need manual switch button for both fans ????
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
need manual switch button for both fans ????
Hi
has anyone made a manual switch button for both fans
i would like to have one, that i can press forexample when in the pit between runs
is it any difficult to wire
just find the signal V wire on both fans and connect new wire in on it that goes to the button and from button back to 12V and to ground
so then not pressed then it gets its signal from PCM but when pressed it stays on
thanks
Baezi
has anyone made a manual switch button for both fans
i would like to have one, that i can press forexample when in the pit between runs
is it any difficult to wire
just find the signal V wire on both fans and connect new wire in on it that goes to the button and from button back to 12V and to ground
so then not pressed then it gets its signal from PCM but when pressed it stays on
thanks
Baezi
Le Mans Master
Joined: May 2007
Posts: 5,393
Likes: 17
From: Belleville Mich.
If your just wanting to run the fans between runs at the drag strip.
Here is a way to do it. FREE
Just keep the wire/pigtail in your console or glove box, when not needed.
http://www.rangeracceleration.com/C5_Fan_Trick.html
Here is a way to do it. FREE
Just keep the wire/pigtail in your console or glove box, when not needed.
http://www.rangeracceleration.com/C5_Fan_Trick.html
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
If your just wanting to run the fans between runs at the drag strip.
Here is a way to do it. FREE
Just keep the wire/pigtail in your console or glove box, when not needed.
http://www.rangeracceleration.com/C5_Fan_Trick.html
Here is a way to do it. FREE
Just keep the wire/pigtail in your console or glove box, when not needed.
http://www.rangeracceleration.com/C5_Fan_Trick.html
Baezi
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
ok if i go to PCM connector C1 BLUE
33 - DK BLU - 473 - High Speed Cooling Fan Relay Control
and tap into the wire connect it to a button whith straight to 12V and ground
i should be able to start the high fan when i wante
right ??
Baezi
33 - DK BLU - 473 - High Speed Cooling Fan Relay Control
and tap into the wire connect it to a button whith straight to 12V and ground
i should be able to start the high fan when i wante
right ??
Baezi
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
i did the relay jumper method, but i ran the wires (some thick-insulated speaker wire) around the back of the engine and into the cabin with my boost gauge reference then under the dash to my center console. the switch is on the front wall under the armrest just next to the power port. works like a champ
Last edited by _zebra; Aug 12, 2012 at 06:55 PM.
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Here is the fan wiring diagram:
At the PCM in the lower left you will see that all the PCM does to start the fans is ground C1-42 and C2-33. You will see at the top of the diagram that power to the associated fuses and relays for the fans are "HOT at ALL TIMES"
If you provide ground on both the DK GRN and DK BLU wires out of the PCM the fans should start in high mode.
Ground to only DK GRN starts both fans in low speed mode.
Ground to only DK BLU starts the the right fan in high speed mode but the left fan will not run. (requires ground of DK GRN to run)
At the PCM in the lower left you will see that all the PCM does to start the fans is ground C1-42 and C2-33. You will see at the top of the diagram that power to the associated fuses and relays for the fans are "HOT at ALL TIMES"
If you provide ground on both the DK GRN and DK BLU wires out of the PCM the fans should start in high mode.
Ground to only DK GRN starts both fans in low speed mode.
Ground to only DK BLU starts the the right fan in high speed mode but the left fan will not run. (requires ground of DK GRN to run)
Baezi
Melting Slicks
Joined: Mar 2002
Posts: 2,203
Likes: 63
From: Staten Island NY
http://rides.webshots.com/photo/1366...39559089xBqngr
Single toggle switch, up is one fan on - down is both fans. $10 in parts.
Scroll through the pictures.
Single toggle switch, up is one fan on - down is both fans. $10 in parts.
Scroll through the pictures.
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Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
http://rides.webshots.com/photo/1366...39559089xBqngr
Single toggle switch, up is one fan on - down is both fans. $10 in parts.
Scroll through the pictures.
Single toggle switch, up is one fan on - down is both fans. $10 in parts.
