1991 Volvo 940

Engine Cooling problem
1991 Volvo 940 4 cyl Four Wheel Drive Automatic 116000 miles

I recently change my radiator and the sensor at the top just keep popping out, sending anti freeze all over the car. This will happen any time the car is idle. The mechanic changed the thermostat and the problem still persist. I need help.
October 14, 2008.

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