2000 Ford F250 Diesel air cond problems

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

Johnny U · 08-22-2014, 03:01 PM

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.

FED 387 · 08-22-2014, 04:22 PM

TWO WHEEL drive !!!

FED 387 · 09-03-2014, 01:44 PM

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

08-19-2014, 08:58 PM	#1
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 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	#2
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 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	#3
Sean Marconette Senior Member Join Date: Mar 2006 Posts: 977 Likes: 797 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	#4
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 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

08-22-2014, 03:01 PM	#5
Johnny U Junior Member Join Date: Jul 2006 Location: Oakville Ontario Canada Posts: 55 Likes: 0 Liked 0 Times in 0 Posts	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.

08-22-2014, 04:22 PM	#6
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 Liked 333 Times in 180 Posts	Re: 2000 Ford F250 Diesel air cond problems TWO WHEEL drive !!!

09-03-2014, 01:44 PM	#7
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,422 Likes: 532 Liked 333 Times in 180 Posts	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