Fig. 36 Checking coolant level
1 Filler port with cap
2 Overflow
3
Coolant expansion tank
4 Radiator connection hose
5
Coolant level
A
maximum markings
(FULL)
B
minimum-markings
(LOW)
1. Check the level of coolant in the expansion tank.
Top up when the coolant level falls below the
minimum marking
B
.
2.
Close the access door.
Determine and rectify the cause of coolant loss.
10.3.1.2 Checking the coolant
The coolant should be checked according to the maintenance schedule to ensure quality and op‐
erational life.
Coolant quality can be determined by the following parameters:
■
Visual check
■ Antifreeze concentration measurement
➤ Unscrew and remove the expansion tank filler cap 1
.
Visual check
The coolant should be checked for its colour and any particles or sediments floating in it.
➤
Take a coolant sample and analyse.
The coolant should be changed if it is discoloured or has floating particles.
Antifreeze concentration measurement
An instrument (e.g. refractometer) is used to check antifreeze concentration.
Maximum frost protection is ensured with an antifreeze concentration of 55% by volume, as frost
protection and heat transfer properties deteriorate beyond this point. Higher concentration also
leads to higher operating temperature.
10 Maintenance
10.3 Engine maintenance
No.: 9_6974 20 E
Service manual Portable compressor
M122
87
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