Bike running hot

Information and questions on GL1500 Goldwings (1988-2000)
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Joined: Thu Oct 09, 2014 11:42 pm
Location: Lakewood, California
Motorcycle: 1995 GL1500 Goldwing Aspencade

Bike running hot

Post by BearWing » Thu Oct 09, 2014 11:55 pm

My 1995 GL1500 Aspencade has been running hot and I can't seem to locate the problem.
I have replaced the water pump and thermostat, but still runs hot in stop and go traffic, seems to do fine on the freeway when cruising at a constant speed above 60mph. The fans seem to kick on way to late, long after the bike is already hot.
Looking for any suggestions to solve the problem


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Motorcycle: 1980 GL1100 Interstate (sold)
1990 GL1500 Aspencade (sold)
2005 GL1800

Re: Bike running hot

Post by 702scottc » Fri Oct 10, 2014 7:51 am

How high is the temp gauge showing when the fans kick on? Mine come on when the gauge shows half. Is is boiling over hot or just showing higher on the gauge?

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Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Bike running hot

Post by RBGERSON » Fri Oct 10, 2014 8:20 am

On 1100's there is a separate switch that reads water temp and turns the fans on..same on a 1500?? you haven't said you replaced or test that/ maybe #22 here ... veh=132035


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Re: Bike running hot

Post by WingAdmin » Fri Oct 10, 2014 9:45 am

It does sound like the coolant fan switch may be the issue. It's fairly easy to test - from the service manual:

Coolant fan switch
Coolant fan switch

Remove the fairing front cover.

Disconnect the BLK wire terminal from the thermostatic fan motor switch. Short the BLK wire to ground. Turn the ignition switch to ON. The fan motor should work.

Drain the coolant.

Remove the fan motor switch and a-ring from the left radiator.

Suspend the switch in a pan of coolant (50-50 mixture) and check the temperatures at which the switch opens and closes. Use an electric heating element to heat the coolant.

Make sure that there is no switch continuity at room temperature and gradually raise the coolant temperature.

The switch should have continuity (close) at 98-102° C (208-216° F).

• Keep the temperature steady for three minutes before testing continuity. A sudden change of temperature will cause an error in temperature readings between the thermometer and the switch.
• Do not let the thermometer or switch touch the pan as it will cause a false reading.
• Place the switch in coolant up to its threads. Install the thermostatic fan motor switch with a new o-ring and tighten it to the specified torque.

Torque: 28 N-m (2.8 kg-m, 20 ft-Ib)

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Re: Bike running hot

Post by Rob98801 » Fri Oct 10, 2014 10:19 am

On my 1500se I ran a jumper from one side of the Fan motor switch thru a switch to ground. This last summer on very hot days I could manually turn on the fans as soon as I got in traffic.

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