Thread: over heating

You could try a new t/stat and see how that goes but i think you will be prolonging the inevitable .
Pull the injectors and see if there is coolant in the cylinders, if so pull the head off.

A new expansion tank cap is only a few dollars (could get delivered) if you want to try that too. It's simple and easy before you move to head gasket. Otherwise... head gasket.

Originally Posted by Judo

A new expansion tank cap is only a few dollars (could get delivered) if you want to try that too. It's simple and easy before you move to head gasket. Otherwise... head gasket.

So back to over heating issue have let it run for awhile and I heard a hissing noise from expansion tank once turned off so Monday I am off to ritters for a new cap as yes I think it has a slight leak

how old is youre radiator ? if its still the original its surely cactus . i had similar problem had radiator re cored all fine now but dont drive with any overheat problem in a rover engine

Originally Posted by redmond

how old is youre radiator ? if its still the original its surely cactus . i had similar problem had radiator re cored all fine now but dont drive with any overheat problem in a rover engine

Honestly no idea had it out the other day though and externally doesn't look damaged at all no bent fins or anything, thats not to say the inside is completely stuffed though I guess

Have you had a cold pressure test on your cooling system?
Your local mechanic or radiator guy would have the special pump to adapt to your cooling system, or a Land Rover guy might be able to help you out with a pressure check if he has the gear and adaptor, the idea is to get the system up to 15 plus PSI (about 200Kpa) which is its design operation pressure, but with the engine cold. Being cold gives the opportunity to poke about the engine without burning yourself and get your head into those hard to get at spots.
If there is a leak anywhere it will show itself by a pressure drop and also will become evident by coolant leaking that maybe otherwise would be evaporated on the engine or manifold with the engine running.
I have used this method to uncover mystery leaks in other vehicles with complex cooling systems that are not easily investigated with the engine hot and running, your leak may be as simple as a rusted steel section of the coolant system, e.g the steel section that runs behind the inlet manifold.
If the pressure drops and no external leakage is evident then you may safely say you have a cylinder head problem, gasket/crack etc.
Hope this may help find a problem if you have not already had it done. Gaz

Well right now I pretty confident it is the expansion tank cap leaking as have used some rescue tape to seal between tank and cap eliminating any leak and no more overheating even after running for ages.
Buying a new cap in morning

Hope you're right - that would be a cheap fix. One of the downsides of having a pressurized cooling system, I guess.

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