99 XJ8 codes/part help

Started By: on 2016-02-22 00:00:00

My XJ8 base model 4.0L DOHC is in need to find out what parts I need to take care of following codes. It had been an ongoing thing for about 8 months and this time it has happened within two days. Any help would be greatly appreciated in determining the fix for it.

Code B1858 Climate control pressure switch/circuit failed
Code B1948 Climate control water temperature sensor/ circuit failure
Code B1238 Over Temperature

Is this part of the climate control computer, or part of a fuse block?

Thanks