Sounds just like a problem I had. It was the thermostat.

John Rodgers
88 GL Driver

John Flaherty wrote:
>
> Subject says it all. Engines running hot (about 3/4 of the gauge) but the
> radiator is cold. I've bled it twice, no help. No evidence of leakage or
> internal head gasket problems. If I run both heaters, I can keep the needle
> centered. Ambient air temp in the 30's. Traffic and speed have no effect, it
> does it in the city and on the highway. I'm thinking thermostat. Would that
> cause these symptoms? Any other ideas out there?
>
> Thanks,
> John Flaherty
> '84 GL Insufficient Funds