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SN-95 and New Edge Mustangs
Keep blowing 50 amp fan fuses! HELP PLEASE!
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<blockquote data-quote="ninety5fiveoh" data-source="post: 12167519" data-attributes="member: 37012"><p>SUNDAY UPDATE:</p><p></p><p>OK, so let me outline where I am currently at to see if this helps. I also made a little headway on diagnosis:</p><p></p><p>- I start the car cold, fans are obviously not on.</p><p>- I turn the a/c on MAX (car still cold), and the fan comes on as it should.</p><p>- I shut the a/c off, fan shuts off.</p><p>- With the a/c off, car still cold, I unplug the coolant temp sensor on the intake manifold, fan turns on.</p><p>- I plug the coolant temp sensor back in, fans shut off.</p><p></p><p>ALL IS NORMAL AT THIS POINT.</p><p></p><p>- Wait for car to get to ~188 deg where the tune calls for the low speed fan to come on, which is DOES.</p><p>- Low speed fan runs fine until 194 deg where the tune calls for the high speed fan to come on which is DOES NOT and the fan shuts off completely.</p><p>- At this point I checked the 50 amp fuse in the main engine fuse box and it is NOT blown.</p><p></p><p>LET THE CAR COOL FOR 5 MINUTES.</p><p></p><p>- Fired the car back up at ~188 deg where the low speed fan should come on which it DOES.</p><p>- 30 seconds later when the car gets to 194 deg when high speed is supposed to come on, it does NOT and the fan shuts off completely.</p><p>- At this point, turning on the a/c on max does NOT turn the fan on, nor does unplugging the coolant temp sensor.</p><p></p><p>LS1KILR mentioned the a/c compressor might be going south so I tested that as well with the car COLD.</p><p></p><p>- With the car running, I turned the a/c on max, and unplugged the sensor mounted on the a/c line directly underneath my powerpipe. The compressor kicked off. I plugged the sensor back in and audibly heard the compressor kick back on. </p><p>-With the sensor plugged in, I also jiggled it back and forth, up and down as much as I could to see if there was any sort of continuity issue with that plug which there was NOT.</p><p></p><p>At this point, from my testing, clearly the wiring to the fans is ok because low speed works all the time, and high speed HAS worked for the last 2 weeks, then only worked intermittently over the last 2 days. </p><p>THOUGHTS?! THANKS!!</p></blockquote><p></p>
[QUOTE="ninety5fiveoh, post: 12167519, member: 37012"] SUNDAY UPDATE: OK, so let me outline where I am currently at to see if this helps. I also made a little headway on diagnosis: - I start the car cold, fans are obviously not on. - I turn the a/c on MAX (car still cold), and the fan comes on as it should. - I shut the a/c off, fan shuts off. - With the a/c off, car still cold, I unplug the coolant temp sensor on the intake manifold, fan turns on. - I plug the coolant temp sensor back in, fans shut off. ALL IS NORMAL AT THIS POINT. - Wait for car to get to ~188 deg where the tune calls for the low speed fan to come on, which is DOES. - Low speed fan runs fine until 194 deg where the tune calls for the high speed fan to come on which is DOES NOT and the fan shuts off completely. - At this point I checked the 50 amp fuse in the main engine fuse box and it is NOT blown. LET THE CAR COOL FOR 5 MINUTES. - Fired the car back up at ~188 deg where the low speed fan should come on which it DOES. - 30 seconds later when the car gets to 194 deg when high speed is supposed to come on, it does NOT and the fan shuts off completely. - At this point, turning on the a/c on max does NOT turn the fan on, nor does unplugging the coolant temp sensor. LS1KILR mentioned the a/c compressor might be going south so I tested that as well with the car COLD. - With the car running, I turned the a/c on max, and unplugged the sensor mounted on the a/c line directly underneath my powerpipe. The compressor kicked off. I plugged the sensor back in and audibly heard the compressor kick back on. -With the sensor plugged in, I also jiggled it back and forth, up and down as much as I could to see if there was any sort of continuity issue with that plug which there was NOT. At this point, from my testing, clearly the wiring to the fans is ok because low speed works all the time, and high speed HAS worked for the last 2 weeks, then only worked intermittently over the last 2 days. THOUGHTS?! THANKS!! [/QUOTE]
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Keep blowing 50 amp fan fuses! HELP PLEASE!
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