Scroll through the pictures.
i would wante the both fans on high speed
Baezi
Melting Slicks
Joined: Mar 2002
Posts: 2,203
Likes: 63
From: Staten Island NY
Tech Contributor
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Melting Slicks
Joined: Mar 2002
Posts: 2,203
Likes: 63
From: Staten Island NY
That's not how the fans work. GM achieved low speed fan operation by connecting them in series so that approximately 1/2 of 12 volts is dropped across each fan. That causes the fans to run slower than they were designed. In high speed mode they put the fans in parallel electrical connection so that each fan has 12 volts across it and each fan then runs at rated speed. If you have 12 volts across a factory fan it is NOT running at low speed but rather it is running at high speed.
If yours work differently then you either have some wiring other than factory or you have a problem... ie fan out, fuse out, relay failure or some wiring problem such as a short.
If yours work differently then you either have some wiring other than factory or you have a problem... ie fan out, fuse out, relay failure or some wiring problem such as a short.
Tech Contributor
Joined: Jan 2007
Posts: 19,422
Likes: 1,146
From: Dyer, IN
Kind of hard to evaluate proper operation, having taken the assembly out of the circuit. Consult the schematic above. The relays dictate whether the fans are in series....or parallel.
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
Here is the fan wiring diagram:
At the PCM in the lower left you will see that all the PCM does to start the fans is ground C1-42 and C2-33. You will see at the top of the diagram that power to the associated fuses and relays for the fans are "HOT at ALL TIMES"
If you provide ground on both the DK GRN and DK BLU wires out of the PCM the fans should start in high mode.
Ground to only DK GRN starts both fans in low speed mode.
Ground to only DK BLU starts the the right fan in high speed mode but the left fan will not run. (requires ground of DK GRN to run)
At the PCM in the lower left you will see that all the PCM does to start the fans is ground C1-42 and C2-33. You will see at the top of the diagram that power to the associated fuses and relays for the fans are "HOT at ALL TIMES"
If you provide ground on both the DK GRN and DK BLU wires out of the PCM the fans should start in high mode.
Ground to only DK GRN starts both fans in low speed mode.
Ground to only DK BLU starts the the right fan in high speed mode but the left fan will not run. (requires ground of DK GRN to run)
thanks
Baezi
Thread Starter
Burning Brakes
Joined: Apr 2009
Posts: 762
Likes: 2
From: Kopavogur in Iceland
If you ground both those wires the fans WILL start in high speed mode EVEN WITH THE KEY IN THE OFF POSITION. As I stated the power to the fuses and relays for the fans is ALWAYS hot.
So when you "push" your button to cause the ground without the engine running, you had better remember to "unpush" your button or you will kill the battery in short order.
So when you "push" your button to cause the ground without the engine running, you had better remember to "unpush" your button or you will kill the battery in short order.
took DRK blue 33 on green connector and DRK Grn 42 on the blue connector to ground (this is a 2004 PCM)
but i only get one fan running !!!! the passenger side fan it runs in high mode the other is just stop
but i hear both relays click
but only one running and i need to have the switch power on, it don´t run otherwise
what is wrong here
Baezi
Le Mans Master
Joined: Oct 2010
Posts: 7,373
Likes: 1,128
From: cold & windy
not necessarily. i've ran mine for 4-5 hours at a time with no adverse effects. that said... i sure wouldn't try running them all night or anything
Drifting
Joined: Jul 2003
Posts: 1,253
Likes: 1
From: East China MI
If you ground both those wires the fans WILL start in high speed mode EVEN WITH THE KEY IN THE OFF POSITION. As I stated the power to the fuses and relays for the fans is ALWAYS hot.
So when you "push" your button to cause the ground without the engine running, you had better remember to "unpush" your button or you will kill the battery in short order.
So when you "push" your button to cause the ground without the engine running, you had better remember to "unpush" your button or you will kill the battery in short order.
Last edited by jpatrick636; Jun 29, 2015 at 05:07 PM.
Le Mans Master
Joined: Feb 2004
Posts: 8,629
Likes: 16
From: York PA
Hope you guys realize, without an electric water pump running also, you're wasting your time.
The same switch (I call it a pit switch) that grounds the fans can also ground a relay for the electric water pump.
Takes about 5 minutes to drop temp 50*
The same switch (I call it a pit switch) that grounds the fans can also ground a relay for the electric water pump.
Takes about 5 minutes to drop temp 50*