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Re: how do I stop my 01 explorer from 0ver heating. I...
Since you have done the basics, more information is needed. Under what conditions does it overheat, and how severely? Only when at idle for several minutes? Could be bad fan clutch or missing/damaged fan shroud. Severely overheats so bad you can't drive it at all? Blown head gasket? You can often diagnosis this by running with radiator cap removed and see bubbles in the radiator, or also look for water in oil, or oil in the coolant. Also, check with parts store. I think certain years of these run a reverse direction water pump, and if you get the wrong one they will overheat badly.
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Could be any or all three or a bad cooling fan. I'd start by replacing the thermostat since they are dirt cheap. After replacing the thermostat warm the vehicle up and feel the upper radiator hose if its hot the rhe thermostat opened and the water pump is circulating coolant next check the radiator it should be hot near the upper radiator hose and significantly cooler near the lower with an even heat distribution if any parts of the radiator dont get warm/hot then you radiator is plugged. Also you need to check the operation of the cooling fan with the engine warm turn on your ac that should immediately turn the electric fan on
With a over heating problem the first place you always check is the thermastat.Thermastats ALWAYS go. In fact every two years I change the thermastat wether or not it needs it just to be safe than sorry,I live in a snow belt and nothing worst than having no heat in the winter. Something else you might keep in mind, over heating can do allot of damage most people don't consider, the transmission lines are connected to the radiator which cool the transmission
the first thing I would try is thermostat. They are cheap. When it starts to overheat turn the heater on High. If the temp drops at all then its not the water pump. The heater will not blow hot if water is not circulating.
replace the temperature sending unit. Its right there by the thermostat. You can get this at any auto parts store. just need an open end wrench to change it. they do go bad(found out the hard way several years back). I hope this helps you
these are somethings that maybe causing it to over heat (1) not enough cooling in it.(2) water pump drivebelt (3) Radiator core blocked (4) Bad thermostat (5) fan blades broken or cracked (6)Radiator cap need to be replace (7) Ignition timing incorrect if all fails stop by your local library and get your hands on a Haynes auto repair Manual for your car wish you the best of luck Michigan Man
locate the hose that goes to the top of the radiator that hose leads to the thermostat, remove the hose, at the engine there is a water neck be careful as it is rather old and may have rust and is prone to break, remove the 2 screws that hold it in place, remove the water neck (thermostat housing) and remove the old termostat, scrap the housing and engine block from old gasket and silicone, add silicone to the housing and place thermostat in housing in circular ridge then place the gasket over the thermostat apply more silicon over the gasket and spread evenly, allow the silicone to set for a couple of mins and then put the housing back with the engine then connect the hose back and your all set; remember the thermostat part that goes into the engine should be the part with the spring, hope that helps
Based on your description "hard line from thermastat area has a heat wraparound it goes towards firewall", that would appear to be part of the heater system for the inside of the vehicle and would not affect the overheating of the engine.
Most engine overheating could be caused by:
insufficient coolant in the radiator or reservoir;
defective (stuck) thermostat;
too soft radiator hoses (upper/lower);
water pump, belt, tensioner;
radiator fan motor, clutch (if has got one), relay.
Additionally, in a large number of vehicles, the radiator fan motor would only work theA/C or heater is ON.
Corrective action would require determining which is the culprit, pls try:
remove the thermostat completely out and test drive, see if the overheating comes back, if yes, then it is not the thermostat, if no then the thermostat most likely is stuck closed and would need replacement;
on start from a cold engine, remove the radiator cap and pls check if the water flows when the engine is revved. If yes, water pump is working, if not, water pump is defective;
in a closed loop cooling system such as in your car, there is a possibility that the radiator hoses might have thinned down or gotten softer. This could be checked by revving the engine while looking over the hoses, there should be apparent sagging or reduction in diameter when the engine is revved. If any, then they are too soft and would need replacement;
clogged radiators could be flushed/cleaned by removing the drain plug at the bottom.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
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