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However, However, a mechanical a mechanicalV olkswagencoolingsystemsThecoolingsystememploysavarietyofstrategies,buttwoofthose Volkswagencoolingsystemscanseema beforebefore it was it evenwas even pulled pulled intointoa service a service bay.bay.This This cancanfailurefailure of ablendof a blend door door could could notbenot completely be completely ruled ruledcan seem a bit like a maze atbit like a maze at times, with hoses teeingstrategiesweremostpertinenttothisdiagnosis:EngineWarmingand DOVR\x03DOVR\x03EH\x03D\x03EH\x03 UVW\x03 GHIHQVH\x03 WKH\x03 WKH\x03GUHDGHG\x03\x05HYHU\x03\x05HYHU\x03 out just yet. most plausible explanation based based with hoses teeing off of UVW\x03D\x03 OLQH\x03OLQH\x03RI\x03 RI\x03GHIHQVH\x03WR\x03 WR\x03GUHDGHG\x03 outjustyet.TheThemost plausibleexplanationtimes,of a Volkswagen GTIan AutomotiveTechInfo.com publication VLQFH\x05\x03V\\QGURPH\x11\x03 on theGTIwasunremarkable.on available R\x03RI\x03HDFK\x03RWKHU\x03DQG\x03URXWLQJ\x03HYHU\\\x03ZKLFK\x03 Independent Heating. Engine Warming takes place during a cold start. VLQFH\x05\x03V\\QGURPH\x11\x03 on available information information was wasa blockage, a blockage, restriction, restriction,eachotherandroutingevery 7KH\x03URWDU\\\x03VOLGH\x03YDOYHV\x03LQ\x03WKH\x03WHPSHUDWXUH\x03DFWXDWRU\x03UHVWULFW\x03FRRODQW\x03RZ\x0f\x03ZD\\\x03XQGHU\x03WKH\x03KRRG\x11\x037KH\x03RZ\x03GLDJUDP\x03LQ\x03RU\x03RWKHU\x03W\\SH\x03RI\x03FRRODQW\x03RZ\x03LVVXH\x11\x03 whichwayunderthehood. The Thepre-scanpre-scanonthe GTIwasunremarkable. RU\x03RWKHU\x03W\\SH\x03RI\x03FRRODQW\x03RZ\x03LVVXH\x11\x03 serviceinformationfurthercementstheallowing the engine to reach closed loop operating temperatures as quickly Theflowdiagraminserviceaspossible.Thiscontributestoloweredemissionsandincreasedfuel With No Heat ThereThere were were a couple a couple of low of voltagelow voltage codes, codes, a heated a heatedfeeling of being lost in a maze full of twistsHFRQRP\\\x11\x037KH\x03FRRODQW\x03VKXW\x10R\x03YDOYHV\x03DUH\x03FORVHG\x03GXULQJ\x03WKH\x03ZDUPLQJ\x03SKDVH\x03informationfurthercements passenger seatseatfault, fault, code satelliteand turns and dead ends. passenger andandoneonecode fortheforsatellitethethefeelingofbeinglostinaDV\x03ZHOO\x11\x03$IWHU\x03VXFLHQW\x03KHDWLQJ\x03RI\x03WKH\x03HQJLQH\x0f\x03WKH\x03WUDQVPLVVLRQ\x03FRRODQW\x03storedinthe theInformationElectronicsThismazefulloftwistsandturnsVKXW\x10R\x03YDOYH\x03RSHQV\x0f\x03DQG\x03WKH\x03URWDU\\\x03VOLGHV\x03PRYH\x03WR\x03DOORZ\x03IXOO\x03RZ\x03WKURXJK\x03radioradiotunertuner storedinInformation ElectronicsModuleModule(this(this faultispresentanytime satellitemazeismadeevenmorecomplex faultispresentanytimethe thesatellite EHFDXVH\x03 and dead ends.GHSHQGLQJ\x03 the radiator. radio subscription has lapsed).WKH\x03 RZ\x03 FDQ\x03 PRUSK\x03radio subscription has lapsed).onenginetemperatureandoperating This maze is made even moreThe Independent Heating strategy kicks in when a heat setting is selected WR\x03HYDOXDWH\x03WKH\x03 WKH\x03SUHYLRXV\x03UHSDLUV\x03UHSDLUV\x03 FRQGLWLRQV\x11\x03 6HUYLFH\x03 LQIRUPDWLRQ\x03 LV\x03 