64 11 206 Removing and Installing/Renewing Heating Unit

64 11 206 Removing And Installing/Replacing Heating And Air-Conditioning Unit

Special tools required:







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Avoid contact with refrigerant and refrigerant fluid.
Read and comply with safety information:
- Handling R 134a (tetrafluorethane) refrigerant
- Handling refrigerant fluid

IMPORTANT:
Risk of damage.
Restart engine only when air conditioning system has been correctly filled.
Follow notes for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours: Replace desiccant insert for air conditioning system.







Necessary preliminary work:
- Drain off air conditioning system
- Remove acoustic insulation from bulkhead upper section
- Remove blower housing for heating and air-conditioning unit
- Remove left suspension cross-brace
- Remove carrier for dashboard
- Disconnect plug connections
- Unclip wiring harness mountings from heating and air-conditioning unit







Recycling
Coolant emerges when coolant lines are detached. Have a suitable collecting vessel ready.
Catch and dispose of escaping coolant.
Observe country-specific waste disposal regulations.







Feed out line penetration (1) towards top.







Release screws (1) and remove refrigerant lines (2) with associated seal.
Tightening torque 64 53 1AZ.

Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.







IMPORTANT:
Connections must not be mixed up.
Mark connection sequence of water hoses prior to removal.

Release hose clamps (1) with special tool 17 2 050 and detach coolant hoses (2).






IMPORTANT:
Carefully blow out coolant ports on the heat exchanger to remove the remaining coolant.
Close openings or line to heat exchanger with special tool 32 1 270, to avoid media leak and dirt contamination.







Equipment specification with electric auxiliary heater only:
Release screw (1).
Remove earthing cable for electric auxiliary heater (2) from floor trim panel (3).







NOTE:
Length of earthing cable (1) must lie between points 2 and 3 and should be 230 mm to 235 mm long.
Run excess cable as shown in item (4).







Unlock retaining lug (1) on gaiter (2).
Lever gaiter (2) out of guides.

Installation note:
Make sure retaining lug (1) and adjacent guides are correctly engaged.







WARNING: Protect passenger compartment against emerging coolant.

Unclip air ducts (2), left and right towards bottom, from heater/air conditioner (1).
Feed out heating and air-conditioning unit (1) in direction of arrow.

Installation note:
Water drain (3) must be inserted on both sides into outlet channel (4).

IMPORTANT: In the event of incorrect fitting, there is a risk of leakage in the passenger compartment.







Replacement:
- Modify evaporator
- Modify heat exchanger
- Modify expansion valve
- Modify all actuator drives
- Modify ozone generator if necessary
- Modify electric auxiliary heater (front) if necessary







After installation:
- Evacuate and fill A/C system
- Bleed and fill cooling system