Lotus Elise S1 Service Notes page 341

I Lotus Service Notes Section JH
4. Release the front end of the LH front wheelarch liner, to provide access to the radiator outlet hose bleed
screw. Pressurise the system to 35 kPa (5 lbf/in
2
) and open the radiator hose bleed screw until a steady
stream of coolant flows. Tighten the bleed screw.
5. Remove the pressure test equipment and top up the header tank to the cold level. With the header tank
cap removed, start and run the engine at idle until the water temperature gauge reads 60 - 65°C. In-
crease engine speed to 2000 rpm and observe the temperature gauge which should indicate 93 - 98°C
before dropping to 90°C due to the action of the thermostat and the circulation of air pockets. After a
further rise and fall of indicated temperature, re-bleed at the radiator hose with the engine running.
6. Continue to run the engine at 2000 rpm until the radiator return pipe at the engine feels hot, at which time
the header tank cap should be replaced. Check that the radiator fan cuts in at 103 - 105°C and brings
down the temperature to 90 - 95°C, before the cycle repeats.
7. Stop the engine and allow to cool fully before topping up the header tank to the 'low' mark.
KF.4 - RADIATOR & COOLING FAN
The aluminium cored radiator is mounted horizontally via four screws to a composite moulding which is
itself secured to the top of the 'crash structure
1
, and also provides mounting points for the front clamshell. A
single electric cooling fan is secured directly to the underside of the radiator, and is accessible only after
removal of the radiator.
To Remove Radiator
1. Remove the front clamshell (see sub-section BN.4).
2. Drain the coolant and disconnect the feed and return hoses from the radiator.
3. Release the five fixings securing the water shield to the top rear edge of the radiator mounting panel, and
withdraw the shield.
4. Release the tie wraps, and unplug the rad. fan harness connector.
5. Release the eight fixings securing the radiator mounting panel to the crash structure; three along the front
edge, three along the rear, and one smaller self tapping screw at the lower edge of each side lower edge.
Lift away the panel complete with the radiator and fan.
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