HDVLO\\\x037KH\x037KH\x03UVW\x03UVW\x03VWHS\x03VWHS\x03ZDV\x03ZDV\x03WR\x03HYDOXDWH\x03 SUHYLRXV\x03 E\\\x03 WKH\x03 GULYHU\x11\x03 ,Q\x03 WKLV\x03 VFHQDULR\x03 WKH\x03 1\x1b\x15\x03 FRRODQW\x03 VKXWR\x03 YDOYH\x03 ZLOO\x03 EH\x03and andthecurrentstatestatethe coolingsystem.TheTheforgotten,complex because the flow canCooling SystemRSHQHG\x0f\x03DOORZLQJ\x03FRRODQW\x03RZ\x03WKURXJK\x03WKH\x03KHDWHU\x03FRUH\x03WR\x03PHHW\x03WKH\x03FDELQ\x03thecurrent ofofthecoolingsystem. but is just what was needed in)ORZ\x03'LDJUDPthis casemorphdependingonengineaheating demands. The electric coolant recirculation pump may also be coreinstallationlookedgood. leaksto gain a clear understanding of heaterheatercoreinstallation lookedgood.No No leaksVolkswagencoolingsystemscanseemThecoolingsystememploysavarietyofstrategies,buttwoofthose temperatureandoperatingstrategies were ed On. to this diagnosis: Engine Warming and appeared under under the dash the dash and alland panels all panels were were in their in theirthe cooling system components and theorymost pertinentappeared bit like a maze at times, with hoses teeing commandplace.place.TheThecoolantlevelwaswasfullinthe expansion conditions.Serviceinforma- Independent Heating. 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Of course, if a vehicle wont start it has to be towedcasetogainaclearunder- HFRQRP\\\x11\x037KH\x03FRRODQW\x03VKXW\x10R\x03YDOYHV\x03DUH\x03FORVHG\x03GXULQJ\x03WKH\x03ZDUPLQJ\x03SKDVH\x03and turns and dead ends.DV\x03 start with can be done with a scan tool from the front seat of the vehicle.GLUHFW\x03FRRODQW\x03RZ\x03DQG\x03KRXVHV\x03WKH\x03WRRWKHG\x03EHOW\x10GULYHQ\x03FRRODQW\x03SXPS\x03DQG\x03 ZHOO\x11\x03$IWHU\x03VXFLHQW\x03KHDWLQJ\x03RI\x03WKH\x03HQJLQH\x0f\x03WKH\x03WUDQVPLVVLRQ\x03FRRODQW\x03to the shop, but customers will often ignore a warning lightWhileWhile on the ontopicthe topic of the ofexpansionthe expansion tank tank there there is a is astanding of the cooling system ThismazeismadeevenmorecomplexVKXW\x10R\x03YDOYH\x03RSHQV\x0f\x03DQG\x03WKH\x03URWDU\\\x03VOLGHV\x03PRYH\x03WR\x03DOORZ\x03IXOO\x03RZ\x03WKURXJK\x03thermostat wax capsule. or unusual noise for as long as they can. This was the case onVLGH\x03VLGH\x03 componentsandtheoryof$FWLRQ\x033ODQ\x033ULRULW\\\x03/LVW\x1dQRWH\x03QRWH\x03ZRUWK\x03ZRUWK\x03PHQWLRQLQJ\x1d\x03PHQWLRQLQJ\x1d\x03VRPH\x03VRPH\x039$*\x039$*\x03YHKLFOHV\x03YHKLFOHV\x03KDYH\x03KDYH\x03 the radiator. EHFDXVH\x03 WKH\x03 RZ\x03 FDQ\x03 PRUSK\x03 GHSHQGLQJ\x03a silicaa silica bag locatedbag located inside inside thetank.the tank. The Thebag isbag there is thereoperation. temperatureandoperating5XQ\x03WKH\x03EOHQG\x03GRRU\x03FDOLEUDWLRQ\x03LQ\x03%DVLF\x036HWWLQJV\x03WR\x03YHULI\\\x03RSHUDWLRQ\x03our 2015 Golf GTI subject vehicle. The service message wasonengine There is also an electric after-run coolant pump, a recirculation pump, andThe Independent Heating strategy kicks in when a heat setting is selected to extend thelifetheoflife the the coolant corrosiveFRQGLWLRQV\x11\x03 6HUYLFH\x03 LQIRUPDWLRQ\x03 LV\x03 HDVLO\\\x03 DQG\x03FRQUP\x03QR\x03IDXOW\x03FRGHV\x03VHW\x11\x030RQLWRU\x03VSHFLHG\x03DQG\x03DFWXDO\x03YDOXHV\x03RI\x03long overdue, and the