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Why do I have air in my system after manual vacuuming?

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You need to get all air out of 'vac' pipe before starting to 'vac'.

Best way is to start with 'vac' end - place in pool and push to bottom - let rest of hose follow - keeping hose under water (as much as possible )

** sorry if you are doing this all-ready.

Posted on Jul 06, 2009

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Posted on Jan 02, 2017

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What is the automatic control system 96 astro van


not understanding meaning of automatic control --the following link is the owners manual for your vehicle which explains the operation of your vehicle the link is for you in case yours is not available
1996 Chevrolet Astro Manuals

May 28, 2016 | 1996 Chevrolet Astro

1 Answer

My heating is continually on and i cant turn it off any ideas how to solve this


What make vehicle do you have an is it a automatic or manual HVAC system - heating ventilation an air-conditioning ! Some of these system have vacuum actuated valves that control the water flow in a out of the heater core an vacuum controlled mode doors an or electronically controlled actuators that direct air flow in the system ! They differ from manufacture to manufacture !

Jul 11, 2015 | Cars & Trucks

1 Answer

Can I manually open something to direct cool air into the vents of my 2000buik lesabre.. The air conditioner works I just need to open up a door or something.. I was told


If air is not coming out of your air conditioning vents when the system is on, the BLEND DOOR is not open. This isn't something you manually open, it is automatically opened by a vacuum motor (when it is working). If it is not opening properly, it is usually because a vacuum line has fallen off or broken under the dashboard, or there is a plenum vacuum leak somewhere, sufficient to reduce the vacuum to the air conditioning system that it cannot function properly.
If you hear a sucking/hissing sound under the dashboard, you can find the noise to find your vacuum leak.

May 22, 2015 | Heating & Cooling

1 Answer

1997 Ford Taurus front defrost not working


. Air won't blow out of the floor or center vents just defrost ? Do you have manual or automatic climate control ?
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob mounted on the A/C-heater function selector switch, which is part of the integrated control panel.
  • The function selector knob has the following positions: OFF, MAX A/C, A/C, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST. The A/C-heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318). Refer to the Vacuum Control Diagram , System Airflow Schematics and Vacuum Control Chart .
  • Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical switches controls the electrical supply to the A/C clutch and heater blower motor switch (18578).
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • Vacuum Control Motors The vacuum control motors (18A318):
    • are located on the A/C evaporator housing, A/C recirculation air duct and heater air plenum chamber (18471).
    • direct system airflow to the vehicle interior as determined by the remote climate control module or manual override.
    • The five-passenger seating configuration has an additional vacuum control motor mounted on the heater air plenum chamber to control airflow to the rear seat A/C register (19893).


vacuum control motor-i4bq0ig33y1522pr2d2rrkk3-2-0.gif

Jul 09, 2017 | Ford Cars & Trucks

2 Answers

4runner v8 what is dis code p0412 and how do i fix it.with pix pls.


I'm going to post the description from engine-codes.com since it is a big paragraph. You will need a shop manual or else take it to a repair shop that has the equipment and book to check it out.

P0412 TOYOTA Description
An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module (PCM) grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.
The DTC P0412 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.
Read more: http://engine-codes.com/p0412_toyota.html#ixzz2Y7OQTCbb

Jul 04, 2013 | Cars & Trucks

1 Answer

Air conditioning will not switch from defrost vents


Vacuum control motors are used to position these airflow control doors.
SECTION 412-01: Air Distribution and Filtering 2000 Expedition/Navigator Workshop Manual DESCRIPTION AND OPERATION Procedure revision date: 06/17/1999 Air Distribution There are two sources of air available to the air distribution system:
  • outside air
  • recirculated air
Recirculated air is only used during MAX A/C, AUTOMATIC (if equipped with EATC) and OFF modes.
Air distribution within the vehicle is determined by the function selector switch position, if equipped with manual A/C, or is controlled by the electronic automatic temperature control system in the AUTOMATIC mode but can be overridden by the driver if desired. Airflow control doors are used to direct airflow within the heater air plenum chamber. Vacuum control motors are used to position these airflow control doors.
The air distribution system is designed to provide airflow from the defrost nozzle when no vacuum is applied to any of the vacuum control motors. This is done to prevent a situation where defrost cannot be obtained due to a system vacuum leak.
Air enters the passenger compartment from the:
  • instrument panel A/C registers.
  • heater outlet floor duct.
  • windshield defroster hose nozzle.
  • side window demisters.
  • rear seat airflow duct (if equipped).
Passenger compartment air is exhausted from the vehicle through open windows or cab air vents.


