Hi,

I think it is absolutely normal to see 80-90C while in motion (thermostat setting) and 100C when stoped in trafic or when the car is under high load like when driving up a hill in a hot day with the A/C working (aux. fans setting).

My car's thermostat opens at 87C and the aux fans turn on at 100C. I also was worried about that at the beggining because my other car keeps the temperature constant all day, but after replacing almost every component on the cooling system it keeps running like that and never gets overheated. Here we have 30-35C outside temp all year long.

If the temp gets close to 120C, then you have a problem but 100C-105C is normal in this cars. Just keep the coolant in good condition. Flush the system and replace it every 3 years.

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Juan
1995 E320 Sedan
2008 Ford Escape
RC Helicopter