300tdi coolant problem

Scruffyhippo

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Essex UK

• Oct 17, 2010

• #1

Just had to be towed back as I seemed to loose all the water out the cooling system and didn't seem to hold water there is no sign of any leaks, but have refilled it bled it and even removed the thermoatate in case that is causing the problem, have just tried it and is dumping all the water out of the expansion tank like a waterfall, any ideas?

 

davek0974

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Bishops Stortford, Herts.

• Oct 17, 2010

• #2

Sounds like head gasket failure i'm afraid.

 

robint

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werz te cyder applez do grow zomerzet

• Oct 17, 2010

• #3

would have to agree you should never ever try to run a 300 tdi without a thermostat in as it forces to much water down the ports thus another way of blowing the hg

 

Scruffyhippo

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Essex UK

• Oct 17, 2010

• #4

Thanks DAve why would it throw the water out of the expansion tank? I thought that head gasket problems took water in rather than push it out?

 

Scruffyhippo

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120

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Essex UK

• Oct 17, 2010

• #5

robint said:

would have to agree you should never ever try to run a 300 tdi without a thermostat in as it forces to much water down the ports thus another way of blowing the hg

Click to expand...

Has only been out to test it to make sure it wasnt stuck closed

 

Dids

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Essex UK

• Oct 17, 2010

• #6

Scruffyhippo said:

Thanks DAve why would it throw the water out of the expansion tank? I thought that head gasket problems took water in rather than push it out?

Click to expand...

Gone between the combustion chamber and water jacket, therefore pressurising the cooling system.

 

fanatic

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• Oct 17, 2010

• #7

sounds like head gasket as loosing water,otherwise i would have suggested bypass valve problem

 

davek0974

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• Oct 17, 2010

• #8

Scruffyhippo said:

Thanks DAve why would it throw the water out of the expansion tank? I thought that head gasket problems took water in rather than push it out?

Click to expand...

They will force the water out of the tank because the pressure in the cylinders is massiveiy higher than the cooling system, i think something around 400psi. The direction of the water depends on the failure position, if there is an oilway there too then you can get oil in the water and water in the oil because it will run down into the sump and get mixed in.

If there is oil in the water, it will likely need a cooling system flush or two to shift it when its all fixed and an oil change, it can also affect the rubber hoses.

Dave