110 C is 230 F I think. Toyota doesn't use the heat soak on any of their 2ZZ cars. It's peculiar to Lotus. But I guess some Elise get driven harder than Toyotas.pete k said:Thanks Bruce, that explains a lot. First, I have never heard it come on, and probably won't. 110 C is the same as 220 F, which is probably possible to reach after turning off a hot engine
But I have another question about the Lotus Heat Soak procedure. Why do the fans come on at 115 C? That's not the circuit the water is flowing through. I definitely know my fans have never come on after the car has been off. An interesting experiment would be to bypass the heater core up front by just switching the hoses and see if the cooling fans ever come on. That would indicate that enough cooling isn't getting done just flowing through the pipes and hoses.