Operation CHARM
: Car repair manuals for everyone.
Home
>>
Mercedes Benz
>>
1982
>>
300SD (126.120) L5-3.0L DSL Turbo (617.951)
>>
Repair and Diagnosis
>>
Heating and Air Conditioning
>>
Testing and Inspection
>>
Symptom Related Diagnostic Procedures
>>
Heater Fails at High Engine Speeds
Heater Fails at High Engine Speeds
COMPLAINT
:
Heater fails at high engine speeds
Cause/Remedy
:
Monovalve
(11) sticks due to torn diaphragms. Coolant circuit may be contaminated.
Replace
monovalve
insert.
Flush out coolant circuit if necessary.