2000 Ford F250 Diesel air cond problems

FED 387 · 08-19-2014, 01:56 PM

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

1299 · 08-19-2014, 08:45 PM

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

FED 387 · 08-19-2014, 08:58 PM

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

FED 387 · 08-20-2014, 11:44 AM

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

Sean Marconette · 08-20-2014, 01:28 PM

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

FED 387 · 08-20-2014, 01:33 PM

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

08-19-2014, 01:56 PM	#1
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,421 Likes: 529 Liked 333 Times in 180 Posts	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

08-19-2014, 08:45 PM	#2
1299 Member Join Date: Aug 2009 Location: howell,nj Posts: 125 Likes: 313 Liked 54 Times in 12 Posts	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.

08-19-2014, 08:58 PM	#3
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,421 Likes: 529 Liked 333 Times in 180 Posts	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

08-20-2014, 11:44 AM	#4
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,421 Likes: 529 Liked 333 Times in 180 Posts	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

08-20-2014, 01:28 PM	#5
Sean Marconette Senior Member Join Date: Mar 2006 Posts: 977 Likes: 796 Liked 275 Times in 76 Posts	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 __________________ Sean Marconette 84 Mustang 5060 SS/N Last edited by Sean Marconette; 08-20-2014 at 01:32 PM.

08-20-2014, 01:33 PM	#6
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,421 Likes: 529 Liked 333 Times in 180 Posts	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