Radiator & Cooling Fans; Radiator Fans - Lotus Evora Service Notes

Lotus Service Notes
mended coolant mixture (see above) via the header tank. An air bleed plug is located on the heater return
hose near its connection with the return rail, and a bleed nipple is incorporated on the by-pass pipe near its
joint with the thermostat housing. An additional bleed plug is provided on the radiator feed pipe accessible
via a grommet in the LHF wheelarch liner. All bleeds should be opened until a steady stream of coolant flows
from each. Start the engine and allow to idle, and periodically open the bleed plugs to allow any trapped air
to be expunged. Top up the header tank when necessary, and fit the pressure cap when required to prevent
overflow. When the cooling fans have cut in and then out, stop the engine and allow to cool. Re-check coolant
level when fully cold.
KJ.4 - RADIATOR & COOLING FANS
The engine cooling radiator, a.c. condenser and cooling fans are secured together as a package and are
mounted between the two longerons of the front subframe, angled fowards at about 45°, condenser lowermost,
radiator above and the two cooling fans on the top side of the radiator. The radiator uses an aluminium core,
with tubes running vertically between the top and bottom plastic tanks, the upper tank housing both inlet and
outlet spouts and an internal midpoint division, in order to provide a 'U' flow route for the coolant and optimise
radiator cooling performance. To protect the radiator structure from potentially damaging vibrations and road
shocks, the radiator is provided with two spigots on the bottom tank, and a spigot at the top of each sideframe,
with each spigot engaging into a rubber mounting grommet contained in a bracket bolted to the subframe.

Radiator Fans

Mounting rails for the cooling fan cowling run across the top and bottom of the rear face of the radiator,
being secured by screws to the radiator sideframes, with forward extensions to carry the a.c. condenser by a
single screw at each corner. Each of the two fan motors is secured to the moulded cowling by four screws,
but cannot be removed from the cowling without first releasing the fan from the motor shaft, which operation
requires that the cowling be removed from the radiator.
Removal of the radiator exit grilles from the front clamshell provides access to the fan harness connectors
for diagnostic purposes, but for fan motor or radiator removal, it is necessary to remove the front clamshell.
To replace:
1. Remove the front clamshell (see sub-section BV.4).
2. Unplug both fan harness connectors.
3. Release the six caphead screws securing the fan cowling to the radiator rails, and withdraw complete with
the two motor assemblies.
4. Withdraw the fan from the motor shaft and release the four screws securing the fan motor to the cowl-
ing.
5. Refit in reverse order to removal.
Radiator
To replace: If only the radiator is to be replaced or serviced, it is possible to leave the a.c. condenser in situ to
avoid the requirement to recover the refrigerant:
1. Remove the front clamshell (see sub-section BV.4)
2. Remove the front undertray and radiator lower duct (note; front fixings to bumper are slotted).
3. Remove the drain plug from the radiator bottom tank, and collect coolant.
4. Disconnect inlet and outlet hoses from the radiator top tank.
5. Unplug the harness connector plug to each of the fan motors.
Section KJ
Page 6