Re: Cooling system probs - 90 2.5TD
I had the exact same symptom on a Disco 300TDi, it ended up being a head
gasket failure which was preceded by pressure build up and it blew the water
pump gasket, I would get it checked ASAP.
"Nick Williams" <email@example.com> wrote in message
>I could do with some urgent assistance to diagnose the cooling fault which
> has just developed on my 90 2.5TD, since the 406 is off at the menders
> for a week, so the LR is the only transport I have for the moment and it's
> just let me down.
> The vehicle is on its original engine (156000 miles) with, (so far as I
> tell since I've only had it about a year) no major services or repairs. It
> uses almost no oil, which given what I have heard about this engine at
> milage I find pretty surprising.
> Normally it's used for tootling round the Peak District - rarely more than
> miles from home - but last weekend (New Year's day) I did a run from near
> Buxton down to Ross on Wye and back to collect a dumper. It behaved pretty
> well, but seemed to get quite hot when towing the loaded trailer (upper
> of the white section on the dial - never into the red while the engine was
> running although it would sneak up when the engine was turned off).
> Tonight, I have just set out on a short journey and after about three
> the heater went cold (it's never been very hot, but it actually went from
> warm to cold this time) and the temperature gauge rushed up to the red
> region. I stopped and took a look under the bonnet and while the cooling
> system cap blew steam at me when I (carefully, and with gloves on!)
> it, the fan drive was loose (ie.e the viscous coupling was not hot) and
> engine block was still cold enough to be able to touch with a hand.
> I've let the thing cool for twenty minutes (easily long enough - it's well
> below zero on Tideswell Moor tonight! ) and then driven it home. On the
> home, the needle went up to the red, then came down and then went back up
> My inclination is to think that the thermostat is buggered, and I'll go
> take it off in a minute and see what happens without it, but if anyone can
> confirm this, or give me any other ideas (or, more significantly, tell me
> they think this is a pre-cursor to something more serious, such as water
> failure), I'd be grateful.