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Q: Coolant temps get really high but cool down really fast

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With normal driving the coolant temps get really high but seem to cool down fast also. Once they cool temps seem to fluctuate a lot between 170 and 210. I have already replaced the coolant and t stat and checked for a blown head gasket.

My car has 93000 miles.
My car has an automatic transmission.

This is may be a failing coolant fan switch. Try checking the coolant fan thermostat switch to be sure I is coming on at the right temperatures. You may also need to have the fan speed checked t be sure it is operating at the proper RPM’s according to engine RPM’s. I would recommend having an expert from YourMechanic come to your home to diagnose this and possibly repair coolant fan switch.

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