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When the battery voltage is low the computers do not have enough voltage to run properly so they go to a default mode. This mode includes running the fan on high to protect the engine as the computer does not know what the temperature is.
There is a body ground under the battery tray that may be loose and causing your battery issues. If you make lots of short trips that will shorten the life of the battery, a battery with as many Cold Cranking Amps (CCA) should be installed. The original spec of 550 CCA is marginal, if you can get a MegaTron from Interstate with 800 CCA then it may solve the problem.
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This ground is a stud that it welded to the body just below the battery tray, looseness, burning or corrosion would be what to look for here. It will be obvious if this is a problem.
Is there a possibility that you don't drive the car enough to keep the battery charged? This would be a greater concern than a poor ground.
Certainly if there is one of the computers not going to sleep it will discharge the battery. If the ground is loose this will happen. I found this on a brand new car once and it showed this same pattern.
If they are starting the car a dozen times a day without driving it the OEM battery is not up to this. A lot of current is used each time the engine is started then you need to run for at least 20 minutes to put all that current back in the battery with the alternator.
I would replace the battery with one of the same physical size and the most CCAs available and while the battery is out check the ground stud under the battery tray for any signs of looseness, corrosion or burning.
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Hello, sorry for the delay, I was out with my family.
The radiator fan fuses are #10, #20 and #24 in the diagram of the underhood fuse block.
I hope this reaches you in time
Click here for diagram
Yes the arrow in the picture points to the fuse block. Use the numbering on the diagram to guide you to the correct fuse for the low and high speed fans, the third number is XXXXX the fan module. YOu may not have a F20 but you should have the F24 and F10.
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The label in the box and the diagram numbering are different.
What position was 37 in compared to the diagram? YOu notice there are only 30 fuses positions shown in the diagram?
Glad you got it stopped, you should check that you can still start the engine as you may have disrupted the immobilizer system.
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2003 Jetta left rear window blue plastic part of the