Cooling System Diagnosis—Diesel Engine - Mercedes-Benz 2005 Sprinter Service Manual

7 - 2 COOLING
COOLING (Continued)
DIAGNOSIS AND TESTING - COOLING SYSTEM
CONDITION
TEMPERATUREGAUGE READS
LOW
TEMPERATURE GAUGE READS
HIGH. COOLANT MAY OR MAY
NOT BE LEAKING FROM SYSTEM
COOLING SYSTEM DIAGNOSIS—DIESEL ENGINE
POSSIBLE CAUSES
1. Vehicle is equipped with a heavy
duty cooling system.
2. Temperature gauge not
connected
3. Temperature gauge connected
but not operating.
4. Coolant level low.
1. Vehicle overloaded, high ambient
(outside) temperatures with A/C
turned on, stop and go driving or
prolonged operation at idle speeds.
2. Temperature gauge not
functioning correctly.
3. Air traped in cooling
4. Radiator cap faulty.
5. Plugged A/C or radiator cooling
fins.
6. Coolant mixture incorrect.
7. Thermostat stuck shut.
8. Bug screen or winter front being
used.
9. Viscous fan drive not operating
properly.
10. Cylinder head gasket leaking.
11. Heater core leaking.
12. cooling system hoses leaking.
CORRECTION
1. None. System operating normaly.
2. Connect gauge.
3. Check gauge. Refer (Refer to 8 -
ELECTRICAL/INSTRUMENT
CLUSTER - DIAGNOSIS AND
TESTING)
4. Fill cooling system. (Refer to 7 -
COOLING - STANDARD
PROCEDURE)
1. Temporary condition, repair not
required. Notify customer of vehicle
operation instructions located in
Owners Manual.
2. Check gauge. (Refer to 8 -
ELECTRICAL/INSTRUMENT
CLUSTER - DIAGNOSIS AND
TESTING)
3. Drain cooling system (Refer to 7 -
COOLING - STANDARD
PROCEDURE) and refill (Refer to 7
- COOLING - STANDARD
PROCEDURE)
4. Replace radiator cap.
5. Clean all debre away from A/C
and radiator cooling fins.
6. Drain cooling system (Refer to 7 -
COOLING - STANDARD
PROCEDURE) refill with correct
mixture (Refer to 7 - COOLING -
STANDARD PROCEDURE).
7. Replace thermostat.
8. Remove bug screen or winter
front.
9. Check viscous fan (Refer to 7 -
COOLING/ENGINE/FAN DRIVE
VISCOUS CLUTCH - DIAGNOSIS
AND TESTING)
10. Check for leaking head gaskets
(Refer to 7 - COOLING -
DIAGNOSIS AND TESTING).
11. Replace heater core.
12. Tighten clamps or Replace
hoses.
VA