Hi I have a bit of a problem which is confusing me my crd 2003 over heats when I use the air con, any body got any ideas

May be a bad thermostat. Try going on a hilly road and under a heavier acceleration but with no ac. It it overheats again its the thermostat. If the outside temp is 70+ (22+ Celsius) and your thermostat is stuck on semi-open, it will overheat. I had a similar issue one of last summers couple years ago when the engine warmed up pretty quickly (to 1/2 on the gauge) engine didn't overheat unless going uphill for a long time. If that won't work, I'd check the ac for some restrictions.

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

Thank you. the temp here at times has been mid 30c to 40c near on 90+f soon as i turn air con off its ok but I get cooked then lol

Mine would overheat on a steep hill when I bought it. A bad OEM fan clutch was the cause.

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'05 Sport CRD 107k miles. NOBODY knows everything.