Rearheater window keeps blowing fuses after a couple of goes

you may have a short (verify the integrity of the insulation of the positive wire from that fuse going to the rear window defroster, check the relay & switch.) try to replace the relay.

The fuse goes to the auto shutdown relay from there it goes to two powertrain control modules. Test the relay or replace or there is a short in the system

I have a 2004 Sorento EX and my EXT fuse along with the stop lamp fuse kept blowing. The ext would blow as soon as I turned the vehicle on. The stop lamp would blow after a couple pushes of the brake pedal causeing me to have no rear lights at all regarding brake and the lights that you turn on at night. After much reading online in forums such as this, I was led on a chase looking for grounding wires, broken wires, dirty battery terminals, faulty altinator, and for a drl module. I could not find a drl module as I now do not believe there is one in sorentos, or at least in mine. I then came to the brake switch that is located on the arm of the brake pedal. I disconnected it, put a couple of new fuses in, started my vehicle and checked my fuses, and at last they did not blow! I reconnected the brake switch and checked the fuses and they had blown. I have a hunch that I am dealing with a faulty brake switch. Hope this helps

change the central locking relay.

If a fuse keeps on blowing there are broken wires or a short in the circut controling them.

Are you replacing it with the correct amp fuse? Buy a couple of the RIGHT fuses and try this.Your wiper motor may be bad, or the wiper mechanism is binding, causing the motor to over amp and blow the fuse. Try lubricating, if you get to it, the arm mechanism, and make sure it is not hitting anything while it is in motoion. Not familiar with this cars set up. Remove wiper blades, or stand them up and see if it still blows tyhe fuse

There is a special tool for removing the cigarette lighter.Usually only the dealers and tool guys will have this tool.If you remove the element you will see 2 slots across from each other.The tool goes into these slots and the lighter pulls out.What you can do is disconnect the cigarette lighter and if the fuse does not blow then you know for sure the element is the problem.See if you can insert something in the slots to disengage the lighter assembly and try to remove it.Hope this helps.Good luck.

Replace the wire. It is shorting to ground, causing the fuse to blow.

Not enough information. You really need to have it diagnosed to find out if its an engine issue or component. You may have a couple different problems but only a shop can figure it out. Here we are all just guessing.

U HAVE A LARGE SHORT IN THE WINDOW HARNESS OR THE WINDOW MOTOR, START BU DISCONNECTING THE WINDOW MOTOR AND SEE IF THE SHORT GOES AWAY, IF IT DOES THEN REPLACE THE WINDOW MOTOR.