Help, please! Engine overheating 🥵

Air in the pump would be the only way it could be air bound. Water not circulating has two possibilities, one the pump isn't pumping, two the thermostat is failed shut. Another possibility is the pump impellor imploded and the debris is restricting flow. I had that happen on an outboard motor once and it was hell finding the problem (new water pump didn't solve the overheating).
 
Yeah, I'm leaning away from the PWM Controller. The code indicated the Coolant Temperature Sensor, but wondering if that just means it did its job indicating a problem, or if the sensor itself is bad.

My hunch though goes back to air in the system. Wondering if the overflow tank were too low, then I topped it off while cold, then took the bike for a ride, if in the process of drawing fluid from the overflow tank if air might not have been introduced- maybe by the empty hose drawing on the newly available fluid. Also, the radiator cap was not hot, so it suggests water wasn't circulating. I was moving at about 40 mph when this happened.

This all began immediately after I added coolant to the overflow tank. Of course there are always coincidences in the timing of things.

After towing the bike home and reading the code I did open the radiator cap and let it idle a while and it was fine. I'm going to take the bike out now after a long idle and see what happens next.


 
Did it gurgle or burp when you had the cap off idling? Did the water get pretty warm? I hope it was just air.
 
I found the alternate, but this will require punching/crimping of connectors (which is not that hard) , this module is only $60USD and twice as powerful/capable compare to triumph OEM $260 USD

Amazon.com: uxcell 1 Set No.8E0959501AG/8E0959501AB/8E0959501K Radiator Engine Cooling Fan Control Unit Module Controller for Audi A4 1.8L 3.0L 2002-2005 : Automotive

Buy uxcell 1 Set No.8E0959501AG/8E0959501AB/8E0959501K Radiator Engine Cooling Fan Control Unit Module Controller for Audi A4 1.8L 3.0L 2002-2005: Electric Controls - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
 
Nice find!
 
Nashvegas said:
Did it gurgle or burp when you had the cap off idling? Did the water get pretty warm? I hope it was just air.
Click to expand...
No, nothing dramatic like that. Maybe once it cooled down and bounced around on the trailer it burped like patting a baby on its back.

Earlier, I let it idle till the fans kicked on, and more, and it stayed in range. Just got back from about a 20 mile ride and also kept in range. I'm going with and hoping for my idea that it sucked in air when it drew from the overflow tank, but for all I know that might be physically impossible.

Speaking of sucking... now, I'm going to be paranoid that I'll get stuck far from home if this comes up again. I'll do a few more local rides and then go for it with the temperature monitor always on display. Wish me well...

If something new happens I'll definitely post back
 
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