05-06 ZX6R Temp Jumps around - ZX6R Forum
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post #1 of 9 Old 07-15-2019, 07:39 AM Thread Starter
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05-06 ZX6R Temp Jumps around

Hello all!!

just recently I done the dual fan install mod to a switch. It worked fantastic and highly recommend it to anyone who often gets stuck in traffic/ at lights. Not even kidding it kept the bike around 25 degrees cooler.
The fan set up still works flawlessly. it turns on with the ECU at 212 or i can over-ride the fans by turning them on with my switch (like when i see traffic or a light up ahead). After having this mod installed for a week, starting yesterday, my temp reading on my cluster jumps around. It will be at 208 then instantly jump to 186. then sit in the 186-190ish area, then instantly spike up to 214 then jump back down then up etc etc.
i have a hunch that my water temp sensor is bad and i am posting here to double check before ordering the part and taking the bike apart to get to the sensor.
has this happened to anyone else?
also, just to clarify, the part number i think i will need to replace is "21176-1120"

thank you in advance!
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post #2 of 9 Old 07-15-2019, 07:51 AM
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Quote:
Originally Posted by zixxsixxer View Post
Hello all!!

just recently I done the dual fan install mod to a switch. It worked fantastic and highly recommend it to anyone who often gets stuck in traffic/ at lights. Not even kidding it kept the bike around 25 degrees cooler.
The fan set up still works flawlessly. it turns on with the ECU at 212 or i can over-ride the fans by turning them on with my switch (like when i see traffic or a light up ahead). After having this mod installed for a week, starting yesterday, my temp reading on my cluster jumps around. It will be at 208 then instantly jump to 186. then sit in the 186-190ish area, then instantly spike up to 214 then jump back down then up etc etc.
i have a hunch that my water temp sensor is bad and i am posting here to double check before ordering the part and taking the bike apart to get to the sensor.
has this happened to anyone else?
also, just to clarify, the part number i think i will need to replace is "21176-1120"

thank you in advance!
If it's changing drastically, suddenly, I would suspect a wiring problem more than the sensor. Check the connection before you buy anything. Inspect your work and any wires you disturbed. Betting on a loose contact.

"Basic stuff fellas. Use your head for something other than to break your next fall."
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post #3 of 9 Old 07-15-2019, 08:15 AM Thread Starter
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besides soldering the two fans together, the only wire i messed with was adding a switch to the black with blue wire in the relay section in the rear of the bike(see thumbnail). So the only wiring i messed with was one for the fans. or would it??

for reference: i used this video and at the 9:15 mark the gentleman explains which wire he used.

thank you RJ
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Last edited by zixxsixxer; 07-15-2019 at 08:22 AM.
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post #4 of 9 Old 07-15-2019, 08:46 AM
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Could be any number of loose or corroded contacts in a plug body. Clean and re seat is always advisable... Doping any connector you take apart with dielectric grease is good housekeeping, and drastically reduces random inconsistency.

If you jiggled that connector on the relay, you were right by the ECU connection as well. Take each one loose, flood with dielectric grease, and re seat. Can't make it worse....

"Basic stuff fellas. Use your head for something other than to break your next fall."
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post #5 of 9 Old 07-15-2019, 11:52 AM
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Could also be air trapped in your coolant.
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post #6 of 9 Old 07-15-2019, 01:14 PM
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If the radiator was removed and reinstalled, that's another very strong probability.

"Basic stuff fellas. Use your head for something other than to break your next fall."
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post #7 of 9 Old 07-15-2019, 01:50 PM Thread Starter
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the radiator was removed. any tips to get air pockets out of it??
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post #8 of 9 Old 07-15-2019, 03:24 PM Thread Starter
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So it turns out that the fans do not turn on at 212 anymore. I swapped out the relay box with an extra one that came with an ECU I bought last year. No change. I also swapped the ECU and no change either. It has to be wiring I guess. I checked the fuses too. And I burped the coolant lines
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post #9 of 9 Old 07-15-2019, 04:43 PM
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Running the bike at idle with the radiator cap off, so you can see the coolant...... run it until you see the coolant moving in the radiator -- that means the thermostat has opened up and all parts of the cooling system are flowing coolant. Once that happens, repeatedly squeeze each section of hose so you force a slug of coolant to change places. The routing of coolant hoses on the ZX6 always seems to include at least one section that has a n shape to it, that can trap air. Burping the system is meant to collapse that air bubble and fill that space with coolant so there are no gaps in the flow.

If the fans never turn on, but the temps read consistently, the problem may be in the wiring. On the side going back to the battery (-). This usually involves a wire bolted to the frame, and the frame then carrying the current back to the battery. That bolted together wire and the frame is a serious candidate for rust. Steel bolt, plated copper terminal, aluminum frame...... tailor made for galvanic corrosion. Add water and dirt, and you have a wet cell battery.

Take the grounds apart, and wire brush everything shiny and clean. Then, dope them with dielectric grease, and put it all back together.

Let us know if that helps.

"Basic stuff fellas. Use your head for something other than to break your next fall."
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