Reply With QuoteAll the air has been bled out of the cooling system?Originally Posted by KarwashD2V8
I believe that can give an effect similar to what you had.
Fossicker
Hi All,
It was a beautiful hot spring day here in WA, so the wife and I took the old girl down the beach along with some friends in their D3.
Last time I took the old girl (99 V8 auto) on the beach she heated up a couple of times, enough to force me to stop and let things cool down. Shortly after that trip I flushed the coolant, which I'm sure was the wrong stuff and very weak, changed the thermostat, replacing with another stock item and diagnosed and sorted a couple of leaks. One was the throttle body de-icer and the other was the one of the heater hoses that go through the bulkhead.
With all this done I was looking forward to a trouble free drive down the beach with a spot of lunch and trying out the new awning. Anyway, needless to say the exact same thing happened again, twice! This time instead of loosing coolant, the level in the tank rose until it was coming out the overflow, so I guess that suggests I sorted all the leaks.
On the road and through the bush, the temp gauge never moves from it's normal position. I've read on here. a few people saying that you should be in low range on the beach. After using low range to get me out of my first and only bog of the day, I left it in for a while and tootled along to test this theory. This was the catalyst for my first overheating episode. So we decided this was as good a time for lunch as any, and it had plenty of time to cool down. When we moved on I stuck it back in high range and all appeared to be good until I noticed the manual mode and sport mode lights flashing. I stopped, turned it off and back on again, still flashing! After about 5 km's I was stopping again as it was heating up once more. Good news was that this was only a few hundred meters from the beach exit. Once it had cooled, the lights went off as normal "FEW" and off the beach we went.
So Guys, where do I go from here??
All the air has been bled out of the cooling system?
I believe that can give an effect similar to what you had.
Swaggie
SubscriberIt seems to me you have 2 separate problems.
1 You may have a head gasket leak if you are pressurizing the coolant .
I guess you had the coolant at the correct level ie at the seam in the tank. If so it shouldn't be blowing out the cap, although maybe a new cap will fix it.
2 In hot dry sand it is always worthwhile to use low range and using a manual gear (M button pressed) above the torque converter lockup point as this minimizes heat generation in the Torque converter. The lock up point in my old RRC was 1900 and I believe from posts here it is about 2200 in a Thor. It is easy in a D2 as it will hold any gear selected in low range.
I would be changing the transmission fluid if I were you as it obviously got quite hot.
Regards Philip A
ForumSage
SubscriberMate i would 1.blead the coolant 2. Replace the header tank cap and if that does not fix the problem then 3. Budget for new head gaskets... and to my mind if the coolant level had been constant and at correct level and no waterfall sounds before the sandndriving then it does sound more like gaskets. D2 will not overheat the engine coolant from high range in soft sand but then again i deive a manual so mine just bogs down to a stall if you need low range. The cooling system capacity is very good provided it is working well and head gaskets are not blown. Cheers
Swaggie
SubscriberSorry You had me fooled there as that is usually an auto problem.until I noticed the manual mode and sport mode lights flashing.
Regards Philip A.
Master
Thermo fans can be a problem also. When travelling a a (good) speed, air flow across the radiator is sufficient, too slow not enough air flow ??
Can over heat at highway speeds to as the fan acts like an air dam (turning to slow) blocking air flow.
Fossicker
Thanks for all the replies!
When I overhauled the cooling system the air was bled from the system. The coolant level was bang on at the start of the day and has been consistently since the overhaul. I checked the dip stick and oil filler for milk and their were no signs. I'll get a new expansion bottle cap and see what effect that has. Is there any test that can be performed to check for leaky head gasket?
You could do a compression test.
Any cylinders low then you likely have a gasket gone.
Master
"headcheck" A fluid filled container that sits where radiator cap goes, start and run engine, fluid will change colour in the presence of combustion gas.
Very good and non invasive diagnostic procedure.
You could just look in the header tank when its up to operating temp and see if there is bubbles coming in. After the thermostat opens obviously.
Bubbles will indicate a blown head gasket.
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