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You have to take half the car apart to replace the heater core
The entire dash assembly must be removed to gain access to the heater core.
where does the engine block heater go in my 2007 ford focus
Sounds like either the fan speed switch or the fan motor itself might be bad.
Most likely the door jamp switch is bad. You will need to replace it.
Before you begin to focus on the the fan itself, have you checked the fuse that controls the fan to see if it's burned out? It might also be that the fan switch is bad.
The brake light switch might not be connected properly. Remove the brake light switch for 10 seconds and replace it to its original position.
You can not replace it unless it's an old ford focus.
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Take it to an auto body shop. They can switch it out in minutes. Don't buy into rhetoric on how hard a job it is. It ISN'T!