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Mark VIII electric fan install. |
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Big Bird 
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Joined: 25-August-2013 Location: New York Status: Offline Points: 4194 |
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 Posted: 25-January-2015 at 9:31AM |
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Dumb question...
Why not use factory relays, and power up with temp sensors that are powered only when the key is on, like the OEM systems?
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"What we do in full frontal view, is more honest than your cleaned-up mind."
Randy 1979 T-Bird 2005 F-150 STX RCSB 4.6, 3.55 LSD How the Heck does a REGULAR CAB SHORTBED weigh over 5200 pounds? |
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72 RS 351
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Joined: 04-September-2014 Location: Knoxville TN Status: Offline Points: 2344 |
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Posted: 25-January-2015 at 10:10AM |
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Factory systems don't use simple relays, and they almost all use OEM controllers that are part of other electronics. Plus the points where they activate is usually not what you want, not adjustable, and requires other components. I would call those better choices than simple relays people use to install fans.
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Don
73 Ranchero "Sport 72 front end", floor shift/console, planning EFI 7000+ rpm 351-4V &4R70W 73 Ranchero GT 351C-4V &4R70W for sale later. 92 Lincoln Mark VII SE GTC, OBDII 347/4R70W |
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aquartlow
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Joined: 19-December-2011 Location: Summerfield, Fl Status: Offline Points: 2209 |
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Posted: 25-January-2015 at 10:32AM |
Good question! Well for my situation I have many reasons. 1) My temp sensors aren't designed as a "trigger" source. 2) I wanted to be able to manually adjust on/off temps(I do realize once the controllers on/off temps are set to my liking I wouldn't do any more adjusting, but the option is still there) and I tried to find 2 different sensors that were 3/8" NPT and had settings that were about 10-15 degrees apart (I.E. larger fan on @ 185 & off @ 175, smaller fan on @ 200 & off @ 190.) 3) I actually do use factory relays, but aftermarket relays with a higher amperage rating is a plus. 4) My ride didn't come with dual electric cooling fans. 5) Most "decently" sized electric cooling fan's circuits are controlled through the PCM or other computer control system, I really don't want anymore wiring/circuit complexity than I already have. 6) Most cooling fan systems/circuits won't handle a Mark VIII fan's amperage needs. Todd
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Big Bird wrote: