Thermostat

**coup80** · 08-11-2010,07:22 PM

Hi got a new thermostat fitted to my a4 1.9 tdi the other day because temp gauge wast only sitting at 70,now it sits bang on 90 but after driving about 60 mile coolant warning came on so i stopped and it was low so topped it up and caried on by time i got home it had only went down a tiny bit,following day i did same journey and coolant went down in reservoir about half inch,now few days later its not going down atall,it whent back to garage this morning and he told me theres no leaks it must of been an air lock thats caused it to drop.
Does this sound possible as iam a bit nervous about letting girlfriend loose in car if its needing topped up,seems ok now

**yaman** · 08-11-2010,08:19 PM

Sounds like it wasn't bled properly, after
fitting the stat.

Regards
Jim

**coup80** · 12-11-2010,05:24 PM

Help since my last post car has been back to garage twice and they keep telling me the work they done when fitting the thermostat is not leaking,yet every day the water in reservoir is dropping about a inch,which never happened before i got new thermostat fitted

**coup80** · 12-11-2010,05:32 PM

If i put that rad weld through the system does anybody think that would work?

**bez101** · 12-11-2010,07:28 PM

dont use radweld
find out where your problem is and repair
did it leak any fluid b4 the stat was changed ?
if not id be back again and again till they sorted the problem
or pay a diff garage to sort it
worst thing to have in this weather is a coolant leak

**coup80** · 12-11-2010,08:11 PM

it never leaked before the thermostat was changed,the problem is when i take it back they drive it a few miles about town and level doesnt drop atall in reservoir so they tell me its fine,then i go drive car for 1 - 2 hours and level drops about inch do that a few days and coolant warnings back on and reservoirs almost empty,how can it leak after stat change its just a o ring seal around it isnt it

**bez101** · 12-11-2010,08:20 PM

did you have the stat done or the CTS
the CTS is at the back of the engine
stat at side

**coup80** · 12-11-2010,08:26 PM

it was the stat ,i love this car,best car ive ever owned just silly things like this are really starting to annoy me,but your right really need to get this sorted as weathers getting nasty

stchris356 · 12-11-2010,11:07 PM

The system needs pressure testing (quick job) but I'd get another garage to do it and don't mention about the stat , let them come to their own conclusion, this should be about half hour labour!
It could well be an air lock, does your heater blow hot air when demanded?

**coup80** · 13-11-2010,01:05 AM

hi heaters work fine evrything seems normal,its not loosing much fluid but through time ie 3 4 days levels dropping enough for coolant warning to come on