Chevrolet Low Cab Forward 2023 Manual page 126

Symptom
Black exhaust smoke
Engine is overheating
Cause
Engine Control system faulty
Air cleaner clogged
Fuel system faulty
Exhaust system clogged
Diesel particulate filter (DPF)
faulty
No engine coolant
Front of radiator is clogged
with dirt
Sub tank pressure cap not
sufficiently tightened
Fan belt loose
Engine coolant dirty
Fan clutch faulty
Sub tank pressure cap dirty or
faulty
Driving and Operating
Corrective Action
Add engine coolant
Wash clean with tap water
Make sure it is firmly
tightened or replace the sub
tank pressure cap
Adjust the tension or replace
the belt
Clean or replace
125
Reference
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See Engine Coolant
0 203
See Exterior Care 0 253
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See Engine Drive Belt
Routing 0 298
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