Help, please! Engine overheating 🥵

[Steff]

I have an ongoing problem with my 22GT. I have taken it to two different dealerships and they have not been able to diagnose the issue. Relays are good, continuity is good and the fan motors are good. When I get into traffic I know to switch over to the temp reading because if it goes a half bar above about 50% it will throw a check engine code. If I look at the fans they are usually stopped. They will sometimes kick on for a few weak revolutions and then stop again. I shut the bike down, wait a minute or so and restart. Sometimes the fans kick on, sometimes they don’t. Rinse & repeat. They never seem to kick into high mode. When the traffic clears, the temp goes back to normal, so I think the thermostat is fine. After a few cycles of no traffic the check engine fault goes off. Until next time…. Grrr…

So, after looking at the downloadable repair manual/coolant system I found that it has a PWM Controller. This regulates fan speed. Hmm… Computers use them and you may have heard your fan when it kicks into high mode. So, I ordered one this afternoon. Maybe that’s the issue or maybe not but I think I am on the right track. Thoughts? My issue now, don’t even go there is that I can’t find how the replace the PWM Controller in the searchable database. Remove the cowling? Remove the radiator? Help! Please.

I know it's an old thread. Here's my penny's worth. I was thinking of bypassing all this computer rubbish and fitting a manual switch for the fan. I've done it on other bikes and was happy with the results. This Rocket does not give any visual indication of the temperature. I've never heard any fan noise. I'm not even sure it works, tbh. Anyway, that's my bit off my chest, now back to booting the dog.

 

[Nashvegas]

Next screen to the right after fuel is temperature. Mine only kick on in heavy traffic, but I can hear them if I am stopped. Mine has been perfect since replacing that module.

 

[Steff]

Next screen to the right after fuel is temperature. Mine only kick on in heavy traffic, but I can hear them if I am stopped. Mine has been perfect since replacing that module.

Hu! On a Gen 1? I don't have screens

 

[TURBO200R4]

I know it's an old thread. Here's my penny's worth. I was thinking of bypassing all this computer rubbish and fitting a manual switch for the fan. I've done it on other bikes and was happy with the results. This Rocket does not give any visual indication of the temperature. I've never heard any fan noise. I'm not even sure it works, tbh. Anyway, that's my bit off my chest, now back to booting the dog.

a lot of years ago i was having some problems so i wired (the ground wire that goes to ecu that works good for testing or if it over heats) it to ground, but it will turn on check engine light and set a code if you use it.
you can remove code later.
hth