Saab 1987 900 - Page 55

thermostatic switch. The fan is only opera-
tive
when the temperature of the radiator
coolant is higher than the cut-in tempera-
ture ofthe thermostatic switch.
The radiator fan may continue to run, or
may cut in, for a short while after the
engine has been switched off . A timer relay
limits the after-running of the radiator fan
to about 10 minutes.
WARNING!
Boiling coolant can cause serious burns.
Let the engine cool before removing pres-
sure cap. The cooling system operates
under pressure. Always open the cap on
the expansion tank slowly and allow any
steam to escape before you remove the
cap. The radiator must not be screened
or blocked off]
Car care and scheduled maintenance 53
Checking the coolant level
The expansion tank is transparent to facili-
tate checking ofthe coolant level. The level
should be between the MAX and MIN
marks on the tank .
When necessary, top up with the recom-
mended anti-freeze coolant mixture (see
below). After
an empty expansion tank has
been filled up, the engine should be run
until warm and the tank topped up again.
NOTE! Keep the coolant at the recom-
mended level. Correct any leaks imme-
diately. Operating the engine with low
coolant level may cause damage to the
cylinder head.
Changing coolant
Draining
1. Set the heater control to maximum heat.
2. Loosen the pressure cap on the expan-
sion tank.
3.
Open radiator drain cock which is loca-
ted towards the bottom of the radiator
on the right hand side.
4.
Open engine drain plug located to the
right of the engine, under the exhaust
manifold.