Refrigerant Lines With Inner Heat EXCHANGER, Removing And Installing: Installing
Installation is done is reverse order, observe the following:
Electrical connections and routing. Refer to the appropriate SYSTEM WIRING DIAGRAM.
-- Thoroughly clean all the connections in the expansion valve -B- and in the refrigerant line -D- with the inner heat exchanger.
-- Check the connections in the expansion valve -B- and on the refrigerant line -D- for damage.
-- Replace the quick-coupling connections on the refrigerant line with inner heat exchanger. Refer to REFRIGERANT LINES, DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING .
-- Replace the O-rings -A- and -C-. Allocate correct version.
Follow the instructions for installing the O-rings. Refer to REFRIGERANT CIRCUIT SEALS .
-- Coat the O-ring seals lightly with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .
-- Make sure the O-rings fit properly inside the grooves on the refrigerant line connections -D-.
-- Tighten the bolts -E- for the refrigerant line connections -D- with inner heat exchanger.
- Tightening specification -E- : 10 Nm.
-- Tighten the nut -C- for the refrigerant line -B-.
-- Install the plenum chamber front wall. Refer to OVERVIEW - BULKHEAD .
Install refrigerant line such that it is not strained.
Check installation position of refrigerant line to expansion valve (it should not come in contact with other components).
-- Install the refrigerant line on the quick-coupling connections. Refer to REFRIGERANT LINES, DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING .
-- Install the remaining removed components.
-- Evacuate the refrigerant circuit and fill it. Refer to USING SERVICE STATION . For additional information, refer to OVERVIEW - REFRIGERANT CIRCUIT, NOT OPENING THE REFRIGERANT CIRCUIT, VEHICLES WITHOUT HIGH VOLTAGE SYSTEM and OVERVIEW - REFRIGERANT CIRCUIT, OPENING THE REFRIGERANT CIRCUIT, VEHICLES WITHOUT HIGH VOLTAGE SYSTEM (Refrigerant R134a, Servicing; Refrigerant Circuit, Using Service Station).
-- Turn on the ignition.
-- Check the DTC memory for the Climatronic Control Module -- display and control head and erase any displayed malfunctions, if necessary using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
-- Operate the A/C system after filling the refrigerant circuit. Refer to A/C SYSTEM, STARTING OPERATION AFTER FILLING REFRIGERANT CIRCUIT .
Observe the information regarding operating the A/C system after filling. Refer to A/C SYSTEM, OPERATING AFTER CHARGING , (Refrigerant R134a, Servicing; A/C System, General Information). After charging the A/C system before activating the A/C system.
Installation is done is reverse order, observe the following:
Electrical connections and routing. Refer to the appropriate SYSTEM WIRING DIAGRAM.
-- Thoroughly clean all the connections in the expansion valve -B- and in the refrigerant line -D- with the inner heat exchanger.
-- Check the connections in the expansion valve -B- and on the refrigerant line -D- for damage.
-- Replace the quick-coupling connection on the refrigerant line with inner heat exchanger. Refer to REFRIGERANT LINES, DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING
-- Replace the O-rings -A- and -C-. Allocate correct version.
Follow the instructions for installing the O-rings. Refer to REFRIGERANT CIRCUIT SEALS .
-- Coat the O-ring seals lightly with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .
-- Make sure the O-rings fit properly inside the grooves on the refrigerant line connections -D-.
-- Tighten the bolts -E- for the refrigerant line -D- with inner heat exchanger.
- Tightening specification -E- : 10 Nm.
On certain versions, the refrigerant line with an inner heater core -A- also has a weight (balance) -B- to reduce noise. When installing the refrigerant lines with an inner heat exchanger and the plenum chamber bulkhead, make sure the weight and the refrigerant line are not too close to the other components or touching them.
-- Clean the connections on the refrigerant pipe and check for damage.
-- If applicable, inspect the alignment pin -4- for damage and check that it is seated correctly.
-- Inspect the guide ring -2- on the refrigerant line connection for damage.
Coat the O-ring with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .
Make sure the O-ring fits correctly inside the groove in the refrigerant pipe.
-- Insert the O-ring seal -3- into the groove -arrow- on the refrigerant line connection -1-.
-- The cover -1- must sit correctly on the refrigerant pipe -2- as illustrated.
-- Make sure the rubber bushing -4- is seated in the mount.
-- Install the refrigerant pipe -6- on the inner heater core and tighten the bolt -5-.
- Tightening specification: 9 Nm.
-- Attach the refrigerant line -3- to the quick-coupling connection. Refer to REFRIGERANT LINES, DISCONNECTING FROM QUICK-RELEASE COUPLINGS AND CONNECTING .
Install refrigerant line such that it is not strained.
Check installation position of refrigerant line to expansion valve (it should not come in contact with other components).
-- Install the remaining removed components.
-- Evacuate the refrigerant circuit and fill it. Refer to USING SERVICE STATION (Refrigerant R134a, Servicing; Refrigerant Circuit, Using Service Station).
-- Operate the A/C system after filling the refrigerant circuit. Refer to A/C SYSTEM, STARTING OPERATION AFTER FILLING REFRIGERANT CIRCUIT .
-- Turn on the ignition.
-- Check the DTC memory and erase any displayed entries using the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.