expedition air flow hvac system-xvcmtr1jbqa4kfrdszeh0lpe-3-0.gif 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 Air inlet duct door (full vacuum position) 8 - Outside air inlet 9 18A318 Vacuum control motor - air inlet duct door 10 - Recirculated air inlet 11 19805 Blower motor 12 - Vacuum to emission control 13 - Vacuum from the engine intake manifold 14 19A563 A/C vacuum check valve 15 19A566 A/C vacuum reservoir tank and bracket 16 19B888 A/C-heater function selector switch 17 18476 Heater core 18 18A559 Floor/panel door (full vacuum position) 19 - Floor airflow 20 18A318 Vacuum control motor - floor/panel door 21 - Panel vent airflow
Check vacuum control to the panel defrost motor ( vac,diaphragm )

Nov 01, 2017 | 2001 Ford Expedition

1 Answer

Vacuum leak when AC is on


Possible vents, heating system

Apr 28, 2017 | Volkswagen Cars & Trucks

1 Answer

Climate Control - Heat and cool work fine. Air flow is directed to defrost /floor. No indication (Sound or sight) that the vacuum diaphrams are being activated. The display on the dash matches the...


Does your vehicle have manual or automatic climate control ? You system is stuck in floor an defrost mode ?

03 mercury grand marquis hvac air flow .-13qahwfdndst2y1hypmr2cdq-4-0.gif Item Part Number Description 1 18A318 Vacuum control motor-floor/defrost door 2 - Defrost air flow 3 18A478 Floor/defrost door 4 18476 Heater core 5 19860 Evaporator core 6 19805 Blower motor 7 - Outside air inlet 8 19A813 Air inlet door 9 18A318 Vacuum control motor-air inlet door 10 - Recirculated air inlet 11 18B545 Temperature blend door 12 18A559 Panel door 13 - Panel air flow 14 18A318 Vacuum control motor-panel door 15 - Floor air flow 16 - Vacuum from the engine intake manifold 17 19A563 A/C vacuum check valve 18 19A566 Vacuum reservoir tank and bracket 19 19980 EATC control
Pull the control panel an check for vacuum

vacuum lines hvac 03 grand marquis-13qahwfdndst2y1hypmr2cdq-4-2.gif Item Part Number Description 1 White Air inlet door 2 Yellow Floor/defrost door 3 Red Floor door 4 Blue Panel door 5 Black Source vacuum 6 - Not used


VACUUM APPLICATIONS CHART-ELECTRONIC AUTOMATIC TEMPERATURE CONTROL Switch Port Vacuum Harness Hose Color Func- tion Manual Override Selector Buttons OFF MAX A/C NORM A/C VENT FLOOR FLOOR/ DEF DEF 1 White Air inlet 2 Yellow Floor/ panel (partial) 3 Red Full floor 4 Blue Panel 5 Black
Source

May 21, 2017 | 2003 Mercury Grand Marquis

1 Answer

How to clean the egr valve


disconnect from vehicle's vacuum system. manually apply shop air to egr ( careful no to damage pintle or bellows. Manually apply vacuum to egr if bellows moves and the valve hold vacuum then your done. Use brake cleaner and shop air for stubborn cloggs.

Dec 14, 2010 | 1998 Chevrolet Tracker

1 Answer

2000 mercury grand marquis HVAC air distribution problem. Air comes out defrost vents regardless of control settings.


there is a vacuum motor that controls direction for air flow. when there is a vacuum leak, the control door defaults to the defrost vent. the motor, vacuum lines and directional control knob must be inspected. most of the time i have found that there is a vacuum line broken. purchasing a repair manual will help locate and discribe the system.

May 24, 2010 | 2000 Mercury Grand Marquis

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