telltale squeal from the rear wheelsto extendofcoolant andandtraptrapcorrosiveWZR\x03FRRODQW\x03VKXWR\x03YDOYHV\x03LQ\x03WKH\x03V\\VWHP\x11\x032QH\x03RI\x03WKH\x03VKXWR\x03YDOYHV\x03LV\x03RQ\x03WKH\x03 E\\\x03 WKH\x03 GULYHU\x11\x03 ,Q\x03 WKLV\x03 VFHQDULR\x03 WKH\x03 1\x1b\x15\x03 FRRODQW\x03 VKXWR\x03 YDOYH\x03 ZLOO\x03 EH\x03Theheartofthethermalmanagementsystemisthe contaminants. This This is all is well allwelland goodand good until until the bag thebagCooling SystemRSHQHG\x0f\x03DOORZLQJ\x03FRRODQW\x03RZ\x03WKURXJK\x03WKH\x03KHDWHU\x03FRUH\x03WR\x03PHHW\x03WKH\x03FDELQ\x03contaminants. forgotten, but is just what was needed inthe temperature doors in live data.said that the brakes were also in need of attention. Neither)ORZ\x03'LDJUDPinlet side of the heater core, and the other is for the transmission cooler on UXSWXUHV\x03 N493enginetemperaturecontrolactuator,whichheating demands. The electric coolant recirculation pump may also be of those items was in the work order though, only a poorUXSWXUHV\x03DQG\x03VHQGV\x03DQG\x03VHQGV\x03QH\x03JUDLQV\x03QH\x03JUDLQV\x03RI\x03VLOLFDWH\x03RI\x03VLOLFDWH\x03WKURXJKRXW\x03WKURXJKRXW\x03 this case to gain a clear understanding of YHKLFOHV\x03HTXLSSHG\x03ZLWK\x03D\x03'6*\x03DXWRPDWLF\x03WUDQVPLVVLRQ\x11 commanded On. utilizes two rotary slide valves to direct coolant flow and the cooling system, wreaking havoc along the way.the cooling system components and theory heating complaint was listed.the cooling system, wreaking havoc along the way.of operation.houses the toothed belt-driven coolant pump and ther- :LWK\x03 Sample Rate: 8.0 - FRRODQW\x03RZ\x03 VCDS RSHUDWLQJ\x03 StopD\x03FOHDU\x03XQGHUVWDQGLQJ\x03RI\x03 DQG\x03WKH\x03GLHUHQW\x03The owner of the GTI reported that it wasnt until halfway core core is particularly susceptible to silica TheheartEngineof the thermal management system, it was time to create an action The Theheater heateris particularly susceptible to silicamostat wax capsule.managementsystemistheN493enginemodes Label File: 06K-907-425-V1.CLB Basic Settingsofthethermal Engine inletthrough his nearly hour-long commute to work that there wasblockage, tosmall capillarypassages.temperatureoutputSODQ\x03VWDUWLQJ\x03ZLWK\x03WKH\x03OHDVW\x03LQYDVLYH\x03WHVWV\x03UVW\x11\x037\\SLFDOO\\\x0f\x03WKH\x03EHVW\x03WHVWV\x03WR\x03blockage, duedueto the the small capillary passages. TheTheTemperaturecontrolactuator,whichutilizestworotaryslidevalvestoIDE05231-Engine temperature management actuatorbag bagseemsseems mostsusceptibletoleburstingwhenwhen theThere is also an electric after-run coolant pump, a recir- start with can be done with a scan tool from the front seat of the vehicle. GLUHFW\x03FRRODQW\x03RZ\x03DQG\x03KRXVHV\x03WKH\x03WRRWKHG\x03EHOW\x10GULYHQ\x03FRRODQW\x03SXPS\x03DQG\x03mostsusceptib tobursting thecontrol of QDOO\\\x03KHDW\x03IURP\x03WKH\x03YHQWV\x11\x03$OO\x03RWKHU\x03IXQFWLRQV\x0f\x03OLNH\x03WKH\x03EORZHU\x03 thermostat wax capsule. isoverheated,asoarupturedpouchthe actuatorFinished correctly I engineengineisoverheated, so ruptured silicasilica pouchculation pump, and two coolant shutoff valves in the$FWLRQ\x033ODQ\x033ULRULW\\\x03/LVW\x1dGo!speeds