Ok its not a Ford but its an odd one!

My other half's MGF has had an overheating problem which I posted about on here before but I can't find the old thread... but anyways

So far I have replaced the following:

Thermostat - modified to allow bypass
Radiator
Pressure Cap

and as of today the HG (uprated Land Rover spec)


Guess what!

It still isn't right!!!!!!! Its the same as before

Leave the engine to idle and the engine comes up to temp. Then the temp increase to the point where the radiator fan kicks in. This doesn't cut out and the temp guage keeps rising (along with the level in the header tank).

So its definitely going to over heat if left to its own devices.

The crazy thing is that if you increase the revs to say 1750 (or even 4000! it makes no odds so long as your above idle) the temp guage and level in the header tank drops down to normal... Let it idle and this just repeats!

I'm left with thinking its the water pump even though it looks perfect and feels fine it's the only part I haven't replaced!!!

Alex

 

could be a lazy water pump mate

as you are increasing the revs the water is dlowing faster so the pumps kicked back into action

if it still does it once you have replaced the water pump then could be a crack in the block or head

but then id imagin you get oil/water mix and it would run like shit

 

Does sound like the water pump
the vanes have probably worn down

 

Well it wasn't the water pump!!!



So now I am checking sensors and pipes as that is all thats left - unless I start to suspect the block itself as thats soon to be the only common bit left

 

A work mate owned a tf that overheated with the roof down,could be related?