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  1. 07-14-2016 11:58 PM #1
    Bruno_s4
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    Coolant temp shot through the roof today and had to get it towed

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    So I've been watching the coolant temps all week with the Torque app to get a good baseline before I install the PLM Heat Exchanger.
    We have had a heat wave in Toronto and most days the coolant has been 98-101 C.
    Today as I was driving I started seeing it climb much higher.
    When it hit 123 I was very worried.
    And also something else strange happened.... my Air Conditioning was not blowing very cold anymore.
    It was warm/cool not super cold like usual.

    A minute later the cluster beeped at me to check the coolant level and turn off the car.
    The coolant was full.

    Called for a flat bed (CAA finally came in handy) and had it towed to my regular shop.
    His guesses were thermostat or water pump.
    I have another friend saying it's the coolant temp switch...

    My mechanic will dig into it Friday but was wondering if anyone here had some thoughts.

    Thanks very much.
    2010 Sprint Blue S4 DSG | Sport Diff | GIAC Stg 2 + TCU | S4Matty ported charger/throttle body | PLM | AWE Touring + Resonated DP | ECS Kohlefaser | H&R Clubsport RSS | Renn Motorsports RS-51 19 x 8.5 | Super Sports | Stoptech ST60 BBK | Endless RF650 | 034 X-Brace | CR-15 | 034 Rear Bar | 034 Rear Diff Inserts | ENLAES Spoiler | Driving Passions Diffuser| RS4 Grill | STVBEK Front Lip | Clear Corners |Philips Ultinon 6000k | G6 6500k LED Fog | FBSW | JL Audio 10W6v2 | 500/1v2 | LC2i
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  2. 07-15-2016 01:00 AM #2
    infinkc
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    Classic thermostat problem.
    There are 10 kinds of people in this world, those who know binary and those who don't.
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  3. 07-15-2016 01:09 AM #3
    Boris
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    Quote Originally Posted by infinkc View Post
    Classic thermostat problem.
    +1 ,

    have u redone the thermostat before? If not sounds like it went

    AXA     Turbo Villains
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  4. 07-15-2016 05:01 AM #4
    AKPS4
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    I just got diagnosed for a leaking coolant switch. Noticed coolant level really low. Glad I caught it before getting stuck.
    2012 S4 Monsoon Grey 6MT, Prestige, Titanium, Sport Diff., B&O, carbon fiber inlays, DIY intercooler screen, VAG-COM mods, APR Stage 2+, AWE w/ non-res DP's and cold front, Strat Intake, EuroCode F/R Sways, end links, Alu Kruez, Apikol RDM, and STS, V1 wired to SAVVY, Front end Clear Bra Cover, RS4 Grill, 19" Titaniums w/ Nitto Motivo's, 19x9.5 F14's w/ Mich. PSS, PSS10 coils
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  5. 07-15-2016 07:25 AM #5
    Bruno_s4
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    Quote Originally Posted by Boris View Post
    +1 ,

    have u redone the thermostat before? If not sounds like it went
    Yes it was done under warranty back in the summer of 2011.
    2010 Sprint Blue S4 DSG | Sport Diff | GIAC Stg 2 + TCU | S4Matty ported charger/throttle body | PLM | AWE Touring + Resonated DP | ECS Kohlefaser | H&R Clubsport RSS | Renn Motorsports RS-51 19 x 8.5 | Super Sports | Stoptech ST60 BBK | Endless RF650 | 034 X-Brace | CR-15 | 034 Rear Bar | 034 Rear Diff Inserts | ENLAES Spoiler | Driving Passions Diffuser| RS4 Grill | STVBEK Front Lip | Clear Corners |Philips Ultinon 6000k | G6 6500k LED Fog | FBSW | JL Audio 10W6v2 | 500/1v2 | LC2i
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  6. 07-15-2016 08:08 AM #6
    sacandagaD
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    Quote Originally Posted by Bruno_s4 View Post
    Yes it was done under warranty back in the summer of 2011.
    I'd be willing to bet you are going to be a two time thermostat loser,
    2015 P+, Sepang Blue, Black/Black Alcantara / DSG / Sport Diff / Tech package / OEM Euro Auto-folding mirrors / EPL stage 1 ECU/TCU / BMC Air filter and AWE Intake tube / Carbon inlays / Hard wired V1 / CR-15 / 3M PPF / 19" AdvanApexV601/Hartmann Rotor reps / Akebonos / LED interior and reverse lights / ZxE fogs / Multiple Vag-com mods

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  7. 07-15-2016 08:19 AM #7
    bokiboki
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    Quote Originally Posted by AKPS4 View Post
    I just got diagnosed for a leaking coolant switch. Noticed coolant level really low. Glad I caught it before getting stuck.
    ^Sorry for the noob question but what is coolant switch and where is it located?
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  8. 07-15-2016 05:01 PM #8
    BLACKS4-10
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    Just had this happen to me on Memorial day weekend when going in for my yearly inspection..thermostat for sure..big issue with this car
    2010 S4 Brilliant Black- Black/Magma Nappa-Prestige-B&O-Carbon Atlas inlays-DSG-Nav/camera-35% Solar Gard tints-APR Exhaust-Eurocode Alu-Kruez stabilizer-Tyrolsport RCS kitEurocode Trufit intake-ECS 2-piece lightweight front and rear rotors with Akebono Euro pads=H&R rear sway bar
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  9. 07-15-2016 05:40 PM #9
    KnewJack
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    Does this affect B8.5?
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