SEAT Workshop Service and Repair Manuals

Repairing the air conditioning: Engine compartment   WARNING Before working on the electrical system, disconnect the battery earth strap.   Note t  For radios with an anti-theft code, check the code before removing the battery. t  When reconnecting the battery, do the following work depending on the vehicle equipment: Code the radio, readjust the clock, activate the electric windows ⇒ Inspection and maintenance. t  All of the components marked with * and the refrigerant pipes and tubes may only be repaired or replaced in agreed technical service workshops as the refrigerant must be drained beforehand, with a maintenence station. t  You must take the safety precuations necessary for working on vehicles with air conditioning and for handling refrigerant R134a. t  You must follow the instructions for work on the refrigerant circuit. t  Do not start the engine if the refrigerant pipes are not connected to the compressor and the compressor is sealed with stoppers.

1 -	Support for the refrigerant pipes

q	Correctly fit the refrigerant pipes

q

→ Fig.

2 -	Outlet valve*

q	Low-pressure side

q	Only for removal and measurement

q	Always screw the cap on with the ring seal.

3 -	Quick connector for the refrigerant pipes*

q	Low-pressure side

q

→ Chapter

4 -	High-pressure sender -G65-.

q

Operation

q	Removing and fitting → Chapter

5 -	Support for the refrigerant pipes

q	Secured with a plastic nut 2.7 Nm

6 -	Air inlet hole in the air conditioning unit

q	Under the cover in the water collection box

7 -	Expansion valve*

q	Removing and fitting the refrigerant pipes → Fig. in → Fig.

q	Removing and fitting → Chapter

8 -	Valve for the condensation water outlet*

q	Behind the heat-proof mat of the transverse panel (mounting plate)

q	Only fit this when the air conditioning unit is not installed.

q	Check figure → Fig. in → Fig.

9 -	Extraction and filling valve*

q	High pressure side, for drainage, filling and measuring.

q	Always screw the cap on with the ring seal.

10 -	Condenser*

q	Removing and fitting the refrigerant pipes → Fig. in → Fig. and → Fig. in → Fig.

q	Removing and fitting the condenser → Chapter

11 -	Regulating valve of the air conditioning compressor -N280-*

q	Forms part of the compressor. Do not replace separately.

q	Check → Vehicle diagnosis, testing and information system VAS 5051

q	Regulating valve with coil resistance at 20°C: 10,6 ± 0,4 Ω.

The regulating valve receives a PWM (500 Hz) signal from the air conditioning control unit -J301- according to the refrigeration power requirement and regulates the compressor through the suction pressure/position of the inclined plate.

12 -	Overpressure valve*

q	O-rings: 8.6 mm; 1.8 mm

q	Tightening torque: 10 Nm

q

Operation

q	Testing → Chapter

13 -	Compressor*

q	Manufacturer: Denso, denomination: 6 SEU 12C

q	Removing and fitting the compressor and its support → Fig. in → Fig.

t	Removing and fitting the refrigerant pipes. Figure → Fig. in → Fig.

t	Protecting the belt with the compressor locked. Figure → Fig. in → Fig.

t	Filling rules → Chapter

t	The flow from the compressor is regulated on the suction side by a regulating valve with external control according to the refrigeration power requirement.

t	If the air conditioning is disconnected due to a loss of refrigerant, the compressor lubrication is still guaranteed.

t	Do not start the engine if the refrigerant pipes are not connected to the compressor and the compressor is sealed with stoppers (risk of overheating).

14 -	Oil drain plug*

q	With O-ring

q	Tightening torque: 15 Nm

q	To drain the refrigerant oil: remove the compressor, remove the oil drainage screw and turn the compressor on the pulley to drain the oil more quickly.

