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rapid overheating

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jkseries:
Could someone please help me sort this one out. Driving home form work last night (20 min run) all was fine until about 2 mins from home my temperature needle SHOT up.

This has happened before but last time it was low on coolant.

I'm almost certain it was fine last time as I'd checked everything at the end of last week.

So something is wrong.

After topping it up last night I looked for leaks and there don't seem to be any.

I've got no pressure in the expansion bottle which indicates the head is OK so could it be the water pump.What else could it be?

Any advice would be be greatly appreciated.

Thanks

J

crazymac:
If it was low on coolant last time? And you had to top up the coolant this time? Then you are loosing water somewhere!!

Is the viscous unit still working? Get it up to temp then turn the engine off and try to turn the fan, it should be difficult to turn.

You can also check to see if the water pump is working, Take the filler cap off from the top of the radiator and start the engine, as it comes up to temp you should see a visible movement of water in the rad. This will also help to remove any airlock from the last fill up which you may have missed?

jkseries:
Ok thanks.

I thought I did quite a good job of getting rid of air locks but I might have missed something.

On with the spannering

wizard:
What you driving fella

200 Tdi
300Tdi
Td5 or v8

wizard

jkseries:
Sorry it's a 300TDI.

I ran it for a while yesterday and then bled the system and there didn't seem to be excessive air. Not that I could tell with an even so quiet engine running right in front of me.

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