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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Radiator fans not coming on. replaced thermostat and cooling sensor


Hi Bill, is the engine actually getting hot enough for the fans to come on? if the engine does have overheating problem (but you say the temp gauge reads normal) then i would check the operation of the engine temp switch, there are two, one for the gauge and one for the fans.

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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.
This boiling is usually unnoticed after a short, i.e., local, trip because the cooler coolant already in the recovery tank quenches it. But after some highway driving the influx of more hot overflow heats up all the coolant in the recovery tank to the (unpressurized, i.e., "natural") boiling point.
As the engine cools when shut off, the contracting coolant in the radiator sucks back coolant from the recovery tank. Fluid in the recovery tank should never be below the "full hot" or "full cold" marks, lest air be sucked in.
-- 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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2 blocks is fast to reach boiling.Take the cap off the overflow tank and fill it right to the very top with coolant.Start the car and watch for a steady stream of bubbles.If you see a steady stream you do need a head gasket or have a crack somewhere in a combustion camber.

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Hi,
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2, hot condenser in front of radiator heating air going through cooling system.

A small difference in engine temp can be expected, but if the car is running hot get it sorted out.

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No heat in cab.


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

Take off radiator cap when engine is COLD

Start engine

Let it idle until it's HOT

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

You should now have tons of heat

Providing your water pump is working

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Hi, Sounds like the water pump is not circulating the water, as soon as the engine heats what water is in it, it will boil. Since you are brave enough to open the radiator when it is hot ( Bad Idea ! ) open it when it is cold, start the car and watch to see if the coolant circulates. You may have to wait unit the thermostat opens and if the water pump is bad when the thermostat opens it may spray hot coolant and steam instead of circulating what is in the radiator so don't be in the way. Not the best way to test this but works if you don't have diagnostic tools. Good Luck! By the way, coolant means antifreeze mixture which if it gets too thin lowers the boiling point significantly.

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