I like the idea of incorporating old school tec to sideline digitec when it may be suspected to provide a possible solution... Though I might be inclined to wonder if there are other aspects of the digital programming might rely on the inputs from the radiator sensor, if any. Were that a possibility I might think to install whatever other sensor and relay used to operate the fan separately, perhaps going even more old school by installing an override switch, to bring on the fan manually, if the temp sensor might have failed , or go the whole hog and install an illuminated means if indicating when the fan is running..... I do remember somee years back when Spanner Juggler was directly behind me in traffic that his fan seemed to be running constantly in his 90`s (?) model + 8 whereas the fan in my old mid 80`s +8 did not come on though my engine was at normal running temps. We chatted about it, and as best I remember Colin may have suggested that the later engines were lean burn (to cut emissions?) and thus ran at higher temps.
My old Mog took us on a few trips around the Med without ever spitting it`s coolant out, and still seems to manage to avoid being incontinent despite it`s age, though never ever liked the look of that otter switch and its grommet in the bottom of the copper/Brass rad... Hmm..
I crawl along my single track for a few hundred yards before arriving home, and on a hot day, my cooling fan often cuts in just as I reverse into the garage, and continues to run when the ign is switched off until the otter switch senses the drop to the required temp..
