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i have a 98 G.C. 5.9, every now and then the V.I.C. tells me i have a bad coolant sensor. i have changed both coolant level sensor and temp. sensor, does anyone have any ideas?

i have 98 gc 5.9, recently my heat just quit, it has the automatic temp control, digital display reads hi, fan works on all speeds, you can change to defrost, vent , floor. it just blows cold air, any ideals