ostinpawas
18-04-2007, 12:03 AM
Help.A6 avant on 53 plate(UK) just out of warranty(by 5months)..overheated yesterday on motorway(light traffic..free flowing at 70mph)..got red coolant temp/quant warning so stopped immediatley and got towed home.
Replicated the problem today by driving it for about 15 mins....fans all work etc...temp stabilised at 90C then suddenly and quickly went to 120C with warning...when car stopped temp decreased v. quickly to 90C (with fan running too).
Observed coolant reservoir bubbling..in fact it bubbles into the overflow underneath...
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OK I have changed the Thermostat now, and got same problem...have bled thoroughly etc......heater is getting hot. Temp guage stabilises at 90 and then after about 10 mins(of idle only) or when being driven the temp. guage rises rapidly towards the upper limit...(I shut down)
CAN ANYONE TELL ME WHAT'S WRONG PLEASE?
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edit... have run the car over 1 mile and though the heater is hot initially it cools down even though the temp guage is on its way up to the upper limit?...????any ideas...please.....
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Many thanks
Ostin
Replicated the problem today by driving it for about 15 mins....fans all work etc...temp stabilised at 90C then suddenly and quickly went to 120C with warning...when car stopped temp decreased v. quickly to 90C (with fan running too).
Observed coolant reservoir bubbling..in fact it bubbles into the overflow underneath...
===============
OK I have changed the Thermostat now, and got same problem...have bled thoroughly etc......heater is getting hot. Temp guage stabilises at 90 and then after about 10 mins(of idle only) or when being driven the temp. guage rises rapidly towards the upper limit...(I shut down)
CAN ANYONE TELL ME WHAT'S WRONG PLEASE?
============
edit... have run the car over 1 mile and though the heater is hot initially it cools down even though the temp guage is on its way up to the upper limit?...????any ideas...please.....
===============================
Many thanks
Ostin