Cooling System; Draining Coolant And Filling System With Coolant - Mercedes-Benz 209 D Operating Instructions Manual

1 Drain plug - radiator (example)
1 Drain plug - engine
50
4.3 Cooling system
Caution : Keep air intake free.
Do not attach any posters, badges or other
trim in the region in front of the radiator.
The cooling temperature 1s con trolled by
one the rmostat.
The gradual rise of the cooling tempera-
ture abo ve the usual level indicates a fail-
ure in the coo ling system .
The cause may be lack of cooling wuter, u
clogged radiator, slack V-belts or a faultv
thermostat.
Check cooling and heating system fo r
leaks at regular interva ls and renew hoses ,
if required
Radiator hoses and heater hoses should
be replaced by new ones whe n they have
been in use for an extended period of time
(approx. four years).
Use on ly tested and recommended hose
material and hose clamps.
4.3.1 Draining coolant and filling system with coolant
Draining :
1.
Remove cap of cooling water expan
sio n tank.
2. Open heater control valve.
3. Remove drain plugs.
They are located:
- at the bott om section of radiator;
- on th e right hand side of engine
After having drained the coo lant, check
whether th e drain ports are restricted by
residua l matter. Seal drain ports.
Filling with coolant:
If poss ible, replen ish coo lant only if the
coo lant temperature in the system is less
than 122° F (50° C).
Replace cap of coolant expans ion tank.
Operate engine until opera ting temper a-
ture is reached (thermostat has opened ).
Shut off eng ine and replenish coo lant.