Does anyone know why you should put a relay in when installing an electric cooling fan? Is it really necessary?
Old Scout said:
Were is the power coming from? Your fuse panel? Use a relay or stand the chance of :nuke: your wiring harness!
What Engine??? I would get a fan switch. There mounted in the radiator of most FWD cars. I used a fan switch from a dodge that closed at 180F and opened at 170F. You could drill and tap your T-stat housing for the mount. BTW use a relay the switch can only handle 2 amps!Maine Jeepah said:HIHACK!!!!!
[hijack] Next electric fan related question.
Where do you all locate your thermostats?
I currently have an adjustable one with the sensor mounted on the inner side of the radiator, and its a bear to keep it adjusted right because when the air temps are really cold the rad is the last thing to get hot...but the engine temp goes up past Normal running temp...I've had it up past 210 on a cold day (high RPM runs in the snow)...still didnt kick on...on a normal 50*+ day it would maintain the motor at 195* or less.
When I adjust it for "NORMAL" ambient temps and run in them it works fine.
Ideally I would like to mount it so it gets the temperature of the actual coolant, like the one thats screwed into my manifold. (aftermarket)
Dont know how to make the fan therm sensor into the type that my guage uses, or if maybe the one from the guage could swap to the fan thermostat.
Would mounting to the outside of the manifold be better/easy?
I think it would be more ideal.
Any ideas or suggestions?
I was planning to put my switch on the outlet side of the radiator. My logic(perhaps twisted) is that I am concerned with the temp of the coolant going into the engine. Seems to me that the temp of the coolant going into the engine is what the fan has the most control over. If the engine is hot and the coolant coming in is relatively cool I don't see how the fan will really help. This logic of mine was agreed to by the guy fabbing up my radiator. He is welding in bungs for temp sensors(dual fans) on the outlet side of rad tank.Lloyd said:IMHO the best place for a fan switch is the cylinder head. An intake manifold port would be acceptable too.
When I tried that method before, it ran the same way (if I remember right). I might try it again when I replace the radiator. My fan can barely keep up, it is the exacty same fan he is running.Maine Jeepah said:I just found a couple of write ups (Chebby stuff) where they took a adjustable therm probe and put it in through the top rad. hose, and clamped down around the wire. (used some silicone to seal it I guess ) http://www.geocities.com/MotorCity/Garage/6776/radfan.html