Have changed the thermostat and water pump, car is still overheating. UNLESS i put on the heater and turn it on full ....2001 taurus ses. help!! any advice would be appeciated. was told that it could be a fuse problem, i found the box, but which one should i check?
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Re: overheating/fan not running
If the cooling fans do come on, replace the radiator. It has probably plugged with deposits from coolant that has not been changed every 2 years as recommended. Radiators.com has real good (low) prices and excellent quality all metal radiators--do not get 'plastic tank' unit.
IF the fans are not turning on, it is either the temperature sensor for the cooling fans, the relay, the fuse, or the fan motor-or a loose connection in those circuits.
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Need more info then how much you spent . Is the motor a 4.6 L have you changed the water pump or radiator thermostat? Is the cooling fans kicking in? Do you have heat going in side of car from the heater core ? Is the motor full of water/antifreeze? ....I would start at the water pump by taking the belt off the pulley and spinning it by hand . If it spins freely with a little effort then is should be fine . If it makes noise or just spins freely then replace it . Take heater core hose off and spray water threw it and check to see if it is clogged...if take thermostat out try running water threw the heater core hoses and see if it will circulate out that way . If no glogs are present put hose back on heater core . Fill the motor threw thromstat housing till it is all the way full. Put thermostat back in and fill daditor and over flow tank . Ford 4.6/5.4L seemed to really have to build up pressure before the temp gauge starts working right and to get good flow threw them . So take it for a good drive where you can open it a few times and really let it warm it . Then when you pull in and shut it off you might hear gurggling from the dash that's air getting pushed out of the heater core . Check your fluid level for the next few days and make sure to keep it full till it stops going down . I have had to do this many times on the fords 4.6/5.4L and then every works but genraly these motors don't have over heating problems unless there is a glog , bad water pump, or simply giving a false reading due to air being trapped in the motor
Yes, replace the thermostat. Then you need to 'burp the coolant system'. Your car has all the hallmarks of air in the system, especially a heater that is cold. This is because there is no water in the heater matrix. This is why it overheats. The system must be full and with no air to circulate correctly through the radiator.
Burping involves the following steps.
Remove the lid to the reservoir, remove the radiator cap, fill the radiator to the top, turn heating on full blast, start engine and get to operating temperature, keep topping up. Squeezing the radiator hoses helps. The level will rise and then drop when the thermostat opens. Top up when bubbles stop and the level becomes constant. Put radiator cap on, top up the reservoir and put the cap on that.
i didn't see you last posting about your water pump but theres is a tiny radiator called a heater core. it has the same hot water running through it as your big radiator and engine have.so when you turn your thermostat to hot and kick on the fan the fan blows through the heater core and wallaa you have heat you probably need a thermostat.if you have no heat and it is overheating hear and there that's probably what you need.make sure you see if you filled the radiator up all the way when you changed the water pump.
could be waterpump?
i was going to say rad fan,but if so heater would be hot.
lack of coolant will make heater core to blow cold,if engine heats up with full coolant,usually means poor or no circulation.
run engine with full coolant,at operating temp.with rad cap off and look in rad cap hole and see if there is movement of water inside rad.
[rad fan will not come on if water is not circulating through rad water pump?]
If the water pump is leaking, then you need to replace it, replace the thermostat as well. Make sure you have got all the air out of the cooling system, when you refill the coolant, by undoing the top hose of the radiator till water comes out, likewise with a heater hose, then start and check, when the temperature is right the fans should cut in, keep an eye on the temp guage whilst doing this.
Hope thgis helps
Make sure your fan is working properly. When you turn on the heater you are forcing the fan to cool the radiator. It may not be turning on automatically when it is supposed to. Let us know if this helps..