Topic: SPAL fans intermittent
in Forum: C3 Cooling and Heating Systems
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Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
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
great to hear it. you are so right, that something like that can
really get to you and it winds up being a simple solution.
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Way to go Dude. Makes a lot more sense than a little teflon tape on the sensor. Always remember to bleed out air when filling system.
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Willow Grove, PA - USA
Joined: 10/27/2006
Posts: 232
Vette(s): 1974 Stingray Coupe LS4 454 Dark Brown Metallic with Deluxe Saddle interior
What do you do to bleed it out? My uncle always said to run it a few mins with the rad cap off....
I chose to just fill it and run it with the cap on.... then check the water after it cooled.
What I do is run the engine with the cap off until the stat opens. The level should drop down. Then I throttle it a few times, hold the rpms up while I top it to the fill line and cap it. After I drive for a while and it cools down, I check the level. From there you should be good to go.
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Willow Grove, PA - USA
Joined: 10/27/2006
Posts: 232
Vette(s): 1974 Stingray Coupe LS4 454 Dark Brown Metallic with Deluxe Saddle interior
Hum, sounds just like what my unlce used to do.....
sounds like a plan! thanks 7T1

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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
If you drill a small, 1/8" hole in the flat surface of the thermostat, it will allow you to fill the system with no problems, as this will create an "air bleed". You'll find that most thermostats you buy today have this hole, just for this reason.
The old method of running till the 'stat opens, then filling the radiator is a tried and true way to do it. It's also a good idea to have a recovery system, as this will let the engine take in what it needs as you drive.
Glad you got it fixed!!!
The old method of running till the 'stat opens, then filling the radiator is a tried and true way to do it. It's also a good idea to have a recovery system, as this will let the engine take in what it needs as you drive.

Glad you got it fixed!!!

Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
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
More wear & tear on them, as well as the alternator/charging system, for one. Plus, they don't really need to be running all the time.
At road speed, you can have enough air coming thru the rad. to actually fight against the fans, trying to spin them faster than they normally turn. This can create undue stress on the fan motor(s).
A better set-up, if you don't want to go with the temp. activated method is to just wire them thru an "On-Off" switch and relay, but you have to make sure the fans are on when they need to be on...
At road speed, you can have enough air coming thru the rad. to actually fight against the fans, trying to spin them faster than they normally turn. This can create undue stress on the fan motor(s).

A better set-up, if you don't want to go with the temp. activated method is to just wire them thru an "On-Off" switch and relay, but you have to make sure the fans are on when they need to be on...

Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
I highly recommend using the temperature sending unit for the fan setup as the source of power for the fans. I have dual spal fans in the 69 Corvette and the 69 Camaro. The sending units for both cars are installed in the intake manifolds. Some people wire them separately to come on and go off at diferent temps. Both of my fans are run parallel. They come on when they are needed (200) and shut off when the temp is below 190.
in Forum: C3 Cooling and Heating Systems
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