well if don tuned it most likely he lowered the fan temps. but if you want you can wire a switch to ground the relay for the low speed fan. look in your owners manual it will tell you which relay it is, then pin it out to find the switching circuit from the ecm, should be pin 85 or 86 on the relay.
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1999 Z28 T-Top M6 - LS6, Bolt Ons, Suspension, MWC Narrowed 9" - 415rwhp 385rwtq 10.847 @ 125.17
1989 IROC-Z H/T M5
2006 F350 SCSB 4x4 6.0L Diesel - Studs, EGR Delete, Powermax Turbo, Extreme Tuning & Exhaust - 13.23 @ 101
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