That sounds like my car when i leave the grill blocks on past winter. mine is also a 180 thermostat. The fan comes on at about 210. Normal driving (45-65 MPH) with temps at 80-90F outside, the car with no grill blocks runs about 184. In town that goes up to 195. I might try putting my upper grill bock back on but I think it blocks too much air.
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