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SN95 Cobras
Anyone with a 94-95 Cobra done the high-speed fan mod?
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<blockquote data-quote="SNAKEYE" data-source="post: 14031314" data-attributes="member: 22534"><p>I tried that fan mod with a manually operated switch under the dash near the steering column for ease of access, and with a thermoswitch strapped to the coolant crossover tube. Both worked just fine.</p><p></p><p>After much experimentation and testing I settled on still another way: installing a second ECT sensor "in parallel", both electrically and thermally, by wiring an identical-to-stock ECT in parallel with the stock ECT, and via a tee connector screwed into the crossover tube with the two ECT sensors immersed in the coolant via the tee connector. The key to this setup is that the two ECTs in parallel present exactly half the electrical resistance to the fan control circuitry so the fan-on and fan off temperatures drop about 20-degrees F. </p><p>Again this is on my '97 Cobra. Just how it might work on a '94-'95 I don't know, but the theory of operation is similar. If the '94-95 uses only one ECT sensor for both the fan AND the temperature gauge I don't know how the gauge will react.</p><p>I have a couple of how-to-do-it and how-it-operates write-ups that I can e-mail to interested parties. Just drop me a PM with your e-mail address in the message and I'll </p><p>e-mail my write-ups for your perusal. The additional Ford ECT sensor, the tee connector, and a Ford electrical connector for the ECT sensor cost me about $62 some 10 years ago.</p><p></p><p>I also experimented with paralleling a fixed-value resistor with the ECT. It worked just fine except I wanted a different range of temperature operation. If you're not to fussy with the temperature range a pack of (5) resistors [you need only one for the resistor mod]only costs about $2 at Radio Shack and can be wired into the car in about 10 minutes with no plumbing work. As a for instance, an 8K-ohm resistor drops the fan-0n temperature to 205-degrees (16 less than stock) F and the fan-off temperature to 179-degrees (22 less than stock) F. I have a graph of various resistor paralleling mods that demonstrate the fan-on/fan-off temperature ranges that I can e-mail also.</p></blockquote><p></p>
[QUOTE="SNAKEYE, post: 14031314, member: 22534"] I tried that fan mod with a manually operated switch under the dash near the steering column for ease of access, and with a thermoswitch strapped to the coolant crossover tube. Both worked just fine. After much experimentation and testing I settled on still another way: installing a second ECT sensor "in parallel", both electrically and thermally, by wiring an identical-to-stock ECT in parallel with the stock ECT, and via a tee connector screwed into the crossover tube with the two ECT sensors immersed in the coolant via the tee connector. The key to this setup is that the two ECTs in parallel present exactly half the electrical resistance to the fan control circuitry so the fan-on and fan off temperatures drop about 20-degrees F. Again this is on my '97 Cobra. Just how it might work on a '94-'95 I don't know, but the theory of operation is similar. If the '94-95 uses only one ECT sensor for both the fan AND the temperature gauge I don't know how the gauge will react. I have a couple of how-to-do-it and how-it-operates write-ups that I can e-mail to interested parties. Just drop me a PM with your e-mail address in the message and I'll e-mail my write-ups for your perusal. The additional Ford ECT sensor, the tee connector, and a Ford electrical connector for the ECT sensor cost me about $62 some 10 years ago. I also experimented with paralleling a fixed-value resistor with the ECT. It worked just fine except I wanted a different range of temperature operation. If you're not to fussy with the temperature range a pack of (5) resistors [you need only one for the resistor mod]only costs about $2 at Radio Shack and can be wired into the car in about 10 minutes with no plumbing work. As a for instance, an 8K-ohm resistor drops the fan-0n temperature to 205-degrees (16 less than stock) F and the fan-off temperature to 179-degrees (22 less than stock) F. I have a graph of various resistor paralleling mods that demonstrate the fan-on/fan-off temperature ranges that I can e-mail also. [/QUOTE]
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Anyone with a 94-95 Cobra done the high-speed fan mod?
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