I did this once.  It sucks.  You are talking about the little bolt with a 10mm head?
All you can do it drill it out and put a nut on the oposite side.
John.

>>> Wesley Pegden <wes@CS.UCHICAGO.EDU> 11/6/2005 1:57:53 pm >>>
Yes, the advice I didn't heed was the advice I should have...  I just
twisted the head of one of the bolts on the lower thermostat housing.
What can I do about this?  I don't have easy access to lots of fancy
tools.  Is there some reasonable way out of this situation?

Thanks....
Wes

('84 1.9l manual)

TC wrote:

>>AND don't forget to get the back of the van up onto a set of ramps.
>>That will help with coolant loss and with (slightly) better access to the
>>
>>
>area.
>
>
>>A large sheet of cardboard to go under your backside is also a big help
>>- it can keep you out of the coolant puddle! Old carpet is good, too.
>>
>>
>
>and dont forget to soak those seized bolts on the themostat for 5 weeks b4
>you start, then when you do snap them off...:)
>
>
>