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Help: Coolant System trouble shooting

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Old 10-09-2017, 10:02 AM
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Default Help: Coolant System trouble shooting

I have searched forums for 3 days now and I cannot find solid information about cooling system. I also bought manual online (alldatadiy.com).
I have a 2002 TT Quattro AWP that recently had a coolant leak.
Coolant leak is gone but gauge reads HOT when up to temperature (running about 10min). The climatronic code (
) for the coolant temp (49C) shows running temp at 98-104c, which should be good. The issue is the gauge on the dash is showing HOT. (gauge starts at zero and then pegs to "H" after 10 mins)

The CTS (coolant temp sensor) was changed and is the suspect for the odd reading. It was changed bc of a leak.
The driver's side coolant (auxiliary) fan was also changed (definitely bad and probably was the overheating culprit but not sure yet)
I also changed the thermostat because the temp gauge was going up and the lower coolant hose to the radiator was not getting hot ( I did not use the climatronic numbers at that point). I did change the thermostat with it in the vertical position.
I am at this point were I do not know if I have a over heating condition or not...or more specifically are all my components working.

Questions for anyone who can help:
What temps do the auxiliary fans kick on?
What triggers the auxiliary fans to kick on? (Specific components)
What temp should the thermostat open?
Has anyone ever had a CTS cause a bad instrument gauge reading?


Thanks in Advanced,
Eric
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Old 10-10-2017, 06:20 AM
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To the top
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Old 10-12-2017, 08:28 AM
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Thank you for the overwhelming responses.
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Old 10-15-2017, 05:17 PM
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Originally Posted by ebrock View Post
Thank you for the overwhelming responses.
how close to the "H" does yours read? My son just bought a 2002 TT and after a few min or so it is one notch below the "H". I did notice there is a recall out on the coolant system. would this fix the problem?
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Old 10-16-2017, 04:24 AM
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Looks like you've checked the usual stuff. Probably a bad dash cluster
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Old 10-17-2017, 06:45 AM
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Oh man, I hate to say it but I think it could be your cluster. I had the exact 100% same problem. Either internal (circuit board) or at the connector harness on the back, most likely the blue connector if the problem did lie there. Module Masters is a good company that you can send it off to. They have amazing support, I am extremely impatient and I was able to have several conversations with them and directly to the guy that was working on my specific dash too.
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