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SN95 Cobras
97 Cobra overheating!
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<blockquote data-quote="SNAKEYE" data-source="post: 14043803" data-attributes="member: 22534"><p>First things first: do you feel that you have successfully burped the cooling system? <u>If there is no coolant in the crossover tube the ECT sensor in the crossover tube will not get up to proper temperature which will keep the fan from coming on.</u></p><p></p><p>Now then, the ECT sensor on the left front of the engine just operates the temperature gauge, so it is not in question.</p><p></p><p>Then, if jumpering the connector to the ECT sensor located on the crossover tube turned the fan on (which you say it did), the fan motor is okay (obviously) as well as the associated electrical connections, the CCRM, and the PCM.</p><p></p><p>Which brings us to the ECT sensor on the crossover tube itself. Here is how the ECT sensor works. If you look at the curve and temperature chart I posted earlier above you will see that the resistance of the ECT sensor varies inversely as to the temperature. That is to say that the lower the temperature (say 50*F) the higher the resistance (58,750 ohms) versus the higher the temperature (say 212*F) the lower the resistance (2,070 ohms). The electronics of the PCM understands these variations and tells the CCRM to turn the fan off or on as required. </p><p></p><p>As for the "weird thing" of the fan turning on when the ECT sensor is simply unplugged, this is a fail-safe feature that, should the sensor or wiring fail completely, the fan will turn on to prevent overheating.</p><p></p><p>I suggest that you revisit testing the resistance of the ECT sensor on the crossover tube. I know that they are hard to test because of the size and shape of the socket into which the wire connector plugs. </p><p></p><p>I suspect this ECT sensor is the problem.</p></blockquote><p></p>
[QUOTE="SNAKEYE, post: 14043803, member: 22534"] First things first: do you feel that you have successfully burped the cooling system? [U]If there is no coolant in the crossover tube the ECT sensor in the crossover tube will not get up to proper temperature which will keep the fan from coming on.[/U] Now then, the ECT sensor on the left front of the engine just operates the temperature gauge, so it is not in question. Then, if jumpering the connector to the ECT sensor located on the crossover tube turned the fan on (which you say it did), the fan motor is okay (obviously) as well as the associated electrical connections, the CCRM, and the PCM. Which brings us to the ECT sensor on the crossover tube itself. Here is how the ECT sensor works. If you look at the curve and temperature chart I posted earlier above you will see that the resistance of the ECT sensor varies inversely as to the temperature. That is to say that the lower the temperature (say 50*F) the higher the resistance (58,750 ohms) versus the higher the temperature (say 212*F) the lower the resistance (2,070 ohms). The electronics of the PCM understands these variations and tells the CCRM to turn the fan off or on as required. As for the "weird thing" of the fan turning on when the ECT sensor is simply unplugged, this is a fail-safe feature that, should the sensor or wiring fail completely, the fan will turn on to prevent overheating. I suggest that you revisit testing the resistance of the ECT sensor on the crossover tube. I know that they are hard to test because of the size and shape of the socket into which the wire connector plugs. I suspect this ECT sensor is the problem. [/QUOTE]
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