Why does my #11 fuse keep blowing on my 04 Discovery

fuse blows means the load on that fuse is shorted out.
AKA.( POWER FEED OVERLOADED)<<< PHYSICS
the service manual shows all thingS connected to any fuse
the scan tool must be used, to find all DTC even ABS
the brakes most be good or ABS has no chance to work.

no year car told
nor country sold to (VIN)
first td5 is 1998. with ABS THEN,. AND ENDED 2007 .td5 only.
NO DISCOVERY HERE USA SO NO BOOKS ON IT
3 Generations there are , series II 1998 first. and with ABS.
mot fails in generic parlance is SMOG tests fails, that every one understands.
sure fail how can it not with all that bad.

next time post full name of fuses and its exact location and slot..
the others in EUROPE:? can help tell you what is connected to that fuse. and Amps of fuse blown.

and why skip year , seen in the VIN tag etc?
year of mfg.

A fuse blows when the current in the circuit exceeds its capacity. Your best bet is to get a hold of the schematic and look at all of the devices within the circuit for fuse 11.

Items not in that loop will not be responsible for the anomaly so do not waste time.

Hi Aaron, I'm glad to help!

Aaron, anytime a fuse blows in any circuit its because that CIRCUIT has a dead short to ground somewhere in that circuit. You need to find out everything that fuse 11 goes too. Once you know all the components that circuit 11 goes to you'll need to unplug one component at a time until the fuse does not blow and replace that component (PART). NOTE: If after checking each part one at a time and the fuse still blows, then its time to check the wiring going to each individual component because it is shorting out somewhere against a metal object. Hope this helps and have an awesome day Aaron.

As per your problem mentioned.There are few solved help links to troubleshoot these problems.Go through the list and Click the link below:----
Air conditioner blows air but not cold air http://repairhelpcenter.blogspot.in/2012/07/air-conditioner-blows-air-but-not-cold.html

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Car overheats and Air blows hot at idle? http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html---------- Hot air on the driver's side vents only? http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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2005 Chrysler PT Cruiser: A/C Blows Warm? http://whoisbyme.blogspot.in/2012/06/2005-chrysler-pt-cruiser-ac-blows-warm.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold? http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold? http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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These will help.
Thanks.

According to my diagram, number 11 is a 10amp fuse that powers the ac clutch relay. I don't see how it would keep the engine from starting.
Is the fuse you are talking about in the engine compartment box and is it a 10amp ?

Does this happen when you turn the ignition to the 1st position or when you try to start the engine? If its when you try and start the engine then check the starter relay.

I WOULD CHECK FUSE AND RELAY.IF THEY ARE GOOD.I WOULD REMOVE HORN.HOT WIRE IT.IF IT BLOWS.YOU HAVE GROUND PROBLEM OR YOUR HORN BUTTON CONTACTS IS BAD.

I believe the problem is the origion of the vehicle.

Look at the wires behind your marker light, especially at the back where there are more stones hitting. You probably have a bare wire or two.

there's a grounded wiring on it that's why it keep on blowing your fuse check the wiring.