Auxiliary Cabin Heater Control Valve: Service and Repair

Removing And Installing Directional-Control Valve

Tools







Technical values







Preliminary work
1. Remove complete heater.
2. Remove intake muffler with intake manifold.

Removing directional-control valve












1. Release connector -arrow A- and pull it off the directional-control valve -arrow B-.







2. Unscrew fastening screw -2- and remove water tube holder -1-.







3. Drill out blind rivet -1- at the water tube.
4. Remove water tube holder.
4.1. Screw off both fastening nuts -1-.
4.2. Unscrew fastening screw -2-.







4.3. Remove water tube holder -3- (-arrow-).

5. Loosen water tube at the heater.
5.1. Undo spring band clamp using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 (-arrows A-) and push down off the adapter -arrow B-.







5.2. Pull water tube down off heater -arrow C- and remove it.







6. Unscrew fastening screws -1- on the heater.
7. Loosen water tube on directional-control valve at the top.
7.1. Undo spring band clamp using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 (-arrows A-) and push down off the connection -arrow B-.







7.2. Pull water tube off the directional-control valve -arrow C- and swivel it downwards.

8. Remove directional-control valve holder.
8.1. Unscrew both fastening screws -1- on the directional-control valve -2-.
8.2. Screw off both fastening nuts -3- on the directional-control valve holder -4-.







8.3. Remove directional-control valve holder -4- (-arrow-).

9. Remove directional-control valve.
9.1. Undo spring band clamps using assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 (-arrows A-) and push down off the connections -arrows B-.







9.2. Pull directional-control valve out of the moulded hoses -arrow C- and remove it.

Installing directional-control valve
1. Install directional-control valve.

INFORMATION: Before connecting the water hoses, apply suitable rubber lubricant to the flanges.

1.1. Push directional-control valve into the moulded hoses -arrow A-.
1.2. Slide spring band clamps onto the connections using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 (-arrows B-) and align with the markings.







1.3. Slacken spring band clamps -arrows C- and secure the hoses.

2. Install directional-control valve holder.
2.1. Insert directional-control valve holder -4- (-arrow-).
2.2. Secure directional-control valve holder -4- using the two fastening nuts -3-. - Tightening torque: 6 Nm (4.5 ftlb.)







2.3. Screw down directional-control valve -2- using the two fastening screws -1-. - Tightening torque: 3.5 Nm (2.5 ftlb.)

3. Secure water tube on the directional-control valve at the top.

INFORMATION: Before connecting the water hoses, apply suitable rubber lubricant to the flanges.

3.1. Swivel water tube upwards and slide it onto the directional-control valve -arrow A-.
3.2. Slide spring band clamp onto the connection using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 (-arrow B-) and align with the markings.







3.3. Slacken spring band clamp -arrows C- and secure the hoses.







4. Position heater on holder and secure with the fastening screws -1-. - Tightening torque: 8 Nm (6 ftlb.)
5. Secure water tube at the heater.

INFORMATION: Before connecting the water hoses, apply suitable rubber lubricant to the flanges.

5.1. Place water tube in installation position and slide it onto the heater -arrow A-.
5.2. Slide spring band clamp onto the connection using the assembly pliers for spring band clamps, Cayenne hose connections NR.72-1 (-arrow B-) and align with the markings.







5.3. Slacken spring band clamp -arrows C- and secure the hose.

INFORMATION:
- Make sure the water tube holder is installed at the correct position.
- The exhaust pipe runs behind the water tube holder.

6. Install water tube holder.
6.1. Position water tube holder -3- (-arrow-).
6.2. Tighten fastening screw -2-. - Tightening torque: 4.5 Nm (3.5 ftlb.)







6.3. Tighten fastening nuts -1-. - Tightening torque: 6 Nm (4.5 ftlb.)







7. Position water tube on holder and secure with a blind rivet -1- (4.8 x 10).







8. Push water tube holder -1- onto the two water tubes and screw down using the fastening screw -2-. - Tightening torque: 3 Nm (2 ftlb.)







9. Plug connector onto the directional-control valve -arrow- until the connector engages securely.

Subsequent work
1. Install intake muffler with intake manifold.
2. Install complete heater.