Right Heat Exchanger (Front Passenger's Side), Removing and Installing
Right Heat Exchanger (front Passenger's Side), Removing And Installing
NOTE: Remove left heat exchanger first.
Removing
- Perform preparatory work involved with heat exchanger removal.
- Remove glove compartment.
- Remove footwell vent.
- Cover carpet under heat exchanger with impermeable sheeting and absorbent paper.
- Slightly moisten contact surface between both coolant pipes -D- and -E- at grommet -C- from inside as well with silicone lubricant (to ensure that pipes can be moved without changing position of grommet; this illustration shows pipes as viewed from plenum chamber).
- Remove clamps -A- and -B-.
- Take both coolant pipes out of heat exchanger.
- Push both coolant pipes towards plenum chamber.
NOTE: As grommet has been moistened slightly with silicone lubricant in area of coolant pipe penetration, pipes can be moved without grommet being pushed out of heating and A/C unit.
- Screw out bolts -C-.
- Detach holder.
- Pull heat exchanger -D- out of heating and A/C unit.
Installing
- Before installing heat exchanger, check condensate drain openings -A- for dirt and clean if necessary.
NOTE:
- Condensate drain must not be impaired by dirt or other deposits.
- Illustration shows drain openings with heat exchangers in position.
Cleaning condensate drain
- Heat exchangers removed:
Insert illuminated angled mirror into opening for heat exchanger and check both drain openings. Clean condensate drains if necessary using a piece of wire, for example.
- Heat exchangers in position:
With condensate hose detached, clean condensate drains from outside using a piece of wire, for example.
Perform further installation in reverse order, paying attention to the following:
- Check attached foam seal before fitting heat exchanger.
NOTE:
- Seal may curl up on insertion if not correctly bonded on.
- Cold air may flow past heat exchanger if seal is damaged or not properly fitted.
- Secure all connections with standard clamps or with retainers approved for these connections.
NOTE: Clamps -A- and -B- may be difficult to attach with the heating and A/C unit installed.
- Retainers -A- and -C- should be used so as to permit service replacement of heat exchangers with heating and A/C unit in position.
- Check both coolant pipes -B- and connections at heat exchanger -C- for damage and dirt.
NOTE: Sealing rings must always be replaced.
- Moisten sealing ring -A- slightly with coolant and attach it to coolant pipe -B-.
- Attach retainer -A- (with studs) to connection at heat exchanger -B- as shown in illustration.
- Attach retainer -C- (with holes) to coolant pipe -D- as shown in illustration.
- Insert coolant pipe -D- (with sealing ring) into connection of heat exchanger -B-.
- Secure coolant pipe in heat exchanger with retainers -C- and -D-.
- Tighten both hex nuts -A- and -B- alternately and evenly (tightening torque 3 Nm).
NOTE:
- Retainers -C- and -D- must be fitted as shown in illustration (pay attention to external shape).
- When tightening hex nuts, take care not to tilt retainers.
- After securing coolant pipes, check position of retainers. They must not make contact with other components.
- Install second coolant pipe in the same way.
- Before installing glove compartment, check cooling system for leaks.
- Before installing glove compartment and plenum chamber cover, check position of grommet in coolant pipe penetration to plenum chamber.
- Before attaching 2-pin connector to Coolant Pump -V50- of pump/valve unit, bleed coolant circuit
NOTE:
- Coolant Pump -V50- of pump/valve unit should not be started up until coolant circuit has been bled.
- Dry running of pump in pump/valve unit will lead to destruction.
- When bleeding coolant circuit, take special care to ensure complete bleeding of heat exchangers. If air bubbles remain in heat exchangers, customer complaints may be received about lack of heating output in winter or differences in temperature of air flowing out of vents with same setting in control mode.