Auxiliary Air Conditioner
An auxiliary evaporator for increased refrigeration output is available as an option (M 570). The auxiliary evaporator with 3-stage blower is installed instead of the rear parcel shelf.
Removing and
Installing
Evaporator
1.Remove rear seat backrests.
2.Remove air intake screen.
3.Remove upper cover.
4.Remove lower cover.
5.Withdraw temperature sensor.
6.Unscrew Allen-head bolt.
7.Remove mounting screws {6 screws).
Note:
The tightening torque for the M 6 Allen-head bolt is 9 Nm (7ftlb). Renew 0-rings in the connections in the lines to the expansion valve.
Removing and Installing Expansion Valve
1.Remove air intake screen
4.Unscrew M 5 Allen-head bolts.
Note:
Tightening torques
2.Remove upper cover.
Renew al1 4 0-rings.
3.Unscrew M 6 Allen-head bolt.
Removing and Installing Blower
1.Remove evaporator (see page 87 -120).
2.Disconnect cable from blower.
3.Disconnect plug-in connector to series resistors.
4.Remove 4 mounting screws.
Removing and Installing Series Resi stors
1.Remove covers, see section headed Removing and Installing Evaporator.
2.Disconnect plug-in connector.
3.Remove mounting screws.
1.Remove radio.
2.Beginning at top, pull frame up and out.
3.Pull socket housing off switch and regulator. Special tool P 9245
4.Disconnect cable to clock.
5.Remove control knobs.
6.Unscrew covers with special tool P 9245.
Removing and Installing Solenoid Valve
Note:
The solenoid valve is located beneath the passenger seat.
1.Remove passenger seat. If seat is electrically adjustable, move seat to highest position to facilitate removal.
2.Remove carpet.
3.Disconnect plug-in connector.
Checking Control Unit
Note:
The control unit is located to the right of the blower.
1.Remove covers, see section headed Removing and Installing Evaporator.
2.Disconnect plug.
Note:
The terminal designations on plug receptacle and control unit are not identical. The inspection described below refers to the designations on the control unit. Check receptacle after unplugging.
3.Connect voltmeter to plus and terminal 1.
4.Unscrew threaded couplers.
Note:
Use a suitable wrench to counter when unscrewing or tightening threaded couplers.
Renew 0-rings.
Reading: Battery voltage
4.Connect voltmeter to minus and terminal 4. Switch on ignition and blower for auxiliary air conditioner.
Reading: Battery voltage
5.Connect ohmmeter to terminal 2 and minus.
6.Connect ohmmeter to terminal 2 and terminal 3.
Reading: 1 - 10 kOhm + 10%, depending on setting of temperature regulator.
Note:
If the readings under points 4 and 5 are not attained, check temperature regulator separately.
Terminals I and II: 10 kOhm + 10% Terminal II and +: 0-10 kOhm + 10%
7.Connect ohmmeter to terminal 6 and minus.
Reading: at 20°C approx. 3.5 kOhm at 25°C approx. 2.8 kOhm
The resistance diminishes as temperature increases.
8.With ignition and auxiliary blower switched on, bridge terminal 4 and terminal 5 with a suitable jumper lead. The response of the solenoid valve must be audible.
Printed in Germany
Auxiliary Air Conditioner
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