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Pontiac1976 · 11-20-2021, 06:55 PM

First have you did this drive before under the same speed as possible, what air temps was it out side this day. It looks like from the temp set the fans turning off a little soon I think it should be 170 or 165, But I would do some checking in the Holley EFI board to see what fan ranges with a 195 regulator thermostat not a high flow bypass type thermostat

11-20-2021, 06:55 PM	#4
Pontiac1976 Registered User Join Date: Oct 2015 Location: Ottawa, Ontario, Canada Posts: 750	Re: Coolant temperature fluctuations First have you did this drive before under the same speed as possible, what air temps was it out side this day. It looks like from the temp set the fans turning off a little soon I think it should be 170 or 165, But I would do some checking in the Holley EFI board to see what fan ranges with a 195 regulator thermostat not a high flow bypass type thermostat __________________ 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bed Was a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change.