It most likely that your thermostat has failed and is stuck open which isnt letting your coolant get up to a normal operating temperature. I would try replacing it. Your best bet is to go to an auto parts store and buy a repair manual and thermostat and do it yourself. Just be sure to follow the steps closely. You will need to drain and refill the coolant also. Hope this helps!

The blower work i no those model were terrible for blow heater resistor go on the passager side under the dash the blower motor and resistor there most of time the wire that connect to the resistor is all coroded let me no and thanks for using fixya