OVERHEATS on 1995 Mercury Mystique

95 MERC OVERHEATS REPLACE THERM,REALYSWITCH,FLUSHE RAD REPLACE FUSES IN BLACK BOX NOW FANS WORK GAGE WORKS COLD AIR OUT OF HEATER AND STILL OVERHEATS GAGE GOES TO RED

by in Rochester, WA on September 25, 2010
4 answers
ANSWER by on September 25, 2010
did you burp the system? you might have an air pocket. (the air pocke is what the temp sensor is reading or theres so much air that its not pressurizing)
ANSWER by on September 25, 2010
it might be your temperature control switch
ANSWER by on January 25, 2011
Are you sure you didn't install the thermostat upside down?
ANSWER by on April 22, 2011
I had same problem Merc made a water pump with a graphite impeller in the water pump. This impeller, with age and heat, will break apart. it will not be noticed from outside because the belt is okay and still turning the pulley. Meanwhile-inside the pump, there is nothing turning the pump. Without circulation your car just overheats, but nothing is putting low through the heater core inside the car. I thought it might be a plugged heater core, but found the water pump problem. Aluminum impellers available but extremely expensive.
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