• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

511 Rad Fan - engine seems to run HOT

S

Suputin

Husqvarna
AA Class
The fan on my 511 doesn't ever seem to come on, even when the motor is pretty hot. Just how hot does this thing need to get before the fan starts? Is there a way I can check to make sure the fan is working properly?
 
Could be either your sensor or your relay. Should be able to let it set and idle for five minutes, should come on.
 
The sensor is like 12 bucks I think, not sure how much for the relay. Should be able to check it with a VOM. I have heard of both going out.
 
The sensor was easy to find as it is threaded into the bottom of the RH rad. The relay location? ... no idea on that one.

I unplugged the fan and tried putting power to it with wires direct from the battery and .... nothing. Now that isn't 100% conclusive cause I am not positive I had a complete circuit.

However I tried spinning the fan blades by giving them a tap with a screw driver and they don't spin very freely. With the hardest shove I can impart to the fan blades they only spin about 1/4 to 1/3 of a turn. I thought they would spin much more freely.
 
Here's an older, 18000 miles TE fan, still working, just so you can see how free it turns, plus I switched it on since I have it powered separate from the temp sensor. The faded markings on the fan blades are silver sharpie marks I put on there so I could try and see when the fan was turning.

 
OlderHuskyRider said:
Here's an older, 18000 miles TE fan, still working, just so you can see how free it turns, plus I switched it on since I have it powered separate from the temp sensor. The faded markings on the fan blades are silver sharpie marks I put on there so I could try and see when the fan was turning.

Click to expand...


Mine is pretty similar to that. How did you wire the fan up separate from the sensor?
 
I checked mine with a temperature gun when I first picked up my bike, I believe the fan comes on around 185 degrees and stays on until the coolant temp is 170. If you are doing any sort of low speed riding, or if the bike idles more than 5-minutes the fan should turn on if the ambient temp is above 70 degrees. I rode some very tight woods trails last weekend, the fan on my bike as well as my buddies G450X were both on a lot.
 
Suputin said:
Suggestions for working out where the problem is?
Click to expand...


If the fan is stiff to turn, likely it is on the way out.
Try to get a good connection on the pins like you tried before, it should run if you do, if not it's probably dead.
It might be possible to open it up & clean inside it, but could damage it trying.

For the sensor, pull the sensor out, connect a multi-meter to the pins & drop the tip in near boiling water & make sure the readings change.

Easiest test for the fan relay would be to swap it for one of the others & see if the bike still runs.
The fan relay is behind the rh radiator near the cyl. head, swap it for either of the ones on the left side of the engine, they are the fuel pump & main relays.
If it still runs, the relay is ok.
 
Well ....... it seems the internets is really a good thing. All this talk reminded me to check the coolant. Which was pretty low, at least 100 mls. In the process of filling it up I decided seeing as I was there already it would be worthwhile replacing the coolant. Good thing too cause what came out was nasty. :(

It took a couple of flushings before clear water ran out the drain plug. Then I emptied it and poured in fresh coolant.

Still gotta figure out if the fan is working but at least the motor isn't full of crap anymore. ;)
 
Yeah, my bike was old stock when I bought it ('11 model bought in '12)
The original fill coolant was dead already when I got it home from all the sitting around :(
 
Suputin said:
Mine is pretty similar to that. How did you wire the fan up separate from the sensor?
Click to expand...


I ran the original wires that power the fan to a light on my dash, so that I know when "fan on" temp has been reached.
For the fan, I found the switched power line in the cowling, and ran that line to a switch on the handlebars and then the switched power down to the fan. I wanted the fan to run with the motor off and the key on, but not run when the key is switched off.
 
Easiest test for the fan relay would be to swap it for one of the others & see if the bike still runs.

A friend helped me out and we quicky wired up the fan and it works fine. So the next thing to check will be the relay. I will leave the temp switch to the end cause it requires draining the rads to remove it.
Click to expand...
 
"I will leave the temp switch to the end cause it requires draining the rads to remove it."


Why remove the temp sensor to test? Just start with the bike cold and watch the test meter as the bike warms up.
 
An electrician friend came by and we screwed with the system and bit and determined that the fan itself works fine. The next easiest thing to test was the relay so I swapped the headlight relay with the fan relay and voila ..... the fan came on as soon as the engine got hot. Yay!

The weird thing is the headlight, which now has the "faulty" fan relay seems to work fine. Go figure. Anyway, the problem seems to be solved. I am thinking I will build a custom reservoir tank for the rad overflow so that any overflow can be pulled back into the rads rather than simply get dumped on the ground.
 
You must log in or register to reply here.
Back
Top