Sounds like that its has got air still trapped in the system and needs bleeding there should be a bleed point on one of the coolant pipes going to the heater radiator or the highest point in the system
SOURCE: 98 Expedition 4.6L Overheating, Blows Cold Air
Sounds like the fan and temp gauge (located on the intake mainfold is screwing up) , if its head gaskets it would be smoking out the tail pipe. Have you added any antifreeze if so was it once a week if so make sure nothings leaking on the ground if there isn't then its your head gaskets that would be a first for a 4.6 which is a good motor and none I would on ever had bad heads. I would check the water pump fan first with truck off grap fan at 9 and 3 and see if it wobbels forward and backward if so it's the fan. I have come across alot of bad fans. Fan would cost $30 and up. Rate of difficulty 1-10 I give it a 4.
SOURCE: heater blows cold air have replaced the thermostat
sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose
SOURCE: 1995 BMW 525I over heating issue. I repaired head
Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.
SOURCE: 2002 ford taurus heater blows cold air , I
You may need to replace the blend door actuator or its motor.
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