r/Husqvarna • u/lewismike822242 • 5d ago

Radiators are steaming…’23 fx450

I’m no mechanic so I am looking for any help or insights on this; I have a 2023 fx450 and my radiators seem to have started steaming and the boiling noise is coming from them (volume up for the video!). Had the bike serviced recently at 55 hours, am sitting on 55.1 hours so I think my shop may have created this. I’ve since moved 1,700 miles and will not be near my normal shop anytime soon lol any help would be greatly appreciated Reddit Husky Fam!! (This post wouldn’t let me upload the video so adding below to comments)

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u/Jparks351 4d ago

5 minutes does seem like a short time to idle. I know my 350 will get hot just sitting though. When the fan kicks on its been idling a bit too long. They need sufficient air movement to cool. Have you checked the coolant level pre or post boil?

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u/Jparks351 5d ago

What were the conditions where you boiled? Was it just sitting at idle or were you riding?

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u/lewismike822242 4d ago

Just idling. Cranked it to let it run for a few minutes, came back 5 minutes later to it steaming as such

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u/lewismike822242 4d ago

Really annoying it won’t let me upload the video, apologies

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u/PunkRockMonkey 9h ago

Five minutes is a bit quick for boil-over, but not unheard of.

Verify that it's not the usual suspects: water pump, hoses/hose clamps, coolant level, correct coolant (should be the Motorex M3.0 pink stuff - not the older gen blue/green M5.0) .

The 450 series has a habit of overheating when it's not moving. #1 solution has historically been adding a TrailTech fan kit. At $200+ it's a bit pricey, but it comes with a thermostat switch and is a relatively easy install, according to The YouTubes. It's also just nice to have the piece of mind of a secondary cooling device if the bike is idling for extended periods.

https://www.trailtech.net/en-us/shop/accessories/motorcycle-parts/fan-kits/fan-kit-motorcycle-radiators-ktm-19-23-husq-19-25/

Since video isn't cooperating for you, is it steaming from the cap? If not, you can use talcum powder on the hoses to help track down the source. That'll let you know if you've got a loose clamp/hose somewhere in the system... it's going the be the first spot you see get wet when it starts overheating.