vacuum reservoir?

[Clusterpup]

Do our trucks have a vacuum reservoir? I am trying to find it in my truck and don't see it. When I press the gas in my truck while driving the AC starts blowing out of the defroster. I haven't found a leak other then the one next to the PCV valve that I replaced a while back. Is there a check valve or something I should be looking for? My truck is 4x4.

 

[John_Rock]

Do our trucks have a vacuum reservoir? I am trying to find it in my truck and don't see it. When I press the gas in my truck while driving the AC starts blowing out of the defroster. I haven't found a leak other then the one next to the PCV valve that I replaced a while back. Is there a check valve or something I should be looking for? My truck is 4x4.

Mine is in the front passenger side under the airbox location. It's an orb.

 

[Clusterpup]

Thanks John, I am going to take a look under there a little better this weekend and try to find my leak. I need my AC working as good as it can now that summer is here.

 

[Clusterpup]

Well I found the thing and noticed that it isnt conected. I noticed that there is a gray and a black vacuum line that are connected together close the the back of the air filter. One seems to got to the intake while the other may go into the firewall. I am wondering if these are supposed to be connect the the resevoir? It only has one connection point? I was thinking if I remove the little connector from these two vac lines and put a t connector and run a vac line down to the resevoir maybe this would fix my low vacuum issue on acceleration.

 

[ncranchero]

Does the Emission label not show your vacuum routing? My ST's are not here right now for me to look at.

edit: Ahhh, here you go.........

Item Part Number Description
1 18A318 Vacuum control motor—panel/defrost door
2 18A478 Panel/defrost door (full vacuum position)
3 — Defrost airflow
4 — Side window demister airflow
5 18B545 Temperature blend door (full heat position)
6 19860 A/C evaporator core
7 19A813 Recirculation air duct door (full vacuum position)
8 — Outside air inlet
9 18A318 Vacuum control motor—air inlet door
10 — Recirculated air inlet
11 19805 Blower motor
12 19A566 Vacuum reservoir tank
13 — Vacuum from the engine intake manifold
14 19B888 Function selector switch
15 18495 Heater control valve
16 18476 Heater core
17 18A559 Panel/floor door (full vacuum position)
18 — Floor airflow
19 18A318 Vacuum control motor—panel/floor door
20 — Panel airflow

NOTE: The two vacuum lines to the vacuum reservoir tank are not interchangeable. NOTE: The A/C vacuum check valve is internal to the vacuum reservoir tank and cannot be serviced separately. ( The check valve should be in the side that Line 13 attaches to. )

 

[techieman33]

Yeah that's the line that goes to the orb

 

[Clusterpup]

Thanks for the replies guys. It seems that when this truck was rebuilt from an accident beforee I owned the truck they bypassed the reseveroir and that why I lose vacuum when I rev up the engine. I will be addressing this next weekend.


Thanks for the drawing Steve.

 

[Kanyne]

Bought a 2001 Sport Trac 4WD 4.0 SOHC last week with a similar problem. When the engine was rebuilt, it looks like they left the vac reservoir off. Now I need to find the source of the vacuum going into the reservoir.