Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1186 (CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS)DIAGNOSTIC TESTSCLIMATE CONTROL SYSTEMVACUUM SYSTEM
2009 Mercury Milan Premier, 3.0 1, AWD
Vacuum System
2009 Mercury Milan Premier, 3.0 1, AWDSECTION Vacuum System
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Part Number | Description |
|---|---|---|
| 1 | - | Vacuum to the auxiliary A/C system (if equipped) |
| 2 | 18A318 | Vacuum control motor - floor/panel door |
| 3 | - | Panel vent airflow |
| 4 | - | Floor/panel door (full vacuum position) (part of 18471) |
| 5 | 18B545 | Temperature blend door (full heat position) |
| 6 | 19860 | Evaporator core |
| 7 | 19A813 | Air inlet 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 | 18476 | Heater core |
| 13 | - | Vacuum from the engine intake manifold (gas engine) or vacuum pump (diesel engine) |
| 14 | 19A563 | A/C vacuum check valve |
| 15 | 19A566 | A/C vacuum reservoir tank and bracket |
| 16 | 19B888 | Function selector switch |
| 17 | - | Floor airflow |
| 18 | 18A318 | Vacuum control motor - floor/defrost door |
| 19 | - | Floor/defrost door (full vacuum position) (part of 18471) |
| 20 | - | Defrost airflow |
| Port | Hose Color | Function |
|---|---|---|
| 1 | White | Recirculation air duct door |
| 2 | Red | Floor/defrost door |
| 3 | Yellow | Floor/defrost door |
| 4 | Blue | Floor/panel door |
| 5 | Black | Vacuum source |
| 6 | - | Not used |
VACUUM APPLICATION CHART
| Switch Port | Color | Function | Function Selector Switch Position | ||||||
|---|---|---|---|---|---|---|---|---|---|
| MAX A/C | NORM A/C | VENT | OFF | FLOOR | MIX | DEF | |||
| 1 | White | Recirc/fresh | V | NV | NV | V | NV | NV | NV |
| 2 | Red | Floor/defrost | V | V | V | V | V | NV | NV |
| 3 | Yellow | Floor/defrost | V | V | V | V | V | V | NV |
| 4 | Blue | Floor/panel | V | V | V | NV | NV | NV | NV |
| 5 | Black | Vacuum source | V | V | V | V | V | V | V |
| V = Vacuum NV = No Vacuum |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.