Vehicle & Technical > Discovery

Another overheating problem

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gords:
This has only started recently so I don't think it's a problem with the fan!

I set off for Billing (via my brother's) this morning, happily crusing along the M25 at a nice 70MPH. Came to a bit of a hill so I accelerated to compensate. Half way up the (fairly small) hill I noticed the temperature guage nearing the red line :shock:  I backed right off and got to the top/flat - doing a steady 50MPH the temp fell back to normal.

Again, I crept upto 65-70MPH and the temp was fine ... until the next hill :roll:

At my brother's house I checked the coolant level and it was a bit low but not too bad. I topped it up. Off we went to Billing ... and exactly the same thing happened. Obviously, it was a slowish journey to/from Billing.

Before leaving for home, I again checked/topped up the coolant but the overheating happened on the way home :(

There are no obvious signs of coolant loss (no puddles under the car) - so where do I start and/or what signs do I look for?

Anyone want to buy a Discovery...?

John T:
Sorry not an answer, but I'm going to watch this with interest. I had exactly the same problem.
All the way down the M1 to Billing - cruising at 70+ = temp gauge rises to top, but as soon as you drop to 50ish it settles back to the middle. Even sitting in queues it didn't go above normal.

Is it possible it could have been the exceptionally high outdoor temperature?

gords:

--- Quote from: "John T" ---Is it possible it could have been the exceptionally high outdoor temperature?
--- End quote ---

It did it at 7:30am ish this morning - and it was overcast when I left, so I don't think that was it.

It doesn't seem to be specifically the speed, but rather the speed combined with the engine load (70 + flat = OK, 65 + up hill = not OK).

andyhubbard:
I don't know if they are the same but my Rangy has been redlining it and the expansion tank level was fine,i've solved the problem when i undid the nut on the top of the rad and found that the water level was below the top of the fins,i think it was an air lock because you could see the level go down and hear the air come out.Topped up the water level in rad and now no problem.Hope this is of some help-Andy.

burgerman:
we used to run a fleet of peugot diesel vans, and after 3-4 years old as you put on the gas or a up a hill the the temp would rise very quickly, back off or level out the road and fine,  would sit in traffic all day long with no worries at all, at first we took the rads out and washed them out, no bad sludge and seemed to flow ok, the solution was to replace the rads,  we did this to all of the fleet as soon as they were getting warm,   although these were peuguot vans, me mates 300 disco was showing the same symptoms recently, again washed out internally and externally the rad, no difference, replaced the rad, no worries sits same temp all day long, and he doesnt even run a fan unit,

i think what is happening is the veins were furrred up, not completely, but enough to reduce th ecooling, but not enough to stop the complete flow of water through it,    only my experience ,good luck hope it helps

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