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6/17/09 11:08pm - Original Message: 'Sending units for electric fans'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
I learned me an imortant lesson this weekend. If yer lectric fan has a sensor at 180 degrees and you have a 160 degree thermostat, yer fan wont stop a runnin!! The 160 closes again at about 150 so it never really closes and the fan just keeps a runnin cuz the water aint a gittin that cool and the thermostat hangs open......I swithced my thermostat tonite and hopin this cures the problem. Wacko
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6/18/09 1:02pm - Reply: 'Sending units for electric fans'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

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Huh?
If you have a 180* fan sensor, then the fan is supposed to run anytime the temp gets above that temp, regardless of the thermostat calibration. Of course, if there is a prollem with the thermo, then that could cause the fan to run all the time too....but it don't make sense if the engine temp is 160*
now I'm cornfused....again...


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6/18/09 6:40pm - Reply: 'Sending units for electric fans'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Lets just say if having a 180 stat and a 180 sensor help the fan cycle instead of running constantly, I bees a happy fool!!

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6/18/09 6:51pm - Reply: 'Sending units for electric fans'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
Paul, the fan sensor has a high & low limit, fans come on at high limit and turn off at low limit. Your thermostat should be below the low limit.
I think 180 turn on temp. is too low. Mine turns on at 200 and off at 185, my thermostat is 180.
Drive the car without the fans on and see what the normal operating temp is. Your fans should come on just above that and turn off about 15 degress less.
My fans only come on when in traffic for awhile, never on the highway. I have a manual switch so I can turn them on when my A/C is on so there is always air flowing over the A/C condensor, but you don't have to worry about that.
Dave
DaveM2009-06-18 16:04:37

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6/19/09 5:38pm - Reply: 'Sending units for electric fans'
eddie20875 Lifetime Member
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Lanoka Harbor, NJ - USA

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1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c

Joined: 12/21/2006
Posts: 828
dave is right about the temp of stat. made the mistake of not switching the stat when i installed my fans. then realizes the problem and corrected it. my fans turn on about 200 and off about 185 (numbers are close). the original stat was 195 on my 75. as with dave my fans dont always come on unless it is really hot outside.

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6/19/09 9:19pm - Reply: 'Sending units for electric fans'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Took a ride tonight with the 180 stat. - fans still kicking on around 160 and staying on. maybe I should go to a 195 Sensor and stay with the 160 stat. Thoughts?

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6/19/09 9:58pm - Reply: 'Sending units for electric fans'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
What is the on temp. and off temp. on the sensor? Didn't they come with a schematic? If yours are coming on at 160 you may have them wired wrong, thats way to low to be turning on.
Dave


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6/19/09 10:10pm - Reply: 'Sending units for electric fans'
eddie20875 Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c

Joined: 12/21/2006
Posts: 828
they do make different sensors for the fans. i remember you had the fans before the new engine--do you remember when it came on then. if it was right before maybe dave is right about being wired wrong or more than likely the sensor is bad or was wrong to begin with. i would see if i could get a new sensor for it.

just another thought here--how accurate is the temp guage you are going by. best thing would be to check the temp of the engine with an infared thermometer.
eddie208752009-06-19 19:13:27

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6/19/09 10:40pm - Reply: 'Sending units for electric fans'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804

Wired the same as it was with the 327. Operated normally. I'll check the paperwork on the relay and let yous guys know.



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6/20/09 10:43am - Reply: 'Sending units for electric fans'
DaveM Lifetime Member
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Flanders, NJ - USA

Vette(s):
1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2530
Hey Paul, I just e-mailed you a copy of the instructions from my Spal fans, maybe it will help?
Dave


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6/20/09 9:29pm - Reply: 'Sending units for electric fans'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Thanks Dave. Shot you an email back. Wiring seems ok - wondering if the sensor is bad...

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9/5/09 5:20pm - Reply: 'Sending units for electric fans'
lukesvette Lifetime Member
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HOWELL, NJ - USA

Vette(s):
1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.

Joined: 5/18/2004
Posts: 6804
Well, tried a different 180 stat finally and problem solved. Fans cycle and you can see the stat opening and closing via the temp gauge. I dont' quite understand the mechanics of what happened but, all's well that ends well!!

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9/5/09 5:42pm - Reply: 'Sending units for electric fans'
eddie20875 Lifetime Member
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Lanoka Harbor, NJ - USA

Vette(s):
1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c

Joined: 12/21/2006
Posts: 828
paul, great to here it working right. know i had to change my stat so my fans would cycle the right way. they turn on at 195 and off at about 185. hope you are making up for lost time and driving it all over. Thumbs Up

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