Vehicle & Technical > Discovery

Overheating at 70 mph

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spy:
I have had this problem twice on my series 3 (not 70 mph tho :D).  1st time I took the radiator off, flushed it and the rest of the cooling system.  I also found an unbeliveble amount of mud that wasnt visible.  Was fine for ages then started again overheating on the motorway.  2nd time it was the water pump.  

Gotta be one of the two!  Fingers crossed for mud in radiator....

Bill jones:
As most of the others have sugested start with the radiator. I had the same problem with wrotten fins, fitted a new radiator and no more over heating at higher speeds.

ChrisW:
Are you using any water at all?
Whats the back of the front cover look like behind the water pump? Are there any traces of water running out and down?
Didn't your cylinder head go recently? Sounds uncannily similar to my experiences  :evil:

I'm still on the original radiator but you probably need to spend a good couple of hours hosing through the radiator from the engine compartment to the front of the car - you'll be surprised just how much comes out  :wink:

The P gasket on the back of the water pump had gone on mine - water tracks on the block behind the water pump are the tell tale signs, fortunately on a 300 it's a seperate component to the rest of the timing cover so isn't so much of a major job, still a PITA tho  :roll:
If it has gone you need one of the 'uprated' gaskets made of metal.

The above seems to have cured the problem for me for the time being although a new radiator will be on the cards at some point, after 10 years or so they tend to clog up inside and lose a fair bit of their efficiency.

jnoshea:
Thanks for the tips.  I'm not loosing any water from the system and I've never really given the radiator a good hosing from the engine side out, only the other way and the air-con exchanger is in the way then, so I'll start by giving it a good clean.  At a little over 100 quid I'm really hoping I don't need to get a new radiator 'cos I've spent out on the car recently with the turbo, head gasket and clutch  :cry:

simdeb:
Had same prob with my disco , but untill i removed the rad found no vines left in the bottom part that you can not see , fitted new rad and electric fan been loads better since

simon

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