low coolant light - Ford Mustang Forum
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post #1 of 20 (permalink) Old 11-29-2009 Thread Starter
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low coolant light

i have a 2000 mustang gt and about a month ago the low engine coolant/antifreeze light went on..since i didnt have antifreeze i put water thinking it would solve it..it did..then a day later it went on again and i bought coolant and put some in..it lasted about 30 min with the light off and then it would go back on..ive done this like 3 times and each time it will only last about 30 min then go back on..wat can be the problem? should i flush the entire coolant or what can i do or whats wrong?
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post #2 of 20 (permalink) Old 11-29-2009
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Coolant Problem

Does the coolant level keep dropping? Is that why you have to keep adding more coolant?

If so, you have a coolant leek somewhere.

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post #3 of 20 (permalink) Old 11-29-2009
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oh

ya if the level keeps dropping then you have a leak but if you dont notice any coolant on the ground then it sounds like you could have a internal leak and your engine burns it (bad head gasket) do you notice any one the ground after you fill it ??
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post #4 of 20 (permalink) Old 11-29-2009
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I've had a similar problem (99 GT) which was fixed a while back by a heater core bypass. It's been a few years since then. Now i've noticed a coolant smell again and coolant leaking occasionally on my right leg as well as a soaked driver side floorboard. Any ideas what the problem could be?
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post #5 of 20 (permalink) Old 11-29-2009
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ya plus one if u can add collant 3 times u got a leak. first check ur pi intake the thermostat houseing they have been know to crack... thein check ur oil if its milky, thein as said check to c if u leave a pudle but i would keep a close eye on it....
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post #6 of 20 (permalink) Old 11-29-2009
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I have a 2000 GT also, my light came on after the switch failed. My level was full and the light wouldn't clear even after cleaning the float switch, etc. Ford conveniently molded the switch into the coolant tank, so it has to be replaced with the switch.
Unless you want to fork over $100 for the tank/switch, you have 2 choices...

(1) Unplug the connector on the bottom of the tank which will turn the light out

(2) Live with the "battery" light as my wife refered to it as... LOL


EDIT:

I missed the coolant adding part... does your level drop, or are you just adding a little each time?
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post #7 of 20 (permalink) Old 11-29-2009 Thread Starter
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it might be a leak because when i would fill it up again then the light will come back on after 30 min or so and then when i checked it once it was cold it would be missing a little bit..so what can it be a head gasket leak? because i had to replace the intake manifold about 3 months ago due to it cracking and the manifold gasket going bad too so that lead to my coolant leaking all over under the manifold..
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post #8 of 20 (permalink) Old 11-29-2009 Thread Starter
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and no there isnt none on the ground after i fill it
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post #9 of 20 (permalink) Old 11-29-2009
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Quote:
Originally Posted by WillieGT View Post
it might be a leak because when i would fill it up again then the light will come back on after 30 min or so and then when i checked it once it was cold it would be missing a little bit..so what can it be a head gasket leak? because i had to replace the intake manifold about 3 months ago due to it cracking and the manifold gasket going bad too so that lead to my coolant leaking all over under the manifold..
who installed it? might have done a bad job thats my guess maybe gasket didnt line up, or maybe he crushed it and it split did u use a stcok replacement or go aftermarket?
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post #10 of 20 (permalink) Old 11-29-2009 Thread Starter
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it was a dorman pi intake manifold and we bought sum gaskets too..but it was fine after the install tho until like 2 months later
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Do a pressure test on the cooling system. It could be a simple as a bad radiator cap or a failing heater core, radiator, head gasket, hose, etc.
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my light stays on and its always full. but i seen that the float just stays at the bottom in the tank so i figured it was broken

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Quote:
Originally Posted by grn 00 gt View Post
Do a pressure test on the cooling system. It could be a simple as a bad radiator cap or a failing heater core, radiator, head gasket, hose, etc.

Good call, same as I was suggesting, a pressure test will let you know if the system has integrity, and it likely doesn't if you have to add often. Could be a bad hose, clamp, leaking radiator, heater core, termostat housing/crossover, head gasket, intake manifold, or a bad water pump. The pressure test is very useful because you can do it when the car is cold letting you get in close without getting burned and the coolant will actively leak under pressure.

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Quote:
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my light stays on and its always full. but i seen that the float just stays at the bottom in the tank so i figured it was broken
Unplug the wire on the bottom of the surge tank and light goes out!
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i haven't heard ANYTHING good about the dorman intakes. so was the oil milky? it really sounds like a bad head gasket....

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