2000 Ford F250 Diesel air cond problems

[1965]

My 2001 F350 dsl dually had a canister on left side facing motor near ac box on the firewall the bottom of it had a pinhole that caused a leak so ac didn't come out of vents but defroster only= the canister is about the size of a quart bottle with vacuum lines running to it hope this helps bobby

[FED 387]

Yep know exactly where it is thought about checking that too-- with all the vibration and the age of the truck makes sense the plastic finally gave out ---how did you locate the pin hole what test did you use???

[1965]

Kind of right behind the battery, mine I could see the pin hole , all u have to do when u pull off is pull vacuum or blow air into it, u can by pass the canister with the vacuum hoses to see if cures the problem then search for leak in tank

[FED 387]

OK--so far I have replaced the pump and the reservoir with a known good pump & reservoir--- chased down all the vacuum hoses none appear to be chafed or worn--- how about the control selector on the dash anyway to test it ? or do they just "go bad" looks like its all plastic so no way to take it apart the hose is fastened to the selector not hanging or anything- changing it from any position to another( vent/AC/heat/defrost) changes nothing STILL ONLY DEFROST !!!-- looked under the dash/glovebox area nothing appears out of the ordinary there---any suggestions other than replaceing the selector knob---truck is 2 wheel drive and has AC---thanx FED 387

[Sean Marconette]

Run a vacuum line directly from the pump to the damper actuator. Or buy a hand vacuum pump and do the same. Eliminate each device. But if you start at the actuator and it moves and stays in position it should be ok. The rubber diaphragm may be cracked and is leaking.

Sean

[FED 387]

SEAN-- OK --so where is the diaphragm located??

[Sean Marconette]

It's attached to the blend damper, somewhere under the dash.there could be more than one actuator. Looks like this.

http://www.oreillyauto.com/site/c/de...+door+actuator

[FED 387]

OK got it will check that out too--thanx FED 387

[Sean Marconette]

This is for reference only as it is for a Ranger, but a picture is worth a 1000 words.

http://www.ford-trucks.com/forums/at...ntid=517&stc=1

[FED 387]

OK Sean--- how do you know wether its a good one or a bad one? by using a hand actuated pump its supposed to move correct if it doesnt move its bad right---these things are a little pricey dont want to buy a 1/2 dozen til I hit the right one!!! --Thanx FED 387