i drive a 1992 saturn sl2 twin cam. it has 106,000 miles, manual
transmission. the oil is changed regularly and all fluids are topped off.
however there is a problem with keeping the engine cool. whenever i idle
for more than 10 minutes, the tempurture gauge almost reaches the red.
also, when driving in anything below 3rd gear, such as in traffic, the
gauge almost hits red. i've been having to shut the car off at red lights
and drive with the heater on full blast to keep the engine cool. any
suggestions on what might be causing this?

thanks
jim