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Is the upper radiator hose hard when squeezed when the engine is cold ( overnight sit or several hours of sitting ) with the issue of the pressurization of the cooling system?
Have you replaced anything to try and resolve this issue here at all?
Let me know, thanks, Pete.
It almost sounds like air is trapped in the cooling system. This will create unwanted pressure which will cause the issue your seeing with the pressure under the cap as well as can force an air bubble around the coolant level sensor intermittently setting off the low coolant warning. This won't cause an overheat as there is enough coolant in it to allow the engine to cool properly.
I would have the system bled of air ( usually the best way is with a coolant vacuum machine by a shop or dealer) and it would also be a good idea to have the thermostat replaced as it can stick in some cases causing pressure issues as well.
But this does sound like air trapped in the system needing purged/bled out.
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As long as it is not overheating at all then it is o.k. to drive it but if it starts to overheat then you want this looked into and repaired.
Usually, I have taken the cap off slowly when cold and ran the engine with it off revving it up and down at a standstill to help purge the air and top off the coolant as needed. It will make a mess but this usually works.
Your welcome Andy
It will be messy and may get on wiring or hot exhaust so I always recommend a shop to do it with a vacuum fill to prevent this mess.I have done it before carefully and rinsed off any coolant that spills and made sure no wiring connections got any water in them.