Details
3.5L V6 north star (i believe
2000 Oldsmobile Intrigu

When idling / low RPM the car will overheat, when on the highway th
temp seems normal/constant there is a little fluctuation if you slo
down and speed up again.

There was/is a small leak in the head gasket that I put some stop lea
in (stupid move i now know) but after i put that in the over heatin
problem started about an hour later i had the system flushed

The problem still existed and got worse, i replaced the thermostat an
it settled down to what i described in the first paragraph.

The fans run and kick up even higher when a temp around 220,
believe, is reached. The pump seems to be working fine because I ge
plenty of heat in the car. The upper part of the radiator hose i
warm and gets hotter when the engine temp goes up and the lower hos
is cool.

When at lower speeds the only way that it seem to cool is to rev th
engine to about 1800 or 2000 or over then it goes down to a norma
operating temperature

Any idea's or things to look at would be appricate

Thanks