Question about 2005 Ford Mustang

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Engine coolant overflowing

My coolant boils over after driving. My guage reads normal, My Fan will not kick on unless I turn on the AC unit. It does not feel as though there is much liquid in the hoses but the overflow is topped off. I replaced the temp sending unit and thermostat. I checked the fuse and relay switches for the fan and they are ok. I turned on the heater and the air is cold and will not warm up. Is it possibly a water pump issue? Tom

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  • ttpickin Sep 04, 2009

    I'm trying to respond to emissionwiz. When I disconnected the temp sensor the fan worked. I assumed that meant the sensor was bad so I replaced it. Thanks Tom

  • ttpickin Sep 04, 2009

    I had disconnected the sensor and the fan worked so I replaced the sensor. I believe there is not any water in the hoses. I opened the radiator drain and there is coolant there but the hoses get hot but do not feel as though there is water in them.

  • yadayada
    yadayada May 11, 2010

    does the fan work if you disconnect the engine coolant sensor?

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By disconnecting the sensor you send the cooling fan into safe which turns it on, this quickly eleminats all the fan parts, if it still overheats check for leaks, really doubt the water pump is the problem, they just seem to last forever on this engine, but you may have a leak, top the cooling system with 60/40 mix of coolant, and the coolant recovery tank and see if the overheating stops, it it does have the system pressure tested for leaks by a shop, cost will be maybe $50, this is a small price to pay to save the engine from the severe damage that overheating causes the newer aluminum heads, a $1000 plus repair job at the least.

Posted on Sep 04, 2009

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The car was overheating i checked all hoses and replaced the thermostat the radiator it still is ovrheating and the water is boiling in the overflow tank


Answer could be a faulty thermostat,or it could be a sign that your head gasket is about to blow ,or last of all your timing could be out of sync.

Answer 2 from Inventus: It means your cooling system is funtioning properly. In a system having a coolant recovery tank, coolant in the radiator is always up to the brim, hot or cold. There is negligible or no air space. When coolant in the radiator expands sufficiently due to warming from the engine, it will squeeze past the pressure cap's bottom seal and flow into the recovery tank. (If no provision for such expansion was present, the expansion would rupture the radiator or your hoses.) Only coolant within the radiator is under pressure, and because of this pressure (together with the elevated boiling point that the "anti-freeze" permits), it normally does not boil. But once past the pressure cap's bottom seal, the overflow is at atmospheric pressure and therefore boils.
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-- BETTER ANSWER ==
Your cooling fans are not turning on. It is not normal for your overflow tank to boil like that. It is true that your radiator is overflowing into the reserve tank, but that means yourr adiaotor is boiling. Check for blown fuses or relays for your cooling fans. IF theya re fine. run your engine for about 15 minutes and drive. When you temp level is at normal operating temp open your hood with the engine runing and see if your fans are on. If they are, then you may have a bad thermostat or a plugged radiator, or a bad water pump. If the fans are not on, get your cooling fan switch replaced if your car has one. Check your temp sending sensor

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You did not BLEED the radiator and it's over heating.

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As it heats up you will notice air bubbles coming out of the radiator filler neck.

Let car run until you don't see any more bubbles

Fill radiator coolant to keep it topped up to the hot mark.

Put radiator cap back on once you hear the fans kick on.

Done

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Providing your water pump is working

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