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Sometimes the heater core get stopped up, especially if someone used stop leak in the cooling system. If the heater core stops up then you wont hardly get any heat. There are possibility's to like if the air doors and actuators under the dash, or the heater controls themselves act up. I would pull the two heater core hoses off under the hood and see if water will flow through the heater core. A water hose is good to use for this. If it is stopped up you wont get much flow. If being stopped up turns up to be your problem, then the heater core will have to be replaced to make the heater work like it should.
LOOK FOR BLOWN WINDOW CIRCUIT BREAKER.YOU HAVE A SHORT IN WINDOW SWITCH OR BAD WINDOW ELECTRIC MOTOR.YOUR HEAT PROBLEM IS A STOPPED UP HEATER CORES.THE STOP LEAK STOP ITS HEAT.THE STOP LEAK HAS STOPPED OR PLUGGED YOUR HEATER CORE SO COOLANT CANT PASS THROUGH IT.YOU GOING HAVE TO FIX RADIATOR LEAK AND REPLACE HEATER CORE TO GET HEAT AGAIN.
what stopped? the air doesnt blow,if thats the case then replace the blowermotor resistor, its located on heater box on passengerside next to blower motor.hope this helps, let me know if this was the problem.
Question not solution. Help same problem. Heater control panel goes blank and heater and air nothing works. They have had it at shop for 3 days and no answer. Help please.
make sure the vehicle isn't over heating. if not the heater core may be stopped up. can check hoses going into and out of heater core. make sure both are hot. if inlet is hot, and outlet is hose is cold, the heater core is stopped
the heater stops working then as you are driving the heater might start working. it comes on when it wants to it was working all summer it seems to stop working in the winter.when it strts getting cold outside that is when it starts acting up.
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