NO, it will not damage the vehicle engine by turning the heater ON before the engine has warmed up fully.
If you put petrol in a diesel engine by mistake, the tank must be fully drained before driving as they are incompatible. If this is not done, the vehicle will not run and permanent damage can occur.
On the 2005 GMC Envoy, the block heater is right above the left side engine mount. If you turn your tire's fully to the left you can see the mount right above the motor mount.
A hole in a 5 horse power marine engine cannot readily be fixed due to the high pressures created by combustion. The damage component must be replaced to fully repair the damage.
Make sure the heater switch is turned fully on, before draining the system and also when refilling the system.
Check that the heater valve opens fully, and then take the heater hoses off the at the water pump and flush the heater core with the garden hose in both directions.The problem could also be the thermostat being stuck open, meaning the engine is not reaching its operating temperature, especially if you are in a cold climate.
I think the only damage you can do is unplugging it before it is fully charged
The most likely cause is an 'Air Lock' in your heater matrix, probably caused when you changed the thermostat. There are 2 ways of dealing with this; Run the engine, with the heater temperature setting on cold, when your engine reaches normal running temperature, open the heater valve to full. This can work sometimes. For this second method, you need the engine cold: Remove the hose that connects from your cylinder head to your heater and raise it fully. Pour some coolant mixture into the end of the pipe, until it flows from the pipe connection. Reattach the pipe and secure in place. Your heater should now work normally. If it doesn't, you may need to replace the water valve or flush the heater matrix.
the location for the heater core is found in the interior of the car after the enitre Dashboard is fully removed.
fully comprehensive
No
No.
Not likely, but running the engine with a dead battery can damage some alternators. Always fully charge the battery when installing an alternator.