![]() That said, perhaps it’s worth noting that Jaguar did away with this push-in scheme for the fan control switch and went to a threaded fan control switch. I would hate to have been the engineer proposing the idea in the first place, but once established it was simply a matter of “how it’s always been done.” It was an established method of installing sensors and the like for many years. My experience has been they work just fine for many years. Not so for the rubber stoppers now in use. If you start to cork a bottle of wine, squeezing the cork, the part of the cork not yet inserted does not expand or lengthen. Interestingly, cork, unlike rubber, is one of few materials with zero Poisson effect. Seems like there’s not much force involved though, since the area is so small. But the drag on the inside of the grommet would cause, via the Poisson effect, an axial deformation that leads to a tightening of the grommet on the probe–like trying to pull a hose off a tube instead of pushing on its end, or Chinese handcuffs. Not to bore, but a third possibility is that axial force on the end of the probe itself would tend to push it outward. The Poisson effect from the external radial pressure would lengthen the bushing though, just like internal pressure in a pipe shortens the pipe. But perhaps the same pressure could make its way between the probe and the grommet, partially negating the effect? Regardless, that phenomenon doesn’t depend on the Poisson effect. OTOH, radial pressure applied to the outer cylindrical surface of the bushing (whose area is much larger than the area at the end available for axial force) would indeed squeeze the grommet onto the probe. With respect to the OP’s problem (ejection of the probe, not the bushing) it would seem that axial force from pressure would tend to expand the bushing radially (as Ed says), but that would make the hole bigger (as when expanding a nut by heating it). Yes, probably right, but I still can’t figure out exactly how. This is what holds the bushing in place when the coolant level probe is inserted into it. If your coolant level runs low to the point that there is insufficient coolant to properly cool the engine and maintain the optimum temperature, your Jaguar will overheat, with expensive and sometimes catastrophic consequences.Ed Sowell already mentioned Poisson’s Effect in an earlier post in this thread. If this warning continues to happen, then your Jaguar must have a leak of some kind, and you must have your Jaguar inspected at the earliest opportunity to investigate the issue. If this warning illuminates you must stop your Jaguar as soon as it is safe to do so to check the level, and top-up if necessary. ![]() ![]() The Coolant Expansion Tank in your Jaguar is fitted with an electrical sensor that relays information to the dashboard to alert the driver if the Coolant level has dropped below the recommended level. X761- F-Pace, all models - All Years (2016-)Įquivalent to Jaguar part number (s): C2Z6566 X590- I-Pace, all models - All Years (2018-) Coolant Expansion Tank Level Sensor Jaguar XF XFR (2016-) - C2Z6566
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