Curious problem with my Disco whilst dragging the caravan last week.
Had done over 100 miles with no problem. Dragging up a slow hill, i got a quick puff of steam when I lifted off at the top of the hill, but as I had just driven through a load of water on the road i thought i had spashed something hot.
about half a mile further on, i notice more steam so pull over. coolant has blown the header tank cap look, and is bubbling out. However, the temperature guage never got above the usual mark.
Wait for it to cool. Top it up and set off. Going up another big hill, and as i lift at the top, pop she goes again!
Again no movement on the guage, just the sudden blow.
Wait for it to cool, top it up. Run for 5 mins at fast idle with the cap off, top it up a couple of times, but no bubbles or anything else. so we setoff for the campsite (only a couple of miles away.
All is fine for the rest of the week, (gentle running, but still a couple of big hills.)
Fine on the way home, but 200 miles of towing uses a coulple of litres of coolant. Running without the van does not seem to use much if any at all.
Any ideas for a cause, or what to check before my next trip out with the van?
cheers,
MW