and mode selection, worked correctlyjust no heat.motor N493 5XQ\x03WKH\x03EOHQG\x03GRRU\x03FDOLEUDWLRQ\x03LQ\x03%DVLF\x036HWWLQJV\x03WR\x03YHULI\\\x03RSHUDWLRQ\x03shouldshould be viewed be viewed as aassecondary a secondary problem, problem, with with thethesystem. also an electric after-run coolant pump, a recirculation pump, and There is One of the shutoff valves is on the inlet side of Rotary slide 2WZR\x03FRRODQW\x03VKXWR\x03YDOYHV\x03LQ\x03WKH\x03V\\VWHP\x11\x032QH\x03RI\x03WKH\x03VKXWR\x03YDOYHV\x03LV\x03RQ\x03WKH\x03 DQG\x03FRQUP\x03QR\x03IDXOW\x03FRGHV\x03VHW\x11\x030RQLWRU\x03Done, Go BackVSHFLHG\x03DQG\x03DFWXDO\x03YDOXHV\x03RI\x03Show Measuring Data$\x03 WKRURXJK\x03 FXVWRPHU\x03 LQWHUYLHZ\x03 XQFRYHUHG\x03 PRUH\x03 RI\x03 WKH\x03 VWRU\\\x11\x03 7KH\x03 primaryprimaryreasonforoverheating stillstilltotodeter- - the heater core, and the other is for the transmissionthe temperature doors in live data.reason foroverheatingbe bedeterinlet side of the heater core, and the other is for the transmission cooler onofbag is indicatedby YHKLFOHV\x03HTXLSSHG\x03ZLWK\x03D\x03'6*\x03DXWRPDWLF\x03WUDQVPLVVLRQ\x11V\\PSWRPV\x03KDG\x03EHHQ\x03SUHVHQW\x03IRU\x03D\x03IHZ\x03ZHHNV\x03QRZ\x0f\x03DQG\x03D\x03GLHUHQW\x03UHSDLU\x03 mined.mined. TheThepresence presence of the the bag is indicated by the thecooleronvehiclesequippedwithaDSGautomaticN493 Basic Settingshop had replaced the heater core a few days ago. The new heater coreZRUGV\x03ZRUGV\x03\x05PLW\x03\x05PLW\x036LOLNDW\x05\x036LOLNDW\x05\x03SULQWHGSULQWHG\x03RQ\x03WKH\x03\x03RQ\x03VLGH\x03WKH\x03VLGH\x03RI\x03WKH\x03RI\x03WDQN\x0f\x03WKH\x03WDQN\x0f\x03 transmission. Supply toSample Rate: 8.0 -radiator VCDS Stophad not improved the situation at all, and now the owner did not haveZKLFK\x03LV\x03*HUPDQ\x03IRU\x03\x05ZLWK\x03VLOLFDWH\x11\x05 EngineEngine inlet Label File: 06K-907-425-V1.CLB Basic SettingsZKLFK\x03LV\x03*HUPDQ\x03IRU\x03\x05ZLWK\x03VLOLFDWH\x11\x05 output VCDSDQ\\\x03FRQGHQFH\x03OHIW\x03LQ\x03WKH\x03RULJLQDO\x03VKRS\x11\x03 TemperatureIDE05231-Engine temperature management actuatorQRW\x03VXHULQJ\x03IURP\x03IURP\x03VLOLFDWH\x03VLOLFDWH\x03 7KLV\x037KLV\x03*7,\x03*7,\x03KDWFKEDFN\x03KDWFKEDFN\x03ZDV\x03ZDV\x03QRW\x03VXHULQJ\x03 control ofAdvanced Measuring Values$IWHU\x03 UHDVVXULQJ\x03 WKH\x03 RZQHU\x03 WKDW\x03 WKH\x03 SUREOHP\x03 ZRXOG\x03 EH\x03 FRUUHFWO\\\x03 blockagethough,therehadhadtotobesome Expansion Tank with Silica the actuatorSample Rate: Turbo!blockage though,so sothere besomeotherotherExpansion Tank with Silica motor N493 Go! 1.3 Finished correctly I diagnosed,andonlynecessarypartswouldbeinstalled,thevehiclethelackofofheat.Beginningafull Rotary slide 2reasonreasonfortheforlack heat.Beginning withwithafullShow Measuring Data Done, Go Backsystemsystem perspe perspectivective and reviewingand reviewing the data the data known known so soGroup UDS requestscheck-in process was completed and the hatchback was dispatched to theG32 EngineN493 Basic Settingfar would provide a clear path for the diagnosis.CoverCover G32 EngineSupply toLoc. Description Actualshops European specialist. Part of the check-in process was a pre-scanfar would provide a clear path for the diagnosis.Coolant LevelBackradiatorCoolant Level The Theheaterheater waswas new, buthad had made noCoolantSensorSensor VCDSofallmodulespresentof theIDE. Coolant temperature 106 Ccorecore new,but ititmadeno Coolantoil onthevehicle.Thisisimprovement tothe the ofcabinheat.heat.ThereExpansionCoolantIDE. Coolant temperature at radiator outlet: actual. 