Question about 2003 Ford Mustang

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My 2003 Ford mustang cobra antifreeze is overflowing from the return resevoir, but the temp. Gauge is not showing the car as overheating.

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When the engine is warmed up is the top radiator hose hot ? Is it hard, a can you squeeze it ?
You may have a leak in the head or gasket.

Posted on Feb 04, 2010

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Posted on Jan 02, 2017

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2003 vw 18.t temp lights goes on but temp gauges read normal


If your coolant overflow is bubbling then regardless of what your gauge says you are having overheating issues. If your coolant is missing with no aparent leaks then you need to check your oil for a milky consistency and apearance which would most likely point to a blown head gasket. This would also explain overheating. Hope this helps

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Pushing anti-freeze out the resevoir. Changed water pump, thermostat. Temp. gauge does not indicate overheating. Fans seem to be working OK.


Try replacing the radiator cap. A weak cap will allow coolant to leave the radiator and go thru the overflow tube to the reservoir.

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I swapped a motor from a 2003 mustang to a 1999 mustang. The temp gauge runs backwards and A/C doesn''t work. How can i fix it?


you have the polarity reversed on thosse two items just swap the 2 wires i bet that will cure the problem.

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I got stuck in a traffic jam last night for about an hour. After that my car began to leak coolant out of the return resevoir from the cap. The temp gauge still reads normal but after driving for a bit...


Check and make sure your top radiator hose is hot when engine is warmed up, is it hard, can you squeeze it ? , we are looking to see if you have a head gasket leak, if so your engine will pump air into the cooling system, and over pressurize it, also check your radiator cap, or replace ot with one that has the same pressure.

Feb 04, 2010 | 2003 Ford Mustang

1 Answer

2003 mustang cobra thermostat


you locate the thermostat ,remove it ,go to autofactors with it in your hand and get a new one,fitting is the reverse of taking it apart ,and dont forget to top up antifreeze with neat antifreeze

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Your radiator is getting clogged up with mud causing the lack of air flow through the radiator. You may want to install a mud deflector in front of your radiator to keep the mud from clogging up the radiator and may be run your antifreeze ratio 40/60 (antifreeze/water) the higher the water content the better the heat transfer, but your have to keep an eye on the level of the coolant level more often. Water will evaporate quicker but too muck antifreeze will have poor heat transfer and 100% antifreeze will gel when heated causing poor circulation causing overheating. Good luck and hope this helps.

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Antifreeze overflow


Heater not working sounds like a blower motor or heating core. Make sure that your antifreeze is green and mix 50/50 with water, now check and sqeeze your hoses running from and to the Radiator and if its VERY hard and has a crunch sound, it's blocked up, use radiator flush and follow directions, If not than look into the Thermostat b/c if it needs repaired than it will stick and let enough fluid into the engine so that it does not overheat yet with the pressure will back up into the resevoir. My new thermostat is a 140 degree and i've never soon my temp meter get to half way after that.

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Heaterblows cool air my temp gauge showing truck is overheating


change the thermostate and gasket after you change it let the truck heat up then cool then refill the radiator again after the thermostate opens do not open the radiaator with the truck hot or the upper hose hard

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