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#1
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Recommended on and off temperatures for electric fans
I have decided to go the dual electric fan route to help with running the A/C. My big concern is when to have the fans turn off and on. I have the Holley Sniper so I can program any combination I want to control the fans. One thing the Sniper has the ability to do is turn on fan #1 anytime the A/C compressor is on. I have a Mildon high flow 180 degree thermostat and the car normally runs 180 degrees, maybe a little more on a hot day, when I am driving at higher speeds. It was recommended on the Holley Sniper forum that with a 180 degree thermostat to have fan #1 come on at 185 and off at 180 and fan #2 on at 190 and off at 185. Then another recommended fan #1 on at 190 and off at 185 and fan #2 on at 195 and off at 190, these seem a little high. A guy that installs the Snipers on Pontiacs for a living recommended fan #1 on at 170 off at 160 and fan #2 on at 185 and off at 175. With this one fan #1 would be on while driving down the highway without the A/C even being on.
So I am wondering what the Pontiac guys have found to work with their cars and what you would recommend? Thanks, Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#2
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Doesn't that Sniper EFI Need like 160 degrees before it start learning ? Also keep an eye on that high flow thermostat. Had bad luck with those sticking. I would try keeping temp around 180.
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#3
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Quote:
Thanks for the information, Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#4
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I also have a 180 high flow thermostat: https://www.summitracing.com/parts/emp-301
My dual fans are set as: Low fan: on@190 off@185 High fan: on@195 off@187
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1969 Pontiac Firebird |
#5
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Quote:
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#6
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I'm usually at about 190 which I like for an optimal combustion. At idle I'm steady, but I attribute that more to my EWP. At cruise in 6th gear, my temp will creep down to 170 or even 165 on the highway. Even when it's 115 outside and I'm in stop and go traffic with the AC on, it never gets above 195-200.
My fender air extractors are functional tho and I have the proper lower air baffle installed, factory filler panels on the rad support, weather stripping between my rad and support, and the factory air diversion flaps for the side of the radiator. I'm running a 12 core C&R radiator as well so YMMV.
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1969 Pontiac Firebird |
#7
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Quote:
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#8
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Mine crept too until I did the EWP. I tried a FlowKooler and had my plate spaced perfectly. Once I added the EWP, it never ever crept up again. I use a PWM controller for my fans and EWP. Best cooling upgrade I did.
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1969 Pontiac Firebird |
#9
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Quote:
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
The Following User Says Thank You to highrisk For This Useful Post: | ||
#10
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Try some more timing at idle.
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'65 Tempest 467 3650# 11.30@120.31 |
#11
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Already tried that, didn't do any good. The only thing that helps is a fan sitting in front of the car blowing in the radiator. It doesn't have to be much, but it starts dropping the temperature instantly. That is why I have decided I am just not moving enough air at idle.
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#12
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Dale. Get rid of that thermostat and put a stainless steel Napa Premium unit in.
Charles |
#13
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Quote:
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#14
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Dale. This is our part # here in Canada. Yes from Napa THM PM1800025
PRODUCT LINE : NAPA Thermostats IMPORTANT INFO : Temperature 180 deg. |
#15
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I’ve also been told never to push on the bellows on the stat as it damages it.
Also, you can always check operation in hot water with a thermometer-before installing. |
#16
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Quote:
Dale
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1969 428 Tremec 5 Speed U.S. Army Retired Retired Helicopter Pilot |
#17
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AC DELCO does make a 170 t stat.
Thermostat ratings are "Static" MOST working cooling systems will run 10 degrees above the static rating. This is your t stat / systems "Dynamic " rating. |
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