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300TDI Problems

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D6JAY:


Hi All

Sorry for my 2nd post being a long one, I’m just scratching my head about this problem and not getting anywhere.

I bought my 300tdi around 2 weeks ago to replace my Pajero, travelling back from picking it up it over heated and started chucking water out the expansion bottle, anyway filled it up and travelled the rest of the way home with no problems.  After doing some initial checking I found the rad had seen better days so I bought a new rad and stat fitted them and all seems ok.

Anyway, all seemed fine after the rad change and I travelled 150 miles to Wales on Saturday with no problems and with the temp staying just under half way.
Travelling around 1 mile into the first green lane I suddenly had no hot air from the heaters....temp stayed normal. So stopped, had a look under the bonnet and found water coming out of the header tank, took the cap off and the water was luke warm?!
Topped up and carried on going to a more convenient place to stop.
Still no heat out of heaters and water constantly coming out of the expansion tank but no change in temp on the gauge.
Stopped again, took the rad and stat filling point bolts out, topped up with water through the rad (took quite a bit) then topped up through the stat housing then topped up through the expansion tank so I assume this would have bled the system properly??

Started on my way again and constantly having the same problem!
I did note that the water pipes were very hard while the engine was running, harder than other cars that iv owned?!
Tried the obvious hgf test, expansion cap off and rev the engine and no violent bubbles but as the engine heated up the water level rose until it crept over the top.......but the water in the expansion tank didn’t get warm! 
I have no water in oil and oil in water etc etc.
All day I had no hot air from heaters.
Travelled home and started to get heat from the heaters, checked a couple of times at services and no water coming out of the expansion tank but quite a bit of pressure in the pipes, opened the cap to let the pressure out and no water escaped.
Temp stayed just under the half way mark all the way home.

I thought i would give it a try yesterday, so travelled along the motorway for 5 miles with no probs, went laning for around 5 miles with no probs but then stepped onto the motorway to travel back and over heated straight away.

Any ideas?

Mud-muncher1:
Sounds like airs getting in from somewhere, it could be a pipe thats split and pulling in air or worst case head gasket has gone as i had a similar problem that was on going for 3 months and mine was that the head itself had a hair-line crack in it, but by the sounds of yours, i would say that the gaskets been on the way out and finally give up the ghost,

Hope this helps and you find the problem soon, Jav.

wvanman:
it sounds like air in the cooling system    there is a bleed plug (on the top of the radiator)   with engine running and expasion cap off  unscrew the bleed plug   and let the air come out  (keep an eye on the Bottle level too)   once air out tighten bleed screw, check water collant level      and   jobs a fish !!   hope that helps

bogie:
Your water is presurising,go to an engine reconditioners and ask them to sniff the water!. They insert a special probe which has chemicals in it that changes colour ,green if i remember right,this will indicate exhaust gases in the water. Basically head gone or head gasket.£5 for a shiff. You must have the head presure tested!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

ChrisW70:
Are you losing any water anywhere?
Check the twoflowand return rubber hoses from the back of the block to the bulkhead as these can sometimes pin hole. Is the water pump ok?
Could be an airlock or worst case the head has gone between the water jacket and the exhaust - is there any steam from the exhaust?

There's a bit of a procedure to bleed the cooling system, take the plastic caps out from the top of the rad and the thermostat housing, top up the rad until the there are no bubbles, refit the blanking plug then top up at the thermostat housing until full. Keep an eye on the expansion bottle while topping up at the thermostat housing.
Make sure the heater controls are both set to full heat before topping up.
Run the engine to get up to temp and check in the expansion tank to see if the water is being pumped through.

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