1989 GL1500 Aspencade cooling fans not coming on when hot


Information and questions on GL1500 Goldwings (1988-2000)
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Kas413
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Motorcycle: 1989 GL1500 Honda Goldwing Aspencade

1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Kas413 » Sun May 20, 2018 12:47 am



I have a 1989 GL1500 and the cooling fans will not turn on and I don't hear them when I stop after riding.

Is there a fuse I should replace?

Is there a relay or sensor I should replace?

If the relay or sensor, is it the one on the underside of the left radiator?

What is the easiest way to fix this problem?

Please help. This site has always provided me with awesome information in the past that has always worked....

Thank you,
Ken



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Aussie81Interstate
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Aussie81Interstate » Sun May 20, 2018 12:56 am

Ground the fans directly, that will confirm they are not burnt out.

Then the thermostatic switch can be tested - between the two you will find your answer.

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Erdeniz Umman
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Erdeniz Umman » Sun May 20, 2018 3:40 am

Also make sure that the coolant level is ok, and the radiators are hot before deciding on the problem. If the radiators are cold (due to stuck thermostat, insufficient coolant etc.) the fans will not work.

And what do you read on the temp gauge at max?

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dingdong
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by dingdong » Sun May 20, 2018 8:04 am

Define hot and why you think the fans should be on... My 1500 never gets hot enough to turn on the fans unless in extended stop and go traffic or idling for a long period of time.
Tom

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Kas413
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Motorcycle: 1989 GL1500 Honda Goldwing Aspencade

Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Kas413 » Sun May 20, 2018 11:00 am

Thank you all for your suggestions. As for why I believe the fans should be on, last year before I had my carbs rebuilt and a small coolant leak fixed (while carbs out) the fans would work and stay on after I hit the kill switch but left the key "on". The fans stopped working shortly before I had these repairs made. As for the coolant level, it is at the top of the dip stick marks where it should be, so the level is correct.

As for my temp gauge, at operating temp when the ambient temp is between 70 - 90 degrees F, the meter is usually in the middle between the bottom (left) cold block on the gauge & straight up middle, which I suspect is between 180 - 200 degrees +/-..

As for grounding the fans, I have not pulled any wires yet, what is the best way to ground the fans to turn them on (if they are working) that would not effect any of the electronics in the rest of the system?

Thank you,
Ken

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Erdeniz Umman
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Erdeniz Umman » Sun May 20, 2018 12:45 pm

There are 3 temp sensors on the bike at different locations.
1.Thermostatic sensor on the left radiator for the fans
2.ECT sensor on the right intake manifold for ECU
3.Temp sensor on the thermostat housing for Temp gauge.

So can you confirm that the radiators are getting hot while the temp gauge is reading hot?

On my 2000 model bike the fans start working over the midrange on the temp.gauge and it continues a few seconds more after stopping the engine.

The test procedure given in the service manual is as follows.
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Mh434
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Mh434 » Sun May 20, 2018 2:25 pm

Assuming the coolant level is okay, the temp sensor at the radiator is the most likely culprit, IMHO. It works by completing a ground to the circuit when the temperature gets high enough, so (with the ignition turned on), providing a path to ground for the sensor will confirm the issue. If the fans come on at that point, the sensor is the problem.

I've replaced several of these on my various liquid-cooled bikes (and those in a few cars, too), and the symptoms are always exactly as you've described. They are, it seems, a common failure point but, thankfully, a fairly cheap one to fix.

Kas413
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Kas413 » Sun May 27, 2018 6:32 pm

Thank you all for your input and suggestions. Erdeniz Umman, thank you for the diagram, it helped a lot.

I grounded the fan wire and the fans turned on immediately, so the fan motor switch is the culprit.

Does anyone have detailed instructions on how to drain the left radiator so I can replace the fan motor switch?

Thank you all again for helping me solve this problem, I appreciate everyone's input and suggestions...

Ken

Kas413
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Kas413 » Sun May 27, 2018 6:38 pm

I think I found the link to draining the radiator at: viewtopic.php?t=31083

Is this the correct link?

Ken

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Erdeniz Umman
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Erdeniz Umman » Mon May 28, 2018 1:52 am

This is the related page in the service manual to drain the coolant.
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Kas413
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Kas413 » Mon May 28, 2018 8:50 pm

Erdeniz, it looks like what you provided is similar to the link I found, but from the manual. It appears both are pretty similar, would you agree?

Is it important / critical to replace the plug sealing washer? I was not planning on doing so based on the information from the other link, and I already ordered a new sensor from Wingstuff.com.

Thank you,
Ken

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Erdeniz Umman
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Erdeniz Umman » Tue May 29, 2018 4:04 am

I would replace that copper washer, because if it wasn't replaced before, it may be unusable and as you tighten the bolt you may damage the water pump case which will require a lot of work to fix it.

You can find it locally or from a Honda dealer if you have the old one with you.

The "how to" link is quite explanatory, and could be used together with the service manual procedure.

Kas413
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Re: 1989 GL1500 Aspencade cooling fans not coming on when hot

Post by Kas413 » Wed May 30, 2018 10:02 am

Erdeniz, thank you for your input, I appreciate it very much...

Ken



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