Just my 2c worth...
Low coolant alarms are great and have saved me a couple of times. Once was a split hose and the other the water pump developed a decent leak.
But they won't alert you to an actual temperature issue.
I've now got Engine Watchdog temperature sensor/alarms in 2 of my vehicles.
Recently a failed thermostat that had only been fitted a few months and would probably have cooked the engine if I hadn't had the alarm fitted.
When the alarm went off I wasn't in a position to pull over straight away and just let it cool down, so I turned the heater and fan on flat out which was enough to keep the temperature stable at around 100deg (head temp not actual coolant) until I could safely stop. Ultimately it got me out of the city and home where I could investigate and fix the issue.
Being stop/start city traffic I doubt I would have noticed the temp gauge climbing until it was too late.
Steve
1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
1988 120 with rust and potential
1999 300tdi 130 single cab - "stock as bro"
2003 D2a Td5 - the boss's daily drive
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