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Engine temp drops while driving.

gedi Jul 12, 2012

  1. gedi

    gedi Member

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    Hi I noticed funny thing on my car(its 98 1.8 SE) while driving at about 50-70 mph engine temp gauge drops to about 70 but when i stop in few mins it goes back to 90 and will drop again if start driving for a few miles at same speed. Thermostat was changed a while ago cause wasnt closing. what else could it be? Faulty thermostat temp sensor or viscous fan? Thanx for any help.
     
  2. aragorn

    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    Your new thermostat is ****, i've had the same issue fitting cheap ones.

    Fit a new genuine Audi stat and the problem will go away.
     
  3. gedi

    gedi Member

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    thats probably true cause i got it quite cheap as even suprised by the price. Need to order new one. thanx aragorn
     
  4. Nessy

    Nessy VW + Audi mad

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    Yes, its the thermostat.
    Get a Genuine Audi one (they are made by Behr IIRC), but don't expect even that to last forever.
    I replaced mine in February , only 3 years/ just over 30k miles after the last one.
    Both times it was a Genuine part, was surprised how short a lifespan the last one had.....
     

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