Also as a rule of thumb, the IAT (Intake Air Temp), and the ECT (Engine Coolant Temp) sensors are based on the same resistances. So when totally cold (at ambient temp), the 2 sensors should produce pretty close to the same resistances. And the graph on the first link below, shows what the exact warm readings should be.
Here are a couple links that talk about IAT and ECT test values and stuff:

Test values: http://www.fordscorpio.co.uk/Sensors.htm

Go EXACTLY 1/2 way down on this page: http://www.fordscorpio.co.uk/eecv.htm


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