Fans come on but temperature doesnít drop - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 13 (permalink) Old 08-11-2020, 06:16 PM Thread Starter
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Fans come on but temperature doesnít drop

I recently did a valve clearance check. I had to drain a bit of coolant. I refilled the radiator. Overflow bottle is also full. Iíve been riding it but not monitoring the temperature. My fans were coming on so I assumed all is well. Today, when i got home the fans were running. I checked the temperature and it was still ~220 and not dropping. Is this air in the tube inside the valve cover? If the fans are on, is the coolant circulating? Bike is a 2013.

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Ray

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post #2 of 13 (permalink) Old 08-11-2020, 07:06 PM
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Could be normal depending, but there's only one thing to do..... when cold, remove the rad cap and top it off in case it had a little too much air and didn't suck back enough from the reservoir bottle. It does take a couple of cooldown cycles to stabilize the reservoir level.
The coolant will be circulating, no worries there... if ambient air temp is high, will take longer for the fans to shut off, but as you approach home at speeds of less than 30 mph, low air flow through rads, fans will come on.
Just top off the rad and give it another cooling cycle.
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post #3 of 13 (permalink) Old 08-11-2020, 07:44 PM Thread Starter
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Thanks, damage is my main concern as I have ridden a couple hundred miles since the valve check.

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post #4 of 13 (permalink) Old 08-11-2020, 07:48 PM
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If fans are running and it will not pull temp down, at least slowly, something is wrong.
Rad full of bugs, Air not completely bled , thermostat problem, low coolant.
In Canuck , fans on at 105C off at 99C.


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post #5 of 13 (permalink) Old 08-11-2020, 08:19 PM Thread Starter
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Tomorrow morning I open the radiator cap and make sure it's full. When I did such things on cars, I would run the engine with the cap off and wait for the fans to suck it down. Is this reasonable?

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post #6 of 13 (permalink) Old 08-11-2020, 08:37 PM
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the temp sensor on the fjr likes it when the system is full. I waited for a couple others to answer because I have a gen2 which reads out in "bars" not digits. My bike was showing 10 bars (HOT) when stuck in traffic the first time (when I bought it used).....fans were on. It scared me so I got out of traffic and all was fine, bars went down. Even with bars full, the bike never puked any fluid. Went home and added only a few ounces of coolant, and never had the bars go over 7 since. When in traffic it will sit at 7 though, even with fan on. Hope that helps.
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post #7 of 13 (permalink) Old 08-11-2020, 08:41 PM
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Tomorrow morning I open the radiator cap and make sure it's full. When I did such things on cars, I would run the engine with the cap off and wait for the fans to suck it down. Is this reasonable?
Probably not needed and could cause a mess. I just did this and after topping off and filling reservoir to the max line I have had to add just a little a couple times over the next few rides.

No individual loss was enough to bring me down to the minimum line and now it is stable. No worries if it burps a little out the overflow during that time frame either.

It may not hurt to clean your radiator the next time you have your lowers off. I spray it down with something like Simple Green or a spray degreaser, insert a dry rag behind the radiator, and blow some compressed air until it's clean. A light behind the radiator will make it easy to see the clogged portions.

I was shocked at how dirty mine was!

I'm a Gen 2 as well. Moving it will be 3 feathers. Slow and city it will be 7 feathers. 8 feathers sometimes when I pull it into my shop and park it, but it always cools down.
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Last edited by Dale I; 08-11-2020 at 08:43 PM.
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post #8 of 13 (permalink) Old 08-11-2020, 09:21 PM
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Quote:
Originally Posted by RaYzerman View Post
when cold, remove the rad cap and top it off in case it had a little too much air and didn't suck back enough from the reservoir bottle..

Once topped off, I've always rocked/tilted the bike left and right which usually gets a few more bubbles to the rad's filler neck... and then top off again and repeat as needed.... this hasn't failed me yet!
Get some help as these are HEAVY beasts as you know!
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post #9 of 13 (permalink) Old 08-11-2020, 10:50 PM
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Mr. BR, next time just squeeze the lower rad and water pump hoses.

Ray
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post #10 of 13 (permalink) Old 08-12-2020, 07:23 AM
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With coolant work, I always refill the overflow to about 1" above the full mark. Sometimes it takes 2 or 3 rides but it always burps itself down to just below the full mark. It also helps if you lean the bike against a wall or something on the right side and fill the radiator extremely slowly.
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