So it seems like what VW is saying is that with these engines somewhere around 40☏ (22° C) below the boiling point is a reasonable margin. The recommended coolant (G13), when diluted 50/50 has a boiling point of 228° F (109° C) at atmospheric pressure and 248° F (130° C) at 15 PSIG (roughly 2 bar or twice atmospheric pressure). The actual gauge is controlled by the ECU and is filtered to read 190° F anywhere in that range (to avoid causing concern at the temperature varies in normal operation). Normal operating temperatures for a VW diesels are in the range of 170° F to 210° F with the thermostat set to open around 190° F. However, it would run up and down pretty rapidly. The fan would then kick in, and it would come down to 190 very quickly. The data sheet for the coolant should have a curve for different concentrations and pressures (although 50/50 and 15 PSIG is very standard). Normal Coolant Temperature Range When driving east on interstate 80 today I’m CA with what I consider easy to moderate grades, my coolant temp would constantly run up to 215. Is something like 40C a normal temp to see, or is that in the 'oh sht' warning range I usually target a coolant temp of between 31 and 33C with my fan controls. But assuming a fairly standard coolant, diluted 50/50 with water, and a 15 PSIG cap you're looking at around 265° F or 130° C before things start to boil. 36,650 Thunderdolt said: I'm configuring my alarms to trigger on high coolant temp, but am not sure how high to set that limit. Another factor is that the coolant temp gauge may be pinned at 210, as long as it is within the normal operating range. The actual value will depend on the coolant that you're running, the concentration, and the setting of the pressure cap. The reason I say 210 is about right is the oil temp gauge that has numbers on it runs about 210 when fully warmed up, and the coolant temp can't be any higher than that.
Far enough below the coolant's boiling point that you don't need to worry about what happens when you shut the engine down (and you loose coolant flow, but still have a lot of residual heat).
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