adjustable coolant fan temp switch ? where
Thread Starter
Instructor
Joined: Jun 2010
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From: phx az
adjustable coolant fan temp switch ? where
could u guys point me in the right direction , i wanna be able to adjust my coolant fan to a certain temp when it turns on ,
i guess stock it turns on at 225? ...thats hi i wanna turn it down to 200 or so ..right?
thx 4 the input
what do i need and where do i get it ..thanks alot
i guess stock it turns on at 225? ...thats hi i wanna turn it down to 200 or so ..right?
thx 4 the input
what do i need and where do i get it ..thanks alot
Le Mans Master
Joined: Aug 2000
Posts: 8,838
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From: Australia
The only ones that are adjustable ( and cheap ) are the ones that have a probe that fits in the top radiator hose.They have a adjustment that lets you set temp.
http://www.summitracing.com/parts/FLX-31147/
Most people just install a fixed switch in the head that gives the desired operating range ,wire that to the relay bypassing the computer control and don't worry about adjusting it
http://www.mamotorworks.com/corvette...20fan%20switch
Of course there are more expensive fully electronic adjustable units
http://www.summitracing.com/parts/DAK-PAC-2700/
http://www.summitracing.com/parts/FLX-31147/
Most people just install a fixed switch in the head that gives the desired operating range ,wire that to the relay bypassing the computer control and don't worry about adjusting it
http://www.mamotorworks.com/corvette...20fan%20switch
Of course there are more expensive fully electronic adjustable units
http://www.summitracing.com/parts/DAK-PAC-2700/
Last edited by rodj; Jun 15, 2010 at 10:59 PM.
Racer
Joined: Mar 2010
Posts: 291
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From: Temecula Cali
ok, your fan is controlled by a cooling fan switch, and it's set to switch on at 108C (226 deg).
you can go three routes from what i can tell...
1. manual override switch - tap into the field lead of the cooling fan relay harness and connect up a toggle switch, one wire to the tapped wire, the other to ground (grounding out the field lead on your relay activates the fan)
2. low temp cooling fan switch - There is a 100C (212 deg) temp cooling fan switch that fits where the original one goes, GM p/n 3053190.
3. aftermarket cooling fan thermostat kit - you can piggyback this into one of the fan circuits and make it adjustable.
Hope that helps.
you can go three routes from what i can tell...
1. manual override switch - tap into the field lead of the cooling fan relay harness and connect up a toggle switch, one wire to the tapped wire, the other to ground (grounding out the field lead on your relay activates the fan)
2. low temp cooling fan switch - There is a 100C (212 deg) temp cooling fan switch that fits where the original one goes, GM p/n 3053190.
3. aftermarket cooling fan thermostat kit - you can piggyback this into one of the fan circuits and make it adjustable.
Hope that helps.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
The original switch ( if fitted ) only controls the aux fan in front of radiator.New switch needs to be wired to the main fan to control that as well
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Racer
Joined: Mar 2010
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From: Temecula Cali
if that's true thats an easy fix, just swap out the primary/secondary field wires between the two relays, or run a jumper connecting them both together so they come on at the same time.
Le Mans Master
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From: Australia
Main fan in '87 is controlled by the ECM. Only '84 had main fan from mech switch
IF you have a Aux fan fitted in front of radiator there will be a existing switch in the drv side head between # 1 and 3 spark plugs.
If not that, plugged hole is where you new switch goes
IF you have a Aux fan fitted in front of radiator there will be a existing switch in the drv side head between # 1 and 3 spark plugs.
If not that, plugged hole is where you new switch goes
Thread Starter
Instructor
Joined: Jun 2010
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From: phx az
thx
Le Mans Master
Joined: Aug 2000
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From: Australia
You splice into the wire that goes to the computer from fan relay
( that way the computer will still run your fan if the switch fails ) and connect that wire to the new switch along with the old wire
( if you have aux fan )
Requires running a new wire from main fan relay to switch in head
Last edited by rodj; Jun 16, 2010 at 04:29 AM.
Thread Starter
Instructor
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From: phx az
ok so sum vettes have 2 fans 1 on each side of the radiator?
so if i wanna turn it on sooner run a hot wire to the one wire ur talking bout so i can turn fan on when ever, just a toggle switch and sum wire? ...
so if i wanna turn it on sooner run a hot wire to the one wire ur talking bout so i can turn fan on when ever, just a toggle switch and sum wire? ...
Le Mans Master
Joined: Aug 2000
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From: Australia
It is a wire to ground to turn the relay on.
Same way as above ,just that you run the wire inside to a switch that goes to ground
Turn the switch on ; fan runs.
Switch off ;the computer runs the fan
Thread Starter
Instructor
Joined: Jun 2010
Posts: 112
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From: phx az
ahhhh ok so get a good ground connect it , then to switch , then run another wire from switch the relay , then when i turn switch on , making the 1 wire a good ground , it will turn the fan on..? then im set right? ..
Le Mans Master
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From: Australia
Racer
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From: Temecula Cali
For what it's worth, I just installed a low temp fan switch and wired it into my secondary fan of my '94, and it's working great.
Since the LT1 doesn't have a cooling fan switch sensor between #1 and #3, I installed a kit consisting of a brass tee, a 212 deg (+/- 8 degrees according to specs) GM fan switch, the electrical sensor wire connector, and wire tap for the relay field wire (dark blue for secondary, dark green for primary).
Now, the temp gauge reads 207 deg. when the fan switch kicks on and shuts off at 197 deg. No more 230 degree stoplights!
Rob
Since the LT1 doesn't have a cooling fan switch sensor between #1 and #3, I installed a kit consisting of a brass tee, a 212 deg (+/- 8 degrees according to specs) GM fan switch, the electrical sensor wire connector, and wire tap for the relay field wire (dark blue for secondary, dark green for primary).
Now, the temp gauge reads 207 deg. when the fan switch kicks on and shuts off at 197 deg. No more 230 degree stoplights!
Rob
Last edited by chileverde; Jun 16, 2010 at 09:21 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia