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  1. #1
    Active Member Two Rings
    Join Date
    Jun 05 2004
    AZ Member #

    1.8T taking a long time to reach optimal coolant tempature.

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    I recently had my oil cooler fail, which caused oil to leak into the coolant track. To resolve that issue, my mechanic replaced the oil cooler and flushed/replaced the coolant. Now the issue I have is that coolant temperature takes 2x to 3x as long to reach optimal operating temps. How can I tell if it's my thermostat that needs replacing or a temp sensor?

    I also have the following engine code showing up in a VCDS scan...

    18613 - Performance Malfunction in Cooling System
    P2181 - 008 -

  2. #2
    Veteran Member Four Rings old guy's Avatar
    Join Date
    Dec 28 2006
    AZ Member #
    My Garage
    '03 A4, '13 A5, '18 MB-GLA
    Western Maryland

    This should help: Clicky clickŪ
    A4 Motoza tuned Frankenturbo F21L / Bosch 550's / 3" MAF / TyrolSport SMIC / 034 HFC / TT 2.5" DP / Borla / Eibach ProKit / Koni Yellows / H-Sport F&R Bars / TyrolSport Brake Stiffeners / HyperShift Short Shifter / Podi
    A5 Mods to come: Little stuff so far. 20/25mm spacers / H&R OE Sport springs / 35% tint / Neuspeed Power Module / black window trim / RS grille.


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