22.9 Cimprovementto lacklack ofcabin ThereExpansionCoolantAdvanced Measuring ValuesapracticethatshopsTankTank cooler IDE. 1.3 Coolant temperature at engine outlet: specifie. 106.5 Cfault codes present related to the the engine, Sample Rate: Turbo!werewere nono fault codes present related toengine,ReturnReturnshouldthinkaboutBelt drive IDE. Coolant shut-off valve OpenRU\x03+9$&\x03FRPSRQHQWV\x11\x037KHUH\x037KHUH\x03ZHUH\x03ZHUH\x03FRROLQJ\x03FRROLQJ\x03V\\VWHPV\\VWHP\x0f\x03RU\x03\x0f\x03+9$&\x03FRPSRQHQWV\x11\x03 Group UDS requestsadopting if they are notSilicate SilicateIDE. Coolant circulation pump: activation 10.00 %nooverheating concerns, sotheso thecoolingsystemGearCoolant pump Loc. Description Actualnooverheatingconcerns,coolingsystem Container Back DOUHDG\\\x11\x03$\x03SUH\x10VFDQ\x03GRQH\x03 Container worm RotaryIDE. IDE. Transmission coolant valve 106 C Openappearedtobeworkingcorrectlyfromthe appeared tobeworkingcorrectly apartapart from theof theCoolant temperatureintheparkinglotbyaoilslide 1 Back heating,IDE. IDE. Heater support pump: spec. value 22.9 C 65.11% heating concern.Coolant temperature at radiator outlet: actual.heating concern.SilicateSilicate cooler turbocharger VHUYLFH\x03 ZULWHU\x03 RU\x03 RFH\x03 and gearbox IDE. Coolant temperature at engine outlet: specifie. 106.5 CThereThere was wasthepossibilitythe possibility thatthata blend a blend door door actuator actuatorBack radiator Belt drive IDE. Graph Log Save Done, Go BackassistantishelpfultoCoolantCoolant shut-off valve OpenCoolant N493 Temperature Control Actuator Cross View ZDV\x03ZDV\x03QRW\x03DOORZLQJ\x03 EH\x03 EH\x03GLUHFWHG\x03DFURVV\x03DFURVV\x03WKH\x03 WKH\x03 GearCoolant pump IDE. Coolant circulation pump: activation 10.00 %the technician, but moreQRW\x03DOORZLQJ\x03DLURZ\x03DLURZ\x03WR\x03 WR\x03GLUHFWHG\x03 Supply Rotary&RRODQW\x036HQVRUV\x03\x036KXW\x102\x039DOYHV\x03/LYH\x03'DWD(Image Courtesy Volkswagen)heaterheatermatrix,butbutwithout fault codesintheSupply slide 1 Back heating, importantly, it providesmatrix, withoutanyanyfaultcodesinthe worm IDE. Transmission coolant valve Open+9$&\x03+9$&\x03FRQWUROOHU\x03FRQWUROOHU\x03RU\x03 WHOOWDOH\x03 Expansion Tank - Cross ViewturbochargerIDE. Heater support pump: spec. value 65.11% OriginalinsurancefortheshopRU\x03 WHOOWDOH\x03FOLFNLQJ\x03FOLFNLQJ\x03VRXQGV\x03VRXQGV\x03IURP\x03IURP\x03 Expansion Tank - Cross Viewand gearboxwithinwithin the depths the depths of the of dashboard, the dashboard, that thatdid not did seem not seem(Image Courtesy Volkswagen) Back radiator Graph Log Save Done, Go BackN82 Valve 2015 VW Golf GTI 2.0L Turbo to have a dated and time(Image Courtesy Volkswagen) N493 Temperature Control Actuator Cross View (Image Courtesy Volkswagen) &RRODQW\x036HQVRUV\x03\x036KXW\x102\x039DOYHV\x03/LYH\x03'DWD30"