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I have bought a scanguage II and I'm tracking the coolant temps. I drive 60 miles one way to work with 50 miles of it is straight highway. Shortly into the drive the coolant is reading 90F and stay there till I get off the highway. Is this normal?:confused:

Mine climbs to 175 or there about and up to 210F. I block my grill ,which allows the ICE to warm faster. It sounds to me as if you require a new thermostat? You don't have your scan-gauge set on metric by any chance? Hal

90°C is a good temperature.

I was concerned based on reading the "A Hybrid Owner’s winter survival guide" that it states the running for long runs at 90°C was NOT good and I should change the grill blocking. But once the car warms up it stays between 87-90°C with an ambient of 32°F. I don't know how cold it will have to get to get the coolant down to the 70°C range.

It sounds like your car is operating properly. The thermostat is holding the coolant temperature within a narrow range as it should. At 90C (194F) the engine is operating at a efficient level and will keep your heater working well in freezing temperatures.

Remember that the coolant is under pressure and has a boiling point well above 100C (212F). It's always a good idea to keep an eye on the temperature because any number of problems to do with the fan thermostat, pressure cap, coolant level, etc. could cause an unsafe rise in temperature.

Cheers,

Roger

It sounds like your car is operating properly. The thermostat is holding the coolant temperature within a narrow range as it should. At 90C (194F) the engine is operating at a efficient level and will keep your heater working well in freezing temperatures.

Remember that the coolant is under pressure and has a boiling point well above 100C (212F). It's always a good idea to keep an eye on the temperature because any number of problems to do with the fan thermostat, pressure cap, coolant level, etc. could cause an unsafe rise in temperature.

Cheers,

Roger
Thanks Dream'R