2000 Ford F250 Diesel air cond problems
 

Just started todaynever have had a problem ever--heat/ac/fresh air all work -Air Cond and heat or vent ONLY come out of the DEFROST ducts not the floor or dash vents---checked pump it hums (maybe running but no vacuum is it bad?)checked hoses all seem to be connected under dash by glove box as well as engine compartment no loose hoses-- truck DOES NOT have Electronic air cond it has manual AC is there any ideas any one has?? Thanx FED 387

Re: 2000 Ford F250 Diesel air cond problms
 

ck for vac on the black hose coming in the cab. if no vac there ck the pump for vac.

Re: 2000 Ford F250 Diesel air cond problems
 

that makes sense kinda what I was thinking---No problem with heat or cold when the temp is adjusted it gets hot & cold--I never paid any attention to the pump before does it kinda vibrate a little while running ? or what--It definitely IS running just not sure if its making vacuum---any way to test it and how much vacuum is normal?? thanx for the reply

Re: 2000 Ford F250 Diesel air cond problems
 

checked the hose nothing real apparent ---the pump was running while the engine was running ---how long is the pump supposed to run??---how much vacuum is this pump supposed to pull-- might just be a "worn out" pump hell its 15 years old-- just do not want to spend $45-60 bucks for a pump when its "only" a cracked leaking hose

Re: 2000 Ford F250 Diesel air cond problems
 

The search I found stated the vacuum pump should produce 17-21" of vacuum. If the damper is in defrost is also a sign of not enough vacuum. A cheap hand operated vacuum pump will diagnose a bad hose or damper diaphragm, and could be used to show what the vacuum pump is pulling. What is the brake pedal like?

Sean

Re: 2000 Ford F250 Diesel air cond problems
 

thanx guys--we are gonna replace the pump tonite with a known good pump see if that fixes it---all the hoses look pliable not rotted or chafed etc. Will let u know what it was--FED 387

Re: 2000 Ford F250 Diesel air cond problems
 

Is the truck a 4x4? If it is and it has the electronic shift on the fly (esof) it probably has bad hub seals which allow dirt to enter the vacuum lines and wear out the pump. Like Sean said it should be at least 15" of vacuum. Hope this helps.

Re: 2000 Ford F250 Diesel air cond problems
 

TWO WHEEL drive !!!

Re: 2000 Ford F250 Diesel air cond problems
 

OK finally got around to replacing the pump with a known good pump--- still sameo sameo still defrost only---pulled the glove box out looked under there nothing looks bad---possibly the "selector" is bsd???---without tearing the whole dash apart anyone got any other suggestions?? Thanx FED 387

Re: 2000 Ford F250 Diesel air cond problems
 

I just checked and the A/C compressor is also engaged in any position except off-- not matter which position the selector is in EXCEPT off the a/c compressor is running