OK i have a 92 ford Taurus it is having a over heating problem i have changed the thermostat twice in two weeks its blowing cold air when i turn the heat on so what do i do????

replace thermostat before you do anything else.. If it is stuck open there will be not heat

unless it is the heater core which you should flush system,,i always boil my new thermostat to make sur it compresses

heater control valve shot

You may need to replace the blend door actuator or its motor.

hi, the problem you are having is down to one of a couple of problems, now as you state the air blows cold then this points towards the thermostat not opening so this then dont pump the coolant round the engine resulting in the top half of the being hot and the bottom half cold so this is why you only get cold air.

so the first thing you should do is get the thermostat changed.

you also need to bare in mind that the problem could be a damaged water pump this does happen from time to time so check for any signs of water leak where the water pump is by the timing belt, if their is no signs of leak then the thermostat is the likely cause.

you also need to think that as the engine has over heated this could have caused the head gasket to fail so this will need looking at to if after changing the thermostat you have the same over heating problem.

so replace the thermostat as this has clearly gone and then when you re-fill the coolant make sure any bleed screws are undone if you have any on your coolant system usually located in one of the top hoses running around the engine, (not all coolant systems have one as many are self bleeding so dont worry if you dont see any bleed screws) now when you start filling the coolant up make sure you only trickle the coolant in to prevent any air lock building up in the system.

if you are unsure what you are doing then please leave this to someone who has some idea of the kind of work involved in this type of repair

Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat

feel the two hoses going into and out of the heater core. they both should be hot. if one is cold the heater core is likely plugged. you can try flushing it out to see if you can restore flow to the heater core. if they are both hot the thermostat may be sticking open tho you should have a limited amount of heat. also confirm that the vents are operating as they should be.

robert

thermostat stuck open change it.

Sounds like a stuck thermostat no heat water not circulating to heater core engine overheats stuck thermostat won't let water circulate through engine

If it does blow air, but only cold air; Check the thermostat, or the blend door actuator (under dash). If it doesn't blow any air at all; Check the heater fuse. If the fuse checks ok; replace the blower motor resistor. Best wishes to you.