1-131-13THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)THDC / THDCP - 954 / 955 / 974 (Rev. 06/03)
PPrroobblleem m CCaauusse e CCoorrrreeccttiioonn
8. 8. CooCoolalant nt losloss -s -
ExternalExternal
(Continued)(Continued)
55. . EEnnggiinne e iis s oovveerrhheeaattiinngg. . 55. . RReeffeer r tto o PPrroobblleemms s 99. . aannd d 1100. . ooff
this troubleshooting chart.this troubleshooting chart.
6. 6. ContContact a Cact a Cummummins Ains Authoruthorizedized
Repair Facility.Repair Facility.
9. 9. CoolCoolant ant temptempera-era-
ture above normalture above normal
(gradual overheat)(gradual overheat)
1. 1. CoolCoolant lant level evel is lis lowow..
2. 2. CharCharge air coolge air cooler finser fins, radia, radiator fintor fins,s,
or air conditioner condenser finsor air conditioner condenser fins
are damaged or obstructed withare damaged or obstructed with
debris, insects, dirt, etc.debris, insects, dirt, etc.
3. 3. RadiRadiator hator hoses oses are care collaollapsedpsed,,
restrirestricted or cted or leaking.leaking.
4. 4. Fan drFan drive beive belt or wlt or water puater pump belmp belt ist is
loose.loose.
5. 5. IncoIncorrerrect ct oil oil levlevel.el.
6. 6. CoolCooling faing fan shrn shroud is oud is damadamaged.ged.
7. 7. RadiRadiator cator cap is iap is incorncorrecrect ort or
defective.defective.
8. 8. OverconcOverconcentration entration of of antifreezantifreezee
and / or supplemental coolant addi-and / or supplemental coolant addi-
tives.tives.
9. 9. DefeDefectictive wve water ater pumppump..
10.10. DefectiDefective thermve thermostat.ostat.
1. 1. InspInspect tect the engihe engine and cone and coolinoling sysg sys--
tem for extem for external leakternal leaks. s. Repair asRepair as
required. required. Add coolant Add coolant as requias required.red.
2. 2. InspInspect thect the charge aie charge air coolr coolerer, air, air
conditioner condenserconditioner condenser, , and and radiatorradiator
fins. fins. Clean or rClean or repair as repair as required.equired.
3. 3. InspInspect anect and repaid repair radir radiator hoator hosesses..
4. 4. ChecCheck belk belt tenst tension and tion and tightighten ifen if
necessary.necessary.
5. 5. Add or dAdd or drairain enginn engine oil ae oil as reqs requiruired.ed.
6. 6. InspInspect sect shroudhroud; repa; repair or rir or replaceplace.e.
7. 7. ReplReplace wiace with corth correct rrect radiatadiator capor cap
(15 psi).(15 psi).
8. 8. Use tUse the corhe correcrect antit antifrefreeze coneze con--
centration (refer to the engine op-centration (refer to the engine op-
eration and maintenance manual).eration and maintenance manual).
9. 9. ReplReplace ace watewater r pumppump..
10. Replace 10. Replace thermostthermostat.at.
11. Contact a Cummins Authorized11. Contact a Cummins Authorized
Repair Facility.Repair Facility.
10.10. CoolCoolant temperaant tempera--
ture above normalture above normal
(sudden overheat)(sudden overheat)
continuedcontinued
1. 1. ElectroniElectronic fc fault cault codes arodes are acte active.ive.
2.2. CoolanCoolant temperatt temperature sensor mal-ure sensor mal-
function.function.
3. 3. CoolCoolant lant level evel is lis lowow..
4. 4. RadiRadiator hator hoses oses are care collaollapsedpsed,,
restrirestricted, or cted, or leaking.leaking.
5. 5. Fan drFan drive bive belt elt is bis brokeroken.n.
6. 6. CharCharge air coolge air cooler finser fins, radia, radiator fintor fins,s,
or air conditioner condenser finsor air conditioner condenser fins
are damaged or obstructed withare damaged or obstructed with
debris, insects, dirt, etc.debris, insects, dirt, etc.
7. 7. RadiRadiator cator cap is incap is incorrorrect or defect or defec-ec-
tive.tive.
1. 1. ReRefer fer to to thetheQSM11 Fault CodeQSM11 Fault Code
InformationInformationchart in this section.chart in this section.
2.2. Check / clean Check / clean sensor and sensor and cool-cool-
ant passage.ant passage.
3. 3. InspInspect fect for exor externternal leal leaks onaks on
engine and radiator, and makeengine and radiator, and make
repairs.repairs.
4. 4. InspInspect anect and repaid repair radir radiator hoator hosesses..
5. 5. ReplReplace ace dridrive ve beltbelt..
6. 6. InspInspect thect the charge charge air coole air coolerer, air, air
conditioner condenserconditioner condenser, , and and radiatorradiator
fins. fins. Clean or rClean or repair as repair as required.equired.
7. 7. ReplReplace wiace with corth correct rrect radiatadiator capor cap
(15 psi).(15 psi).
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