COOLING FAN NOT COMING ON?
Moderator: rztom
COOLING FAN NOT COMING ON?
HI GUYS,
CAN ANYONE GUIDE ME IN THE RIGHT DIRECTION?
THE PREVIOUS OWNER OF THIS BIKE HAS INSTALLED WIRES TO BYPASS THE THERMO FAN SWITCH, SO WHEN THE MANUAL SWITCH IS THROWN THE FAN COMES ON.
SO I ASSUMED THAT THE THERMO FAN SWITCH WAS NOT WORKING AND REPLACED IT HOPING TO HAVE THE SYSTEM RUN AUTOMATICALLY AS IT SHOULD, BUT IT DOES NOT.
ANY IDEAS? WHAT ELSE COULD CAUSE THE FAN NOT TO COME IN WHEN REQUIRED, IS THERE ANOTHER SWITCH OR RELAY?
COULD THESE EXTRA WIRES BE CAUSING THE PROBLEM?
KIND REGARDS, Craig
CAN ANYONE GUIDE ME IN THE RIGHT DIRECTION?
THE PREVIOUS OWNER OF THIS BIKE HAS INSTALLED WIRES TO BYPASS THE THERMO FAN SWITCH, SO WHEN THE MANUAL SWITCH IS THROWN THE FAN COMES ON.
SO I ASSUMED THAT THE THERMO FAN SWITCH WAS NOT WORKING AND REPLACED IT HOPING TO HAVE THE SYSTEM RUN AUTOMATICALLY AS IT SHOULD, BUT IT DOES NOT.
ANY IDEAS? WHAT ELSE COULD CAUSE THE FAN NOT TO COME IN WHEN REQUIRED, IS THERE ANOTHER SWITCH OR RELAY?
COULD THESE EXTRA WIRES BE CAUSING THE PROBLEM?
KIND REGARDS, Craig
COOLING FAN NOT COMING ON?
HI ANDREW,
SWITCH IS BRAND NEW, JUST FITTED.
COULD ANYTHING ELSE CAUSE THE PROBLEM?
CRAIG
SWITCH IS BRAND NEW, JUST FITTED.
COULD ANYTHING ELSE CAUSE THE PROBLEM?
CRAIG
It is a rather simple circuit. Positive Power flow from the YPVS fuse in the fusebox goes straight to the thermo switch (and ypvs of course). You should be able to use a voltmeter and have battery voltage at the thermo switch, brown wire with the key on. From the switch through the blue wire to the fan motor itself. Fan motor has a black wire which goes to ground back to the battery. Check for power at the thermo switch, and at the fan motor when the switch is closed. Check for continuity on the ground side of the motor.
Keep in mind the thermo switch does not close until water temp is 208-221 degrees Fahrenheit. The old story (not mine) is that Yamaha did not switch on the cooling fan until absolutely necessary as when the fan was on, the charging system ran at a deficit. That would cause the battery to go dead in a rather short period if the fan was running, especially if the headlight is on. The charging system only puts out about 15 amps.
This is why a lot of guys would bypass the thermo switch and use a manual switch to turn on the fan sooner, keeping the engine cooler.
To test the thermo switch, rig a way to suspend it in hot water in a pan on the stove with a thermometer, and an ohmmeter to the connections. It should read infinity when open (below 208 degrees F.) and close to 0 ohms when closed (208-221 degrees F.)
Good Luck!
Keep in mind the thermo switch does not close until water temp is 208-221 degrees Fahrenheit. The old story (not mine) is that Yamaha did not switch on the cooling fan until absolutely necessary as when the fan was on, the charging system ran at a deficit. That would cause the battery to go dead in a rather short period if the fan was running, especially if the headlight is on. The charging system only puts out about 15 amps.
This is why a lot of guys would bypass the thermo switch and use a manual switch to turn on the fan sooner, keeping the engine cooler.
To test the thermo switch, rig a way to suspend it in hot water in a pan on the stove with a thermometer, and an ohmmeter to the connections. It should read infinity when open (below 208 degrees F.) and close to 0 ohms when closed (208-221 degrees F.)
Good Luck!
RZ500
RD400
Whether you think you can, or you think you can't, either way, you are right -Henry Ford
RD400
Whether you think you can, or you think you can't, either way, you are right -Henry Ford
COOLING FAN NOT COMING ON?
You may be on to something there with the temperature, but I let it get really hot, nearly upto the red zone, surely this would be time for it to cut in?
While riding it it did not get over hot, only while idling after the ride, waiting for the fan to cut in.
I will try to find exactly where these extra wires are attached and make a more informed thread if I don't fix it first.
God it was fun to ride for the first time though, stuff the greenies and their polution policies!
Nothing better than fresh TTS smell! Though I believe MOTUL even better!
While riding it it did not get over hot, only while idling after the ride, waiting for the fan to cut in.
I will try to find exactly where these extra wires are attached and make a more informed thread if I don't fix it first.
God it was fun to ride for the first time though, stuff the greenies and their polution policies!
Nothing better than fresh TTS smell! Though I believe MOTUL even better!
As I remember it wouldn't go on until the red zone.......not exactly what any 500 owner would want. Another reason for the manual switches.
I'm curious what the extra wires are for, one thing for sure, it's not the fan.
I'm curious what the extra wires are for, one thing for sure, it's not the fan.
RZ500
RD400
Whether you think you can, or you think you can't, either way, you are right -Henry Ford
RD400
Whether you think you can, or you think you can't, either way, you are right -Henry Ford
COOLING FAN NOT COMING ON?
THE EXTRA WIRES ARE SPLICED INTO THE WIRES COMING OFF THE SWITCH TO ATTACH A MANUAL OVERIDE SWITCH TO, AT THE MOMENT THERE IS A MALE TERMINAL & A FEMALE TERMINAL AND YOU JUST JOIN THEM TO MAKE THE CIRCUIT AND THE FAN COMES ON.
I WILL MOUNT A SWITCH WITH A LIGHT SO IT IS CLEARLY VISIBLE AND ONLY USE IT WHEN IN SLOW TRAFFIC.
WHILE MOVING ALONG AT 60KM PLUS THE RUNNING TEMP IS IN THE LOWER THIRD OF THE GAUGE.
THANKS FOR THE INPUT EVERYONE, I THINK THE CASE IS CLOSED.
KIND REGARDS, CRAIG
I WILL MOUNT A SWITCH WITH A LIGHT SO IT IS CLEARLY VISIBLE AND ONLY USE IT WHEN IN SLOW TRAFFIC.
WHILE MOVING ALONG AT 60KM PLUS THE RUNNING TEMP IS IN THE LOWER THIRD OF THE GAUGE.
THANKS FOR THE INPUT EVERYONE, I THINK THE CASE IS CLOSED.
KIND REGARDS, CRAIG
Hi there
Take a look in the old discussion:
http://www.rzrd500.com/500phpBB3/viewto ... ght=nissan
/Steen
Take a look in the old discussion:
http://www.rzrd500.com/500phpBB3/viewto ... ght=nissan
/Steen
If I had a signature, it would be good.