XJS electric fans on a budget
#1
XJS electric fans on a budget
I know it is not the best looking solution, but sure as hell it is functional and a lot more cost effective then $600 eBay option.
Long story short, 5 series (e39) 2 speed fan housing gets trimmed to fit in XJS fan opening. Than plastic fan housing gets screwed around, with 4-6 screws every 90, or 60 degrees, lastly gaps all around get filled with high density window insulation foam.
To make out side presentable, I covered foam with liquid electric tape + some flat black spray paint.
Electric system is based on 3 relays and rather simple.
relay one - accessory fan power (the small one)
relay two - main fan half speed
relay three - main fan full speed
System is fed off left 12v terminal on firewall and actuated off any ignition switcheable terminal in left front corner. I think I used horn relay's solid green wire.
When ignition is on, main fan spins half speed all the time, however when thermo switch (located near water pump) is engaged, small fan kicks on and main fan switches to full speed.
This system is simple and works extremely well, even on the hottest day in traffic.
Long story short, 5 series (e39) 2 speed fan housing gets trimmed to fit in XJS fan opening. Than plastic fan housing gets screwed around, with 4-6 screws every 90, or 60 degrees, lastly gaps all around get filled with high density window insulation foam.
To make out side presentable, I covered foam with liquid electric tape + some flat black spray paint.
Electric system is based on 3 relays and rather simple.
relay one - accessory fan power (the small one)
relay two - main fan half speed
relay three - main fan full speed
System is fed off left 12v terminal on firewall and actuated off any ignition switcheable terminal in left front corner. I think I used horn relay's solid green wire.
When ignition is on, main fan spins half speed all the time, however when thermo switch (located near water pump) is engaged, small fan kicks on and main fan switches to full speed.
This system is simple and works extremely well, even on the hottest day in traffic.
Last edited by Mish_Mish; 03-05-2013 at 09:46 PM.
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fritzvis (03-05-2013)
#2
#3
#4
I can draw a diagram sometime. Totally agree on the blades, one of mine flew off and severed radiator, plus another one brazed my father's in law neck.
The following users liked this post:
fritzvis (03-06-2013)
#5
#6
Greetz,
Frederik
#7
The main power for the fan is best taken from the bulkhead post, while the low current power for the thermostat can be taken from any ignition-switched source (mine comes from the + feed to the coil).
The thermostat options you have are many, but if you are buying a new radiator, it is an ideal time to select a thermostat system and have the radiator maker weld a boss into the new radiator to screw a thermostat sensor into. Towards the bottom of the radiator just by the outlet is best IMO, as at the top the temperature is very variable and the system can keep switching on and off every few seconds and blow the switching on and off relay. Or you can use the OE thermostatic switch on the water pump inlet, and easily rewire the existing small electric fan to come on with the aircon permanently. When the time comes, loads of people will help with the wiring.
Greg
Last edited by Greg in France; 03-06-2013 at 07:50 AM.
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#8
I believe I used E36, or E39 A/C pusher fan, the one that goes infront of the radiator assembly. These are 2 speed, which is important because in normal driving conditions full speed never kicks in, while half speed is enough to keep A/C working well. Otherwise, one would have to complicate system with large fan to kick on full speed, when a/c is engaged.
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