temp gauge error, '99 A6

Huw Powell audi at humanspeakers.com
Fri Jul 1 19:08:05 PDT 2011

You could run it by your mechanic when it's warm and measure the temps 
with an IR thermometer when the needle goes/light starts flashing if you 
want to reassure yourself for the trip.  If it turns out that it *is* 
overheating, well it'll be where it needs to be to get fixed while you 
are away...


On 7/1/2011 3:23 PM, Lee Levitt wrote:
> A quick question...
> My mechanic replaced the coolant overflow tank on my '99 A6 this week.
> Not long after, my daughter reported that the car was overheating --
> coolant temp gauge almost in the red and a warning on the dash. Oil temp
> was normal. No other signs of an issue.
> After sitting overnight, upon starting, the engine coolant gauge showed
> 3/4 hot. Shouldn't it read cold on a cold start?
> Does this sound like a sending unit or wiring issue rather than
> something more ominous?
> Thoughts appreciated. We're taking a road trip tomorrow and I'd prefer
> to take this car rather than the others...but not if there's any
> question about the cooling system.
> Much appreciated.
> The car will go back to my mechanic on Tuesday for a formal inquisition.
> By the way, the car is black, if that makes a difference. :)
> Lee
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