m40 engine overheating

[jamiedo]

So... I checked the rad - no sign of blockage. Changed the thermostat, started as normal - bleeding air with engine running etc.

The rad and bottom hose are now getting hot. But... as the temp guage started to go just over the middle (12 o clock) I bled the air again, and it was nothing but steam... Is this just something that happens when the engine reaches a certain pressure, or is this a problem?

From the sound of it the water pump bearing is making some crunchy noises, so I'll be changing that in the next few weeks - could this lead to the problem?

[DaveVoorhis]

as the temp guage started to go just over the middle (12 o clock) I bled the air again, and it was nothing but steam... Is this just something that happens when the engine reaches a certain pressure, or is this a problem?

From the sound of it the water pump bearing is making some crunchy noises, so I'll be changing that in the next few weeks - could this lead to the problem?

Steam after properly bleeding the system is not normal. Steam after improperly bleeding the system is common. Crunchy noises from the water pump are bad. Fix now or suffer soon.

[Ross]

It's not circulating. Water pump time now, or head gasket time later.