Coolant Temp Sensor - MK5 Golf GTI

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Graham1990

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Coolant temp sensor

« on: February 02, 2018, 05:24:22 pm » Hi guys, does anyone know if there are two coolant temp sensors? If so does anyone know the part numbers? My local vw dealer are saying they don’t know if there is one or two sensors and there is only one listed on the system. Car is a 2005 mk5 gti, thanks 👍 Logged

ROH ECHT

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Re: Coolant temp sensor

« Reply #1 on: February 02, 2018, 05:33:59 pm » There should be two...one near the vacuum pump/brake booster and the other near the alternator. This may help: https://www.pelicanparts.com/techarticles/Volkswagen_Golf_GTI_Mk_V/19-WATER-Coolant_Temperature_Sensors_Replacement/19-WATER-Coolant_Temperature_Sensors_Replacement.htm Logged K04 PLAY...K04 turbo/S3 INJ. & FMIC/FORGE FMTC, TB hose, & WG actuator/GIAC's H.O. K04 & DSG TUNES/AWE DV/NEUSPEED P-FLO,TURBO OUTLET & TB pipe/AUTOTECH hpfp/BSH Eng.&Trans Mounts/H&R ARB's/Whiteline Performance springs & W.A.L.K./ECS stage-3 BBK/BILSTEIN B8's...ZOOM'DIS...GIAC K04 tune-2007 Volkswagen GTI: 12.823 @ 112.050 MPH__Voting for my Dragtimes link: http://www.dragtimes.com/Volkswagen-GTI-Timeslip-25700.html?r=1

Graham1990

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Re: Coolant temp sensor

« Reply #2 on: February 02, 2018, 05:38:34 pm » Thank you mate, I’ve replaced the main thermostat already, is there a second thermostat in the system somewhere ? The car eventually gets up to temp but it takes about 10/15 miles to. The temp creeps up extremely slowly. Logged

ROH ECHT

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Re: Coolant temp sensor

« Reply #3 on: February 02, 2018, 05:45:06 pm » Just one thermostat...check this pdf - page 18(page 14 of the document): http://www.golfmkv.com/forums/golfgoodies/mk5golfengine.pdf Logged K04 PLAY...K04 turbo/S3 INJ. & FMIC/FORGE FMTC, TB hose, & WG actuator/GIAC's H.O. K04 & DSG TUNES/AWE DV/NEUSPEED P-FLO,TURBO OUTLET & TB pipe/AUTOTECH hpfp/BSH Eng.&Trans Mounts/H&R ARB's/Whiteline Performance springs & W.A.L.K./ECS stage-3 BBK/BILSTEIN B8's...ZOOM'DIS...GIAC K04 tune-2007 Volkswagen GTI: 12.823 @ 112.050 MPH__Voting for my Dragtimes link: http://www.dragtimes.com/Volkswagen-GTI-Timeslip-25700.html?r=1

pudding

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Re: Coolant temp sensor

« Reply #4 on: February 02, 2018, 06:11:39 pm » Yeah the second sensor is the "Radiator outlet temperature" in VAG-COM. The main sensor in the front thermostat housing is what the engine uses for fuel metering. Not sure what the second one is for. Dash gauge?Some cars have more than 1 thermostat. DSG definitely has at least 2 and some manuals have 2 as well. My 07 ED30 has 1, so it's all a bit confusing. Logged 2007 ED30 | 2009 TDI 140 | 2016 BMW 330D

Graham1990

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Re: Coolant temp sensor

« Reply #5 on: February 02, 2018, 06:57:44 pm » I’ve just ordered an in line thermostat through vw so hopefully I have one lol. Apparently there is the main thermostat and then there is another one Connected to a coolant pipe under the throttle body somewhere. I’ll have a look in the morning and make sure I have one there to replace. If not I’ll have to order the coolant temp sensors. Logged

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