install it to keep coolant from circulating through the heater core, mostly when it is leaking.
The Pontiac G6 block heater is located on the right hand side of the engine. The block heater can be located by following the block heater cord.
I can't find my block heater plug on my pontiac G6 2006,,,Where is it? Maybe it does not have a block heater.
The 2001 Pontiac Montana block heater cable can be found in the front of the vehicle. You can access the block heater cable through the front grill.
the frost plugs are in the block and head. if you have a block heater follow the cord to the block heater, it replaces a frost plug. that should give you an idea where they should be located
It goes into the water pump. You remove a plug and screw in the block heater. Between the engine and the firewall. You can get at it from underneath.
It is an option and you might not have it if you can't find it
You can get a heater that magnetically sticks to the pan and warms the engine. You can get a heater that connects to the heater hose and circulates warm engine coolant. You can also get a block heater that replaces a freeze plug. You have to decide which works best for you.
If there is a block heater installed then there should be a plug at the hood/lights or bottom of engine.
I had one and kept it in the trunk until it was needed
Easiest is to plug in the block heater cord with the hood open. Follow the cord to where the block heater is located and you should hear a gurgling sound similar to an electric kettle. If you don't check your power source. If you can reach the block heater unplug the cord from it and check the power at the end that plugs into the heater with a 2 prong tester to make sure it's not the cord causing the problem.
The water pump pushes the coolant through the engine block and head(s) then into the heater core.
The Toyota Camry block heater is located on the front of the engine block. You can follow the block heater cord to the block heater.