2001 4.0L heater codes and seat prob

[mcmental]

hi i have looked through the pages but i cant find what codes mean
i get 22+56 and its drivers side thats cold but other day it came warm but went off again
i am in the UK (if it makes any difference)
also drivers seat doesnt get any where as hot as passenger seat does any ideas?
also any diagrams for repairing the heater bits cheers in advance
email
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once again thanx