lupogtiboy Posted April 3, 2018 Report Share Posted April 3, 2018 03 GTI, temp sensor has no faults stored, but the gauge on the dash shows the temperature in between 70 and 90, its always sat on 90 or just a smidge below. I changed the temp sensor at the weekend, still does the same. Car runs fine, heater gets hot, thermostat opens as both pipes get hot, fan cuts in when its supposed to, coolant all fine too and up to VW spec. Any ideas? TIA Quote Link to comment Share on other sites More sharing options...
mk2 Posted April 3, 2018 Report Share Posted April 3, 2018 what's vcds read? Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted April 3, 2018 Author Report Share Posted April 3, 2018 No faults with the sensor. I used the Offboard diagnostics stuff we have here at work (main VW dealership) and didn't have any faults with the sensor. I asked the techs here what their thoughts were, and they suggested the sensor, which is what I thought too. Tested it Saturday up to temperature, both pipes got hot so thermostat is opening, and the fan came on, sensor showed 90 degrees without driving it. Soon as I drove it home, temp gauge dropped to between 70 & 90. Like I said, the car runs fine, so I must have a massively efficient radiator! Quote Link to comment Share on other sites More sharing options...
JoeyEunos Posted April 3, 2018 Report Share Posted April 3, 2018 The thermostat has failed in the 'open' position (They're designed to fail this way), seen this on a few of mine. Change the thermostat and I'll bet you the problem stops and the car will sit and stay at a steady 90 once up to running temperature 1 Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted April 3, 2018 Author Report Share Posted April 3, 2018 I'll give that a try, thanks! Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted April 3, 2018 Author Report Share Posted April 3, 2018 Thinking about it, that makes sense, though I'm glad its stuck open rather than closed as my 6N polo did! Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted April 24, 2018 Author Report Share Posted April 24, 2018 New thermostat and housing, all sorted! Thanks people! Quote Link to comment Share on other sites More sharing options...
Rich Posted April 24, 2018 Report Share Posted April 24, 2018 I've chased a broken housing before so good move on changing that as well. Quote Link to comment Share on other sites More sharing options...
cj1 Posted April 24, 2018 Report Share Posted April 24, 2018 It seems I'm the only person that had one fail closed... Quote Link to comment Share on other sites More sharing options...
lupogtiboy Posted April 25, 2018 Author Report Share Posted April 25, 2018 My 6N polo failed closed, crap design really, GTI design a lot stronger Quote Link to comment Share on other sites More sharing options...
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