15 -	Tank for liquid with drying element*

q	Forms part of the condensor

q	Replace the drying element every time you open the refrigerant circuit.

q	Assembly overview for the drying element. Figure → Fig.

q	Removing and fitting the drying element → Chapter

16 -	Quick connector for the refrigerant pipes*

q	High-pressure side

q	Remove → Chapter

Removing and fitting the refrigerant pipes - condenser input 1 -  5 Nm 2 -  Clip 3 -  High-pressure sender 4 -  12 Nm 5 -  Connector for refrigerant pipes t  Fixed safety catch with pressure bushing 6 -  O-rings 10.80 mm; 1.82 mm t  Replace 7 -  Condenser   Note t  Seal the refrigerant pipes and the connection to the condenser t  Replacing the drying element

Removing and fitting the refrigerant pipes - condenser output 1 -  Quick connector t  Remove → Chapter 2 -  Clip 3 -  5 Nm 4 -  Connector for refrigerant pipes t  Fixed safety catch with pressure bushing 5 -  Condenser/liquid container 6 -  O-rings 10.80 mm; 1.82 mm t  Replace 7 -  15 Nm   Note t  Seal the refrigerant pipes and the connection to the condenser t  Replacing the drying element

Removing and fitting the drying element 1 -  Seal bolt 15 Nm 2 -  O-rings t  Replace 3 -  Drying element t  Replace t  Removing and fitting → Chapter 4 -  Liquid container/condenser

Removing and fitting the compressor and its support 1 -  Support t  Other installation methods specific to each engine 2 -  45 Nm 3 -  Compressor t  Removing and fitting → Fig. 4 -  Bolts and washers t  M8 = 25 Nm t  M10 = 45 Nm 5 -  Tightening bushing for compressor t  They must be assembled in the support -1- or in the compressor -3-   Note After removing the compressor, fix it in the lock housing. Do not let it hang from the refrigerant pipes.

Removing and fitting the refrigerant pipes of the compressor 1 -  22 Nm 2 -  Connector for the suction tubing t  Fixed safety catch with pressure bushing -4- 3 -  O-rings 23.80 mm; 2.40 mm t  Replace 4 -  Pressure bushing 5 -  O-rings 10.80 mm; 1.82 mm t  Replace 6 -  Connector for the suction tubing t  Fixed safety catch with pressure bushing -4-   Note t  The position of the refrigerant pipes is different depending on the engine. The fixing in the compressor is the same in all models. t  Seal the refrigerant pipes and the connections to the condenser t  Replace the drying element → Fig.

Protecting the belt with the compressor locked The compressor operates constantly due to a drag-controlled coupling -1- and -2- in the belt drive, independently of whether the air conditioning is connected or not. When the compressor is locked, depending on the temperature of the compressor, the rubber elements break -2- or the drive plate deforms -1-. In all cases, the compressor pulley can turn while the drive plate / compressor shaft are stopped. In this case the compressor must be relaced.

Support for the refrigerant pipes 1 -  Connector t  Remove → Chapter 2 -  Low-pressure valve 3 -  Support t  Bolt it in the longitudinal beam t  Correctly fit the refrigerant pipes 4 -  2 Nm

Removing and fitting the refrigerant pipes on the expansion valve 1 -  Expansion valve t  Removing and fitting → Chapter 2 -  O-rings 10.80 mm; 1.82 mm t  Replace 3 -  Connector for the suction tubing t  Fixed safety catch with pressure bushing 4 -  O-rings 14.30 mm; 2.40 mm t  Replace 5 -  10 Nm 6 -  Connector for the suction tubing t  Fixed safety catch with pressure bushing   Note t  Seal the refrigerant pipes and the connections to the expansion valve t  Replace the drying element → Fig.

Check the valve for the condensation water outlet Check this if the floor beneath the air conditioning gets wet with the air conditioning connected. –  Open the perforation of the cover -1- in the lower part of the heat-proof mat -4- and open the cover upwards. To guarantee the valve for the condensation water outlet operates correctly, make the following checks: t  The valve for the condensation water outlet -5- must not be obstructed. t  The sealing lip -3- of the seal in the transverse panel (mounting plate) must be placed in the support groove -2--arrows-. t  The valve for the condensation water outlet is fixed in the support -2- and in the air conditioning unit. t  The heat-proof mat must not be deformed or defective around the area of the valve for the condensation water outlet.   Note The cover -1- must close flush with the heat-proof mat -4-. If the cover is too tight -1-, it could jam the cap of the valve for the condensation water outlet -5-.