A sudden change could also indicate a blown head gasket.  Find a friend or 
garage that has a cooling system pressure tester.
Dick Sanders
n a message dated 5/11/99 5:10:40 AM Pacific Daylight Time, 
Steve_Silverstein(at)bose.com writes:
<< I drive my SV to work everyday and last Thursday I noticed the temperature
 gauge climbing when I came to a stop in traffic.  (well above the 85C).
 Close to the 120C, this is unusual for my Alpine.    I live in MA so the
 weather roughly 50F-60F.
 
 I immediately assumed that my thermostat had stuck.    I turned on the
 heater and popped the hood latch to allow more air flow.  The temperature
 gauge eventually went down after driving for awhile.
 
 I did replace the thermostat and the radiator cap but I am still having this
 temperature climbing in traffic.  The condition of the radiator is good
 (cleaned about 4 years ago and looks great inside).     I did open the
 radiator cap and let the car run until the thermostat opened.  The fluid
 appears to be circulating really well.
 
 1) Is there anything else I should be checking???    >>
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