cooling fans never seem to come on

[halvander]

I have a 2015 trike mostly stock and when I bought it new the cooling fans seemed to run most of the time when I shut it off but recently the fans never seem to come on. We were riding in 90 degree weather and normally the fans would kick in but not now. I have tried them manualy and they do work what else could it be.

[FuzzyWuzHe]

I have a 2015 trike mostly stock and when I bought it new the cooling fans seemed to run most of the time when I shut it off but recently the fans never seem to come on. We were riding in 90 degree weather and normally the fans would kick in but not now. I have tried them manualy and they do work what else could it be.

Are you talking about the stock cooling fans or an after market. When you say tried them manually, what does that mean? I'm not aware of a way to turn the stock ones on manually. Did you check the fuse for the fans?

[MDO]

I would think that, like most cooling fans, they are thermostatically controlled. I would, after checking the fuse as Fuzzy suggests, jumper out the thermostat & see if they run & if they do, remove/replace the thermostat.

[Jack Klarich]

Try this to see if both fans come on

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Turn your bike on, don't start it, then roll the throttle half way and the pump and fans will come on. This feature lets you check everything works and helps get the air out if you ever have to drain and refill the system. Pump and fans run until you turn the ignition back off.

[headheaded]

When my trike was new they ran alot too. After breaking it in and installing vied's and killing the cat they hardly ever run anymore.

[FuzzyWuzHe]

When my trike was new they ran alot too. After breaking it in and installing vied's and killing the cat they hardly ever run anymore.

Yep ... since tuning, de catting. mighty mites, tank lift, air deflectors, mine haven't come on ... hmmm ... might have to try Jacks tip to see if they still work ... LOL. Good tip Jack.

[KJB]

Try this to see if both fans come on

---

Turn your bike on, don't start it, then roll the throttle half way and the pump and fans will come on. This feature lets you check everything works and helps get the air out if you ever have to drain and refill the system. Pump and fans run until you turn the ignition back off.

That's amazing. I just went out in the garage and gave this a try. Sure enough the fans came on. Thanks for sharing.

[ISP-FL]

Yes, thanks Jack, that is good info to know!

[Jack Klarich]

Maybe this could be a sticky?

[Mykneesbehurtin]

This is one of many reason this site is so great,the wealth of knowledge here is amazing.

[halvander]

Try this to see if both fans come on

---

Turn your bike on, don't start it, then roll the throttle half way and the pump and fans will come on. This feature lets you check everything works and helps get the air out if you ever have to drain and refill the system. Pump and fans run until you turn the ignition back off.

I have done this and both the pump and fans come on, another trike owner said it could be the pump going out as he has replaced 3 on his 2016

[FuzzyWuzHe]

Maybe this could be a sticky?

At least we should make a sticky to put some of these tricks in. The cruise control diagnostic was a good one too.

[MDO]

I have done this and both the pump and fans come on, another trike owner said it could be the pump going out as he has replaced 3 on his 2016

Did you check the thermostat? Doesn't it control the fans coming on?

[Jack Klarich]

Have you checked for any DTC? Is your trike running hot?

Is your coolant low?

[halvander]

Have you checked for any DTC? Is your trike running hot?

Is your coolant low?

coolant is right up there and its doesn't seem to running hot, not sure how to check the thermostat

[Jack Klarich]

Has your coolant light or engine light come on and stayed on?

Have you checked for stored codes?

Harley claims few issues with their thermostats, saying more often the pump goes bad

[MDO]

Has your coolant light or engine light come on and stayed on?

Have you checked for stored codes?

Harley claims few issues with their thermostats, saying more often the pump goes bad

Jack, doesn't the thermostat control the fan coming on? Please correct me if I'm wrong.

[Jack Klarich]

Jack, doesn't the thermostat control the fan coming on? Please correct me if I'm wrong.

I am not sure how it works with the engine coolant temp sensor, I have not had the displeasure of working on one of these systems

I would think if one was having problems with one of these there should be a trouble code and or an engine light on

[bassmanmb5]

I have the same bike, same trouble. Works fine when manually turned on.

[woody]

Pump, if the pump has not been changed out it is probably the pump. Put your hand on the pump and do the throttle trick to see if it starts. Mine would run sometimes and other times it would not. The Magnetic coupling was

Cracked and sticking or binding.