e38 with dual electric fans
#1
e38 with dual electric fans
Is there a wiring diagram for this? e38 came out of an 08 express 3500 with a mechanical fan. As I understand it, I can add pins to 17 and 58 on the X1 connector for relay control. This would be for a 1994 Chevy b body swap.
I found a diagram for an 08 escalade that uses 4 relays. I am planning on integrating the factory 94 underhood fuse/relay box. The box has 2 relays for the cooling fans. Any help??? THANKS!
I found a diagram for an 08 escalade that uses 4 relays. I am planning on integrating the factory 94 underhood fuse/relay box. The box has 2 relays for the cooling fans. Any help??? THANKS!
#3
TECH Senior Member
iTrader: (7)
A sexier way of doing it with the E38 ECU is to control the fans via PWM:
http://www.lateral-g.net/forums/showthread.php4?t=40215
Andrew
http://www.lateral-g.net/forums/showthread.php4?t=40215
Andrew
#4
TECH Addict
iTrader: (2)
You can actually use a PWM module from a Chrysler minivan if you're on a budget. The module is around $30 new at the parts store and even less in the salvage yard. PWM fans on a budget.
#5
Hmmm, the pwm is very interesting. Does anyone have the diagram for an e38? I think its still pin 58 for the pwm, but what about the ac? I have a factory pressure switch that uses the same connector as the vette I believe. What are the chances my sensor is compatible? Its the same 5v style high/ low/ signal style.
Also, seeing as I have to convert to manual ac (which I still have no idea how to do), that sensor wouldn't get used anyways?
As far as budget and the chrysler controller....it started out as a budget build. That turned into a different car and different engine/trans/axle, etc... But if the chrysler controller does the same thing....
My car now with the lt1 had 2 relays and 2 40amp maxi fuses for the fans. I know the pwm controller doesn't use a relay. I believe both fans are each 150w. Will the chrysler controller do both fans on one 40 amp fuse? Should be no startup amp spike being pwm? Thanks for the help!!!!
Also, seeing as I have to convert to manual ac (which I still have no idea how to do), that sensor wouldn't get used anyways?
As far as budget and the chrysler controller....it started out as a budget build. That turned into a different car and different engine/trans/axle, etc... But if the chrysler controller does the same thing....
My car now with the lt1 had 2 relays and 2 40amp maxi fuses for the fans. I know the pwm controller doesn't use a relay. I believe both fans are each 150w. Will the chrysler controller do both fans on one 40 amp fuse? Should be no startup amp spike being pwm? Thanks for the help!!!!
#6
TECH Senior Member
iTrader: (7)
Hmmm, the pwm is very interesting. Does anyone have the diagram for an e38? I think its still pin 58 for the pwm, but what about the ac? I have a factory pressure switch that uses the same connector as the vette I believe. What are the chances my sensor is compatible? Its the same 5v style high/ low/ signal style.
Also, seeing as I have to convert to manual ac (which I still have no idea how to do), that sensor wouldn't get used anyways?
As far as budget and the chrysler controller....it started out as a budget build. That turned into a different car and different engine/trans/axle, etc... But if the chrysler controller does the same thing....
My car now with the lt1 had 2 relays and 2 40amp maxi fuses for the fans. I know the pwm controller doesn't use a relay. I believe both fans are each 150w. Will the chrysler controller do both fans on one 40 amp fuse? Should be no startup amp spike being pwm? Thanks for the help!!!!
Also, seeing as I have to convert to manual ac (which I still have no idea how to do), that sensor wouldn't get used anyways?
As far as budget and the chrysler controller....it started out as a budget build. That turned into a different car and different engine/trans/axle, etc... But if the chrysler controller does the same thing....
My car now with the lt1 had 2 relays and 2 40amp maxi fuses for the fans. I know the pwm controller doesn't use a relay. I believe both fans are each 150w. Will the chrysler controller do both fans on one 40 amp fuse? Should be no startup amp spike being pwm? Thanks for the help!!!!
I can't speak for the Chrysler fan controller, but the C6 fan is 400w, so the C6 fan controller will easily handle both of your fans. The C6 fan controller range is 5-90% duty cycle. I am using this combination on my 67 Cougar build, but with the Holley Dominator ECU.
Andrew
#7
TECH Apprentice
This is how I used on an E38 with a hi/low speed fan should work for two fan setup. I have not added the third relay for the AC yet, but it has been working fine. I don't think my fan has ever been required to go into hi speed other than when I was testing the system.
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#8
I am going to go with the c6 pwm controller. Car originally had 1 40 amp maxi fuse and 1 relay for each fan. As far as I know the wires are 14 gauge. Will one wire on a a single 40 amp fuse (that was originally for one fan) run both fans safely through the controller?
#9
TECH Senior Member
iTrader: (7)
In the picture that I posted you can see the connector that I wired. It is a Metri-Pack series 480 3 cavity connector which is rated at 42 amps max.
Andrew
#10
A sexier way of doing it with the E38 ECU is to control the fans via PWM:
http://www.lateral-g.net/forums/showthread.php4?t=40215
Andrew
http://www.lateral-g.net/forums/showthread.php4?t=40215
Andrew
Why is adding complexity of a PWM controller better? I will soon be wiring 2 fans up with a E38. If the E38 can control 2 fans with dedicated outputs then why the fuss?
#11
TECH Resident
With my doors and windows closed and exhaust rumble I don't hear my fan on high (I only have high speed wired). I have AC so commonly I do have the cab shut tight.
Still, many folks are Hot Rodders here. If you can make it better why not? And it doesn't cost much more than a multiple high current relay setup.
I may make this conversion one day when I'm bored
Doug
#12
TECH Senior Member
iTrader: (7)
Andrew