Could have air in the system. Remove the top radiator hose at the engine and
using a water hose and a rag as a seal froce water into the system. It
should only take a short time but you should see a large amount of air come
though the radiator.

"David Allen" > wrote in message
...
> I've got a friend down at work whose radiator fluid doesn't get hot
> and the over- heating light goes on. The problem is the radiator fluid
> should get hot after driving it around and they're worried its not
> circulating thru the system. The pump has been replaced and the
> thermastat.
>