Probably a bit paranoid about the coolant expansion tank levels, like most of us who have had their fair share of BHG`s. I haven’t found any information relating to what should be the normal increase in level after an average journey, (if there is such a thing). So lets say the thermostat, water pump, radiator, rad cap, fan etc are all working correctly, what would you expect the level to be increased by from a cold start up to the end of 40 mile trip. This obviously depends on county, climate, altitude and driving conditions. In theory water expands with temperature the nearer the boiling point the larger the increase in volume. Can anyone give me some increase in levels on their Supra?
Expansion Tank Levels
- Thread starter Bill UK
- Start date
warm readings dont mean anything, you gotta look at it at cold and same ambient temp, and it should always be the same level at that point
^ This.
However to answer your question I typically see a rise of an inch or so on the hottest summer days when I bother to check, which is usually just after engine shutdown. The cold level changes much less and is always within a 1/4 inch of the line I added. That level is, of course, totally related to ambient temperature and assumes zero leakage.
However to answer your question I typically see a rise of an inch or so on the hottest summer days when I bother to check, which is usually just after engine shutdown. The cold level changes much less and is always within a 1/4 inch of the line I added. That level is, of course, totally related to ambient temperature and assumes zero leakage.