Recently my blower has been stuck on defrost/floor no matter what position you have it on I have no idea where to begin to look.

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Silver 05 sport crd-Ehm,Orm,wix oversized oilfilter,shell rotell,2nd gen fuelhead,Fumoto oil drain valve,muffler delete,cat removed,V6 airbox swap,evic added,HVAC controls modded, Franken lifted II,hercules Terra Tracs 245/75/16,Full l.e.d. interior swap,hayden fan clutch and nylon fan

Most likely a problem with a vacuum line to the actuator. This was discussed recently. Search the forum or check the service manual.

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05 CRD Limited
GDE Hot Tune
Samco CAC Hoses
OME 790 and Bilstein 916 up front
OME 948 and OME N132L in rear
245/75/16 Treadwright Warden A/T on Richard Cepek DC-2
Euro torque converter
Renegade roof lights
Pioneer Z110bt double din navi w/ reverse cam

See the FSM section dealing with the mode door actuators (begins pg 24-14 in 06 FSM and 24-31 in the 05 FSM). Looks to me like you can access these fairly easily. Problem could be leaky of disconnected vacuum hose or stuck/bad actuator.

FSMs are avaiable via Sam's NOOB guide. Get both 05 and 06 - 05 lacks diagnostic and diesel cooling system info but has illustration keys while 06 is the reverse.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Fixed I was installing lights the courtesy lights on the driver side and I noticed 2 vac lines came off no idea how but it's fine now

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Silver 05 sport crd-Ehm,Orm,wix oversized oilfilter,shell rotell,2nd gen fuelhead,Fumoto oil drain valve,muffler delete,cat removed,V6 airbox swap,evic added,HVAC controls modded, Franken lifted II,hercules Terra Tracs 245/75/16,Full l.e.d. interior swap,hayden fan clutch and nylon fan