Heater/Evaporator/Fan (Hvac) Unit; To Remove Hvac Unit - Lotus Evora Service Notes

Lotus Service Notes
PN.9 - RECEIVER-DRIER
If the system has been open to atmosphere for any length of time, e.g. following accident damage or a
burst hose or damaged component, the receiver-drier unit must be renewed, and should be the last component
to be fitted, and uncapped only immediately prior to connection and recharging.
The receiver-drier is clamped to a mounting bracket fixed to the outside face of the front subframe RH
longeron, ahead of the front wheel, and is accessible from beneath with the front undertray removed. If the
receiver-drier is to be replaced, the refrigerant must first be recovered using suitable equipment connected to
the service ports at the rear of the RHF wheelarch.
- Cap all pipes and ports immediately after disconnection to prevent the ingress of dirt and moisture.
- When reconnecting the pipes, use new 'O' rings coated in an approved refrigerant oil, and tighten to
25 - 30 Nm.
- If a new receiver-drier is fitted, add 30 cm³ of approved refrigerant oil to the system.
- Recharge the system with 0.625 kg of R134a.
PN.10 - HEATER/EVAPORATOR/FAN (HVAC) UNIT
The HVAC unit comprises left and right hand plastic mouldings sandwiched together and containing a
pair of blower fans supplied from two intake sources, an a.c. evaporator, a heater matrix, and two electrically
controlled flaps; one for the fresh air intake and one for the heater matrix. The complete HVAC unit is mounted
between the chassis front bulkhead and subframe cross-member, with the steering rack beneath, and the
radiator air outlet duct ahead.

To Remove HVAC Unit

1. Remove the front undertray, front clamshell, radiator air outlet ducts and HVAC air inlet duct.
2. Remove the wiper motor mechanism from the windscreen surround.
3. Recover the refrigerant.
4. Remove the HVAC pollen filter intake moulding.
5. Unplug the fan harness connector block, and disconnect the heater flap and air inlet flap actuators.
6. Release the a.c. pipes clamp plate from the expansion valve, release the outlet pipe 'P' clip and secure
the pipe aside, with both pipe and expansion valve port capped. Remove the pipe between receiver-drier
and expansion valve, and cap all pipe ends and ports.
7. Remove the subframe crossmember. Remove:
- 2 bolts securing the top of the HVAC unit to the subframe crossmember;
- 2 bolts each side to top of longerons;
- 2 Torx head screws each side to top of longerons;
- 4 bolts each side securing the crossmember wall to the inboard side of the longeron;
- 3 bolts securing lower edge of wall to subframe lower crossmember.
Withdraw the crossmember/wall assembly.
8. From beneath, release the single bolt securing the HVAC unit to the chassis bulkhead, and the two bolts
joining the fan housing bracket to the lower crossmember bracket.
9. Withdraw the HVAC unit.
The expansion valve is fitted onto the evaporator inlet and outlet pipes, and its removal requires disas-
sembly of the HVAC unit. Determine the availability of the valve before embarking on such a task.
Section PN
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