The block heater is a simple device, and usually needs to be replaced in total, it is just a heating element which goes into the block cooling system, to keep the coolant from freezing. Can you fix it yourself? I could, so I assume you could, but do you really want to have your daily driver torn down while you are learning to 'fix it'?? I rec that you get a pro to do this fix, stick to filter and oil changes unless you know what you are doing...
The block heater is a simple device, and usually needs to be replaced in total, it is just a heating element which goes into the block cooling system, to keep the coolant from freezing. Can you fix it yourself? I could, so I assume you could, but do you really want to have your daily driver torn down while you are learning to 'fix it'?? I rec that you get a pro to do this fix, stick to filter and oil changes unless you know what you are doing...