Water pump sensor

Taiwan Wiggins

Asked by Apr 21, 2016 at 08:39 AM about the 1998 Ford Expedition 4 Dr XLT 4WD SUV

Question type: Maintenance & Repair

I have a 98 expedition and the car lot said I have
two sensors I changed the top sensor but they said
its the one behind I have no heat I changed my
thermostat but when I'm driving the temp gauge
goes to h is that possible

5 Answers


You probably didn't bleed the cooling system when refilling with coolant.

Taiwan Wiggins

How do I bleed the system


Have the radiator cap off, run the engine to operating temp. when it is warming up until the thermostat opens it may push coolant out the top of the radiator, thats normal, just pushing the air out, keep filling until full while running, put the cap back on with the engine running. Check the coolant reservoir the next day after it has all cooled down, make sure it is full to the cold line.

Taiwan Wiggins

Ok so are there two sensors on the water pump


There should be one sensor by the water pump, and the other is in the cylinder head. Did the engine seem to overheat or is that what the gauges said it was doing? A air pocket would make an erratic reading also, but motor would be hot. Should try bleeding out first to see if you need to replace the temperature sending units.

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