Reversing Fans (Requesting Info)


Information and questions on GL1800 Goldwings (2001-Present)
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fmcastro
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Motorcycle: 2002 GL1800

Reversing Fans (Requesting Info)

Postby fmcastro » Sun Nov 06, 2011 8:26 pm



I ride a 2002 GL 1800. I live in South Florida. My fans run when I am riding in town 35 MPH & below for a short time and then shut off. When the fans run, the airflow is reversed to the normal direction. The hot air comes out the front of the engine instead of out of the radiators and to the sides of the bike. Is there an option to reversing the fan air flow? It would seem that at a speed of about 10 to 15 MPH the ram air would fight the fan's effort and heat up the engine. Any comments?



Red Ron
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Re: Reversing Fans (Requesting Info)

Postby Red Ron » Mon Nov 07, 2011 9:59 am

There used to be a lot of talk about it on other boards but I think (and I am not entirely sure) that the concenus is now to not do it but I can't remember why. Sorry I guess I just confused you.

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FlyBoy2121
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Gl 1800 2003

Re: Reversing Fans (Requesting Info)

Postby FlyBoy2121 » Mon Nov 07, 2011 12:23 pm

I fmcastro

You have a more radical solution, will see this address.Reverse the two fan

FlyBoy2121

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FlyBoy2121
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Gl 1800 2003

Re: Reversing Fans (Requesting Info)

Postby FlyBoy2121 » Mon Nov 07, 2011 4:47 pm

Excuse me, I forget address.


http://goldwing.eurekaboy.com/fanreversal.htm


FlyBoy2121 :oops:

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druidcat1115
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Motorcycle: 1999 Valkyrie Interstate
2006 GL 1800
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Re: Reversing Fans (Requesting Info)

Postby druidcat1115 » Mon Nov 07, 2011 5:31 pm

The GL 1800 is set up so it shuts the fans down at 15 mph regardless of engine temp. When running the fans run against the ram air flow and suck air in the side grills and push it out the front. At various points Honda made improvments in the cooling system so that this works and actually works well. But some of the older 1800's will suffer in hot weather and slow traffic. If you have one of those, one fix is this wire harness and switch set.
http://www.khwireharness.com/. With this kit you get full control of the fans. I ride 2008 and have no need for this even in New Orleans hot long summers. But if I had trouble with one overheating in traffic or the mountains this would be the way I would go.

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jimmy53
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Re: Reversing Fans (Requesting Info)

Postby jimmy53 » Mon Nov 07, 2011 9:38 pm

i would think reversing the fans would pull hot air to the radiators from the engine heat keeping the system orginal pulls cool air inward from the outside of the bike could be wrong but just makes sence what honda did.

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mbuesing
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1991 Yamaha Venture Royal 1300
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197? Yamaha 90 Enduro
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Re: Reversing Fans (Requesting Info)

Postby mbuesing » Mon Nov 07, 2011 11:18 pm

If reversing you are pulling hot air from the engine and also losing the self cleaning benefits of changing the airflow.
The GL1800 is a crotch rocket on Steroids.

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druidcat1115
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Re: Reversing Fans (Requesting Info)

Postby druidcat1115 » Tue Nov 08, 2011 10:04 am

mbuesing wrote:If reversing you are pulling hot air from the engine and also losing the self cleaning benefits of changing the airflow.

What?

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eddard49
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Location: Helena, Mt.
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Re: Reversing Fans (Requesting Info)

Postby eddard49 » Tue Nov 08, 2011 12:38 pm

druidcat1115 wrote:
mbuesing wrote:If reversing you are pulling hot air from the engine and also losing the self cleaning benefits of changing the airflow.

What?


I understand what he's saying. My fans seldom run, but when they do, I can see bugs being blown forwards out of the radiators.

Normal flow is front to rear (through the radiators). When the fans come on, flow is rear to front.....and any bugs on the radiators are ejected.

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druidcat1115
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2006 GL 1800
2008 GL 1800 Level 3
2008 GL 1800 Airbag

Re: Reversing Fans (Requesting Info)

Postby druidcat1115 » Tue Nov 08, 2011 5:25 pm

eddard49 wrote:
druidcat1115 wrote:
mbuesing wrote:If reversing you are pulling hot air from the engine and also losing the self cleaning benefits of changing the airflow.

What?


I understand what he's saying. My fans seldom run, but when they do, I can see bugs being blown forwards out of the radiators.

Normal flow is front to rear (through the radiators). When the fans come on, flow is rear to front.....and any bugs on the radiators are ejected.

I am with you my fans seldom run but then I have a 2008 and it is not a year that has this type of overheat problem. My radiators as are yours are both mounted above, forward and to either side of the engine and draw air from either the front(fan off) or the side (fan on) none of it is hot air from the engine. The only useful benifit of reversing the fan would be if you had a older model wing that overheats in traffic or slow running then you can prolong the fan running time to assist in engine cooling. That is reversing the fan and being able to control it will stop the ecu from turning it off at 15 mph and running it reversed stops it from having to fight the ram air effect and assist the air flow. With the kit cited above in this thread you have full control of the fan and can still return it to ecu control.

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mbuesing
Posts: 81
Joined: Sat Feb 26, 2011 8:19 pm
Location: Mankato, MN
Motorcycle: 2004 GL1800
Past rides.
1991 Yamaha Venture Royal 1300
1979 Kawasaki SR 650
198? Yamaha 175 Enduro
1976 Kawasaki KZ 400 (my son still rides this bike)
197? Yamaha 90 Enduro
1965 Honda S65 Sport
Minnie bike

Re: Reversing Fans (Requesting Info)

Postby mbuesing » Wed Nov 09, 2011 12:03 am

Being stuck in stop and go traffic you will see that there is a lot of radiated heat from the engine. Sucking air in from the side of the bike will cool it faster. As it begins to move a high pressure area is created to push air out from the center of the bike and a vacuum from the side to draw air out. :geek:
The GL1800 is a crotch rocket on Steroids.

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Ghostman
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Re: Reversing Fans (Requesting Info)

Postby Ghostman » Wed Nov 09, 2011 10:56 am

If the temp guage is climbing,its not overheating. Until it goes into the red and starts spewing coolant -then its overheating. Being a 2002 when was the last time the coolant was flushed and new coolant put in. Unfortunately the 1800 has the fans this way because of all of the complaints from the 1200 and 1500 owners. The major complaint was about the heat pouring out of the radiators and onto the operators legs. So Honda reversed the direction of the fans. Mine runs always under the halfway mark on the guage. Ive seen it climb to 3/4 of the guage stuck in bumper to bumper traffic in 109 degee weather in Las Vegas in July. Going up Beartooth pass in July it did the same thing. Being a 2002 yours has the smaller radiators. I would be concerned to see if it had the recall for over heating done to it at all.

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eddard49
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Re: Reversing Fans (Requesting Info)

Postby eddard49 » Wed Nov 09, 2011 11:34 am

The 2006 and newer Wings are not immune to this engineering fault. My 2007 temperature will begin to climb when ridden at 20 to 25 MPH for enough distance.




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