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Land Rover Repair/Coolant system


QUESTION: Good day Mr.robison I hope this finds you well. I have a 2000 land rover discovery 2. The other day I left the coolant cap off of the reservoir. It started running hot so I pulled over to let the truck cool down. As I was leaving I noticed a large coolant spot on the ground, truck starting running hot again. The coolant cap was off for about a day. I refilled, and put the cap on tight. Is it possible that I have introduced air into the system, and need to bleed it? Have i damaged the thermostat? Your thoughts would be most welcomed. Thank you.


ANSWER: It sounds like you have an overheating problem.  Opening the cap won't introduce air into the system but boiling over might.  However, the truck would not have boiled over in the first place without some other problem.  Look on the Robison Service blog and on my website for more extensive articles on Land Rover V8 overheating.  

As these truck get older, more and more of the overheating issues stem from internal engine failures

---------- FOLLOW-UP ----------

QUESTION: Thanks for your reply Mr. Robinson.
I have one more question. Occasionally I should say very infrequently i would be out driving, and out of nowhere my vehicle would go from normal to hot. I would pull over at a gas station, check under the hood, no apparent leaks, no steam, no apparent reason. I would start the vehicle up, it's now back to normal, and would stay that way for months, reoccur, same scenario, same results. 2 years ago I had a lot of work done by a very reputable rover mechanic, I was having the air bags replaced, I also had him look into the hose leading to the thermostat, it had a history of sliding up off of the thermostat. He replaced the clamps, the truck ran well for about 23 months until now. I always try to find the simplest solution first. Should the first thing I should look at is a failing thermostat? Thank you for your time and advice. By the way I did look up your website and blog.


I am afraid your story sounds like an internal failure in the engine.  I had referred you to my several articles on that and I think a small but growing crack in the block is the root of your trouble, given that you've tried all the common external remedies

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John Elder Robison


I own J E Robison Service in Springfield, MA. We are Bosch Car Service for Land Rover, BMW, Mercedes, and other European lines. I can answer most questions about Land Rover service or repair. I'm known as a car enthusiast, machine aficianado, photographer, writer, and speaker. I've been around Land Rovers and British cars most of my life. Visit me at my car business, or my author website, Check out my autism and writing blog at or my photos on John Elder Robison


I have been a Land Rover service manager since Land Rover returned to North America in 1987. My company is a four-star Bosch Car Service facility, known nationwide for Land Rover service, overhaul, customization, and restoration. In addition to Land Rover our company services BMW, Jaguar, Mercedes-Benz, Rolls_Royce, and Bentley motorcars. We have factory-plus-level service capability for all makes. Visit my company online at > service > land rover Also visit my blog at


In the Land Rover world, my writing can be found in various print magazines and online at robisonservice.blogspot,com. In the wider publishing world, my work is published by 20 publishers in over 50 countries. Mt books Look Me in the Eye, Be Different and Raising Cubby have made US and international bestseller lists.

I am ASE certified, Bosch Trained, and trained by Omnitec/T4 and Autologic on their Land Rover test systems.

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