This is not my coolant temp is too low.

I have a question off the dash functioning off the crd jeep liberty?

First some info for all it 2005 jeep liberty crd the fan switch works in all 4 settings the temp control works hot and cold the a/c works also but i cannot change the location off the air discharge it is stuck on defrost only ? In the 3.7 liberty it looks to be a vacuum actuated setting with the crd not having vacuum. I am doing a little brain storming on what i should look for or might expect to find. Is it electric servo motor , is it pressure actuated, has this happened to others ??


Thank You
Ken

Go to the main CRD page to the sticky toward the top for Sir Sam's NOOB guide and in the 1st post, good to read it all, scroll down to the link to manuals. Go to that link and get copies of BOTH the 2005 and 2006 manuals; 2005 lacks diesel cooling data/has illustration keys; lacks diagnostic codes and steps while 2006 is reverse. Take a look at Section 24 dealing with HVAC controls. It appears that there is no difference between CRD and gasser. There is a vacuum operated mode door control (I think this is what controls the direction of airflow) and an electrically operated blend door control (I think this controls the amount of heat/cool). Assuming your control knob for air flow moves but the flow of air does not change from defrost to other directions it sounds like 1) vacuum control module has failed; 2) vacuum to the contol has failed; 3) link to other doors has failed; 4) doors are stuck; or ???. Last time this happened to me, decades ago on a Plymouth product, it was the vacuum control module.

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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

Will do again I stopped last time from the standpoint off most turbo diesels do not produce vacuum from the intake manifold so i thought it was a copy and paste from the 3.7 gas model.
Thank you

Could be as the FSMs have been known to be inaccurate and no I don't have a clue where the diesel vacuum would be pulled. Mines 250 miles away right now so I cannot even look to see if power brakes have a vacuum boost; but since they slowly get hard when used just after the engine is shut down I suspect they do as that matches vacuum loss not electric power loss.

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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

I poked my head under the hood yes there appears to be a pressure assisted brake booster? most likely vacuum? It drizzly and raining here so wont be pulling much apart. The service manual does state that the brake pressure booster gets it vacuum from the intake manifold (I am still baffled how there is a vacuum pressure at idle and completely dumbfounded how there is a vacuum at driving rpm with turbo spooled up) I will be doing more searching under the dash to see if there is a bad linkage or loose pressure (vacuum) hose. The manual does say if there is no signal to the selector switch black port it will stay in defrost location normally so i may have a bad pressure control manifold or no pressure at the manifold or bad actuator more info to follow

Thank you again

Diesel automobile engines have vacuum pumps and our CRD's are no different. Vacuum is also used for your brakes. . They have had them since the first VW rabbits and still do on the latest TDI's.
Then check the vacuum hoses on the pasenger side under the hood. Just like a gasser

As papa said read the fsm

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Atlantic Blue 06 CRD Limited (his)
Joined by a 2000 XJ Classic (hers)

Thank you Joe the knowledge off there is a vacuum pump this is good to know. The FSM say nothing off it in relation to brakes or heating system. It states the intake manifold is the source of vacuum for both. This caused me to think the FSM was for the 3.7 or at very least was missing info. With the knowledge off the pump and now knowledge that we do use vacuum pressure to assist the brakes i can narrow my search too a bad manifold control switch or bad vacuum actuator / diaphragm as the brakes are working fine. So it is not the vacuum pump. More likely it will be a small hose or actuator problem under the dashboard or on the engine side off firewall.


Thank you Joe and papa for all your help


p.s. I was worried if bye some way the vacuum source was the intake manifold thru maybe a velocity pump or god know what. That like every other sensor or device I have taken out off the intake system it would be clogged with black gook caused bye our lovely government regulations .