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| manual fan control switch | |
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| Tweet Topic Started: Jun 3 2014, 09:50 PM (573 Views) | |
| Cyborg | Jun 3 2014, 09:50 PM Post #1 |
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McDumbass
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Anyone ever installed a manual fan switch? I put one in my camaro but it simply plugged in. Was thinking of wiring a 3 position switch, low-off-high with led indicators to control the radiator fan? It would simply wire in to the existing fan wiring harness to maintain stock control but I could manually bypass and turn it on. Any thoughts?? Anyone done it in a metro?? |
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| Mrbreeze | Jun 4 2014, 06:51 AM Post #2 |
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I did it to my brat, Subaru, why would you want to put a off, low, high type switch, why not a rocker type that Is just off or on.. |
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| 490k | Jun 4 2014, 10:30 AM Post #3 |
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Why would you want to have to monitor the cooling system? |
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| doviatt | Jun 4 2014, 11:30 AM Post #4 |
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I can understand monitoring this system but not controlling it. I put a lamp on my fan to see when it turns on. I can change my driving habits to effect the length of time the fan is on but I would never override the system. Edited by doviatt, Jun 4 2014, 02:11 PM.
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| Paulson | Jun 4 2014, 01:02 PM Post #5 |
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Member
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If you were to do this, I would not wire into the existing harness as if you close the switch with the ECM transistor off you may reverse the voltage into across the ECM pinout and damage part of the ECM. I would put your switch across the relay so to let your or the ECM operate at any time without any harm. I did this to my trailblazer A/C clutch as the ECM kicks off the A/C under hard acceleration but for some reason ECM didn't like to turn it back on till after a restart... |
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| myredvert | Jun 4 2014, 01:11 PM Post #6 |
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myredvert
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Why? Something else not working correctly? |
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| snowfish | Jun 4 2014, 01:34 PM Post #7 |
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Basic GearHead
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I removed the mechanical fan from my 96 Grand Cherokee. Gained 2-3mpg. I installed the A/C fan from my Wife's past Metro. Hardwired, and fused at the battery, to a dash rocker switch. A relay would have been the most correct answer. Works great. One doesn't need a fan if you're rolling 10-15+mph. I turn the fan on when stuck in traffic, or at the boat ramp, when the temperature gauge starts to rise. No need for an indicator light. On is on and off is off. If I turn the engine off, I can hear the fan running. Either leave it on, to cool things down better, or turn it off and go fishing.
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| 490k | Jun 4 2014, 01:45 PM Post #8 |
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Still don't see any benefit to this. Just let the thermostat and fan switch do what they were intended to do. |
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| Cyborg | Jun 4 2014, 03:34 PM Post #9 |
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McDumbass
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i am located near the beach, 90% of my travel time is traffic. In one of my old vehicles the thermostat managed to fail and the fan never kicked on, and i had major issues. I love doing electrical work and designing/programming things and I just thought it would be a neat little project that would kill 2 birds with 1 stone.... i get to do something I enjoy as well as be able to manually control the fan IF the thermostat fails or i feel its getting to hot. Im not really doing this because I want to always control it manually all the time, its more of a fail safe type thing. the led indicators would just be to remind me i have it on.
Edited by Cyborg, Jun 4 2014, 03:35 PM.
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| myredvert | Jun 4 2014, 04:37 PM Post #10 |
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myredvert
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First, I am respectfully skeptical of your systems failure analysis that has led you to this point, believing you had two simultaneous unrelated failures (t-stat failure and coolant fan temp switch or the fan itself) in a system that you apparently believed was operating normally right up to that point. After 30 years of studying and being directly involved in human factors and safety research, accident analysis, training evaluating and certifying professional pilots, training instructors and evaluators, teaching workload management, evaluating, testing, and assisting in the design of both certified and experimental aircraft systems, normal and emergency procedures design testing and certification (to include a major airline or two), systems failure mode analysis from an operational design perspective, and probably a few more operational and safety related areas of expertise that will come to mind right after I press "post," and I must respectfully say your ideas from a safety and a systems operations and reliability standpoint have a little known technical term to describe them. Poop. You will decrease safety due to increased workload and distraction, and you will fail to operate the system as accurately and reliably as the system as designed. And all of this is probably for a problem you didn't really understand or possibly helped create in the first place by driving vehicle with at least one latent failure when a second failure happened, IF it happened that way. That's just my professional evaluation. I won't bore anyone with a list of the latent failures and likely potential outcomes you are creating by ignoring an automatic system with redundant backup designed in. |
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| Woodie | Jun 5 2014, 05:42 AM Post #11 |
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If your thermostat fails closed, you're F-ed, fan or not. |
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