Vacuum Hose, Manual Heating & A/C

Manual Heating & A/C

Components In Engine Compartment, Servicing

Vacuum Hose, Layout

NOTE:

- Arrows indicate vacuum.
- Insert vacuum hose into vacuum reservoir 30 mm (13/76 in). Insert vacuum hoses onto plastic connectors 15 mm (19/32 in).
- Illustration shows vehicle with engine, code AES & AXK






1 - Fresh air/recirculating flap vacuum unit
2 - Vacuum supply to rear passenger compartment ventilation unit.*
- * Where applicable

3 - Fresh
- Air/recirculating Flap Two-way Valve -N63-
- Controls vacuum flow to fresh air/recirculating flap vacuum unit.
- Replacing:
- Remove glove compartment, knee padding or passenger side airbag unit.

- After attaching vacuum hoses, check:
- The fresh air/recirculating flap vacuum unit must pull in if vacuum and voltage are present at -N63-.
- The fresh air/recirculating flap vacuum unit is vented if vacuum is present and voltage is not (switched off).

4 - Vacuum unit connection
5 - Intake manifold connection
6 - Engine Coolant Two-way Vacuum Valve -N147-
- Shuts Off vacuum flow when no voltage is present.
- After attaching vacuum hoses, check:
- When connected the vacuum unit must pull in if voltage and vacuum are present.
- When connected the vacuum unit is vented if vacuum is present and voltage is not.

7 - Vacuum hose
- From -N147- to coolant cut-off valve

8 - Coolant cut-off valve
- When engine running, valve is closed via vacuum by engine coolant two-way vacuum valve -N147-

- When engine not running vacuum), valve opens allowing coolant Pump -V50- to circulate coolant through radiator

9 - One-way valve
- Direction of vacuum indicated by arrow

10 - From brake booster vacuum hose connection
- Only on engine, code AAB

11 - Vacuum unit
- Only on engine, code AAB
12 - To intake manifold
13 - From brake booster
14 - Vacuum reservoir
- Where applicable

15 - Vacuum hose
- From vacuum reservoir in engine compartment to fresh air/recirculating flap vacuum unit