My UrS6 overheated last night.

[popdemonic]

Yesterday I went to the shopping mall to finish some stuff.I let the car off for 1/2 hour. After I had been finished everything.I started the car and was leaving the mall.
The car had been sitting on the line for 1/2 hour to return the parking ticket.then I noticed that the coolant needle is creeped up from 90 C (operating temp) to 95C.
Few minutes ago,the coolant temp is around 100C.So I decided to let the car off and
the temp is 110C.



I had been faced kind of this issue 6 months ago.I got the bad viscous coupling.
Today I also test the viscous coupling fan.it's still ok,There's less freewheeling when the temp. is hot.

I had been done for 6 months ago..

Stock 87C T-stat had been drilled out for small 3 holes on its housing by Ex-owner.
T-stat was boiled and working nicely.But I still havn't removed for a test for last night
overheating.

Radiator had been removed the plastic ended tank to see if there's any clogged up
on the core.

Electric fan was working fine.

the head had been off to see any bent on the head.I found nothing.

head gasket was 20,000kms.It's pretty new.

Does I miss anything else?