Vehicle & Technical > Discovery
Overheating 300tdi
discograham:
I give up. I can't fathom this one out, so I'm desperate for opinions and advice...
Started overheating a few weeks ago, which seemed to be due to water loss due to a split hose. Fixed the hose, still overheating, still loosing water.
Eventually changed the water pump for a new one. The belt tensioner was also siezed, but thats now been freed and oiled and is working fine... ( Frankie boy... that was the cause of the belt problem )...
So now I drive for a couple of miles then she starts to overheat... gets hot, then hotter... but when I go around a roundabout the temp gauge drops immediately back to normal...but only for a few moments, then it creeps up again...and past the red...
Yet the gauge shows it to cool down in a few minutes once the engine is off...
And it's still loosing water somewhere... but I can't see where...
Head gasket blew a couple of months ago, and there are no signs that it's blown again...
Now, I took out the thermostat to see if that was the problem before I changed the water pump... and haven't put it back in yet.. so one of my questions is this... could the increased water flow actually be affecting the cooling process adversly..ie, flowing so fast as to not allow time to cool adequately ? And could this in turn lead to water boiling off rather than leaking away ? God knows I can't fathom it out... any ideas ?
L90OOK:
I'd put money on the head gasket & possibly a new head needed.
cardiff_gareth:
Have you checked the P gasket :?:
TDi90:
what about testing the thermostat in boiling water first. get a thermometer, and put that in the boiling water and make sure it opens at the right temp (i think its about 86 degrees c)
Rob
discograham:
--- Quote from: "TDi90" ---what about testing the thermostat in boiling water first. get a thermometer, and put that in the boiling water and make sure it opens at the right temp (i think its about 86 degrees c)
Rob
--- End quote ---
Cheers Rob.. done that already, have new one ready to go in anyway, but still running without one...
LATEST... just blown a hose... the one coming from the header tank... went with a whoosh two mins after I had parked...temp was fine as well...
looking more like pressure due to head gasket all the time...
" Have you checked the P gasket " P gasket is fine , and I have a spare....
Please don't let it be the head gasket again....... :evil:
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