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[vbelen4]

I'm getting overheating problems with my 2.5 V6 omega, maybe you could help me. It only occurs stopped, on movement temp stays around 92 ēC.  Often, when I'm stopped in traffic, engine temp rises till 100 ēC. The three fans are running, but I think at low speed. If I rev up the engine at this moment, the temp drops quickly to 92.
Is there a electrical water pump that could be faulty and revving up the engine helps that way? May be the temp sensor is not ok? Any ideas?

[Abiton]

It sounds like your mechanical water pump isn't achieving enough circulation through the radiator at idle.  This may be due to either a partial blockage somewhere (radiator maybe?) making the pump's job difficult, or a dying pump.    Revving the engine simply improves the mechanical pump's 'oomph'.

I don't think there are any electrical coolant pumps that operate while the engine is running.  :-/

[Andy H]

I don't think there are any electrical coolant pumps that operate while the engine is running.  :-/

The 2.5 has an electric pump on the end of the radiator nearest to the battery. I don't know how much effect it has :-/

[Andy B]

I don't think there are any electrical coolant pumps that operate while the engine is running.  :-/

The 2.5 has an electric pump on the end of the radiator nearest to the battery. I don't know how much effect it has :-/

this to circulate coolant around the block when the engine is hot & has just been stopped ...... it helps prevent hot spots 

[vbelen4]

Thanks for your updates. I replaced water pump and radiator a year ago, that's why I had first discarded those items...
I try to find another reason for this symptons...

[vbelen4]

I'm going to flush radiator, maybe this improve coolant flow...
In addition, when I replace rad thermoswitch this week, only a little amount of coolant (half a glass) was lost through the switch hole, is this normal?