Question about 1997 Ford Mustang Cobra

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'97 With 5.0 over-heats in stop and go traffic, with a/c running or not.With the heater on or off. Other than that, it runs great. It's a 5 speed. Have replaced the thermostat and flushed the radiator,and checked that the fan does go on when it warms up. What do I check next?

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One of the most missed problems with radiators is that the exterior fins get plugged with dirt if the fins are'nt clean they can't cool! you may have to run a garden hose through the front grille and then from the rear of the radiator. If the problem still persists Pull the radiator and check to see the condition of the fins if thats ok take the radiator to the radiator shop and have it FLOW TESTED it must flow at a specific volume. You can't tell by just running water though it with out the correct equipment.

Posted on Oct 14, 2010

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1-your thermostate is stuck open half way. thermostate is a simple device that made of enlarging metals when heat is applied. it suposed to be in close position to allow engine heat up, when specified temp reached it opens and let it flow and radiator tries to keep coolant cool.when it is broken it stucks or it acts slow or it wont acts at all. in your situation it is stuck open half way. it allows enough water to be heated but flow is limited to heat cabin heater.

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The heater stopped working because there was no coolant in it. Your real question is where is the water going.

Have the cooling system pressure tested to be sure you have no leaks. You said you had the radiator flushed, I suspect some of the tubes are blocked, it should be dissassembled and rodded then cooked out. Not just flushed. You problem is in traffic, low speed. The car starts to over heat, it blows the water out of the overflow, the level is down, the heater stops working, then you are out of water in the engine and overheating.


BTW ground the wire that goes to the warning light sensor and be sure it lights the warning light. If htis is the case the sensor is bad. I assume when you turn the key on but before starting the light does work then, correct? That means the bulb is ok, that does not check the sensor.

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