I have I think a cracked head on my 2003 kia sorento I'm trying to find a brochure or diagram on how to disassmble a head

Removal & Installation

1. Before servicing the vehicle, refer to the precautions at the beginning of this section.
2. Drain the cooling system.
3. Relieve the fuel system pressure.
4. Disconnect the negative battery cable.
5. Disconnect the upper radiator hose.
6. Remove the breather hose and air-intake hose.
7. Remove the vacuum hose, fuel hose and coolant hose.
8. Remove the intake manifold.
9. Remove the cables from the spark plugs. The cables should be removed holding the boot portion.
10. Remove the ignition coil.
11. Remove the upper and lower timing belt cover.
12. Remove the timing belt and camshaft sprockets.
13. Remove the heat protector and exhaust manifold assembly.
14. Remove the coolant pump pulley and head cover.
15. Remove the intake and exhaust camshaft.

1. Remove the cylinder head assembly. The cylinder head bolts should be removed using the 12 mm socket, in two or three steps. Clean the gasket pieces from the cylinder block top surface and cylinder bottom surface.

Im sorry to tell you this but you cant realy fix a cracked head,, only to replace it with another one,,
you will neet to remove the complet head so if i were you i would get a work shop manual for your car and read up on it first,,, for a start its not an easy job you will need a lot of tools to do the work with and if your a "lay person" without a lot of experience it would be far better to drop it into a shop for repair you may just have a blown head gasket insted but it still means the heads got to come off to fix that as well,,,
the shop would be a lot cheeper that buying all the tools you would need to do this job, think about this bit first