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At the moment it is the radiator cap which controls the pressure, it releases when the pressure gets high, caused by the expanding fluid, and allows the fluid to go in to the expansion reservoir.
If you replace the expansion reservoir with a pressurised expansion bottle, will you then have two pressure release values, one on top of the radiator and one on the expansion bottle? Or do you remove the one on the radiator?
If the pressure release on the new expansion bottle is set to high for the Jimny you might then get something else fail in the coolant system by going over pressure.
You might also have a mounting problem, the radiator cap in my Jimny is just below the bonnet and I understand that the expansion tank in a pressurised system is to be at the top?
2020 blue SZ5 (one of the last to be registered in the UK)
Ex 2011 Blue Jimny SZ4
Northumberland Jimny Blog
What do you mean by the system "holds pressure overnight"?
The only pressure in the cooling system should come from the expansion of the coolant as it warms, so once the engine cools, the coolant should contract and there should be no pressure.
If you have pressure in the cooling system with the engine cold that would suggest a leaking head gasket or similar.
Agreed, holding pressure over a prolonged period is a symptom in and of itself. Is this pressure something you are applying to the engine for testing purposes or is it something it's doing itself?
Temeraire (2018 quasar grey automatic)
One of the last 200ish of the gen3s, probably.
Bellerophon (2024 grello van daily
ADOS Attention Deficit Ooooh Shiny!
Thanks all. The Ignis now has done the same again but I hadn't realised I needed to empty the tank back and it got a bit hot driving back from Cardiff through the the mid-Wales mountains. I've noticed that once they lose water, the gauge can still read OK so I guess the sender is fairly high in the system. Anyway, I limped it home and will try another cap and check the expansion pipe is clear of the bottom.
Interesting about the overnight pressure. I had the head-gasket done on this car last year including a head-skim. For only the second time ever, I paid a garage to do it and it cost more than the car is worth, by quite a margin. It's the fact that the Jimny does it as well and so have my other ones. Weird! I'll have it pressure tested by the garage that fixed it and see what's what.
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