2000 Ford F250 Diesel air cond problems - Page 3

Sean Marconette · 09-11-2014, 06:59 PM

With pneumatic actuators we apply pressure, and with a pressure above what is above the actuators spring pressure it will move. In this case its vacuum, but the same principal. With the 17-21" w.c. rating of the vacuum pump, the actuator should stroke to the full position, and remain there. With what you are describing chances are if you apply 17-21" of vacuum directly to the actuator, if it moves and stays fully stroked, it is fine. Work backwards from there until you find what is damaged or unhooked. It could be as simple as the vacuum line is disconnected or cracked at the actuator.

Sean

FED 387 · 09-11-2014, 08:33 PM

Sean-- thanx got my Sat AM all set up for doing this--Regards FED 387

FED 387 · 09-17-2014, 04:34 PM

OK --found it!!!! the insulatution they put around the battery over time had worn a TINY !!!!!! pin hole in the seam of the vacuum reservoir cannister--- even under water it rarely bubbled--- so I siliconed it for now but I have a BRAND NEW cannister coming--- the one we used that we thought was good had an even smaller leak but it did leak---

Thanx to all that rfesponded--- FED 387

09-11-2014, 06:59 PM	#21
Sean Marconette Senior Member Join Date: Mar 2006 Posts: 976 Likes: 780 Liked 274 Times in 76 Posts	Re: 2000 Ford F250 Diesel air cond problems With pneumatic actuators we apply pressure, and with a pressure above what is above the actuators spring pressure it will move. In this case its vacuum, but the same principal. With the 17-21" w.c. rating of the vacuum pump, the actuator should stroke to the full position, and remain there. With what you are describing chances are if you apply 17-21" of vacuum directly to the actuator, if it moves and stays fully stroked, it is fine. Work backwards from there until you find what is damaged or unhooked. It could be as simple as the vacuum line is disconnected or cracked at the actuator. Sean __________________ Sean Marconette 84 Mustang 5060 SS/N

09-11-2014, 08:33 PM	#22
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,399 Likes: 482 Liked 320 Times in 172 Posts	Re: 2000 Ford F250 Diesel air cond problems Sean-- thanx got my Sat AM all set up for doing this--Regards FED 387

09-17-2014, 04:34 PM	#23
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,399 Likes: 482 Liked 320 Times in 172 Posts	Re: 2000 Ford F250 Diesel air cond problems OK --found it!!!! the insulatution they put around the battery over time had worn a TINY !!!!!! pin hole in the seam of the vacuum reservoir cannister--- even under water it rarely bubbled--- so I siliconed it for now but I have a BRAND NEW cannister coming--- the one we used that we thought was good had an even smaller leak but it did leak--- Thanx to all that rfesponded--- FED 387