Power loss Jeep

[Fifty]

:D
Hi
colleague has a 2.6 l P reg Cherokee Diesel; he has problem with power loss through all gears at 2000 rpm but only when the heater or aircon is ON; turn em off and runs fine.

Anyone any ideas?
Rich:)

[stt]

Possiblity the alternators knackered

[Fifty]

Thanks for reply m8
hes going to check that out
Rich:d