GL1000 Cooling System


Information and questions on GL1000 Goldwings (1975-1979)
  • Sponsored Links
danielklinger
Posts: 13
Joined: Sun May 17, 2015 4:04 pm
Location: United States
Motorcycle: 1977 GL1000 Goldwing

GL1000 Cooling System

Postby danielklinger » Tue Aug 18, 2015 8:22 pm



I own a 1977 Gl1000. When I got my bike the factory temperature gauge didn't work. Someone along the way added a separate generic temp gauge. It too didn't work. So I bought a generic temp gauge and installed it. I ordered a new temp sensor from Honda to replace the old one. My question is should the temp sensor and the gauge match? The new gauge I installed works fine. But the gauge says my GL1000 is running at about 280 degrees and the temp switch that runs the fan still hasn't kicked on. It should run on about 220-225 degrees. What do you think? Thanks for your feedback. I'll wait to hear back from you.



User avatar
702scottc
Posts: 252
Joined: Tue May 15, 2012 12:12 am
Location: Las Vegas, Nevada
Motorcycle: 1980 GL1100 Interstate (sold)
1990 GL1500 Aspencade (sold)
2005 GL1800

Re: GL1000 Cooling System

Postby 702scottc » Wed Aug 19, 2015 10:12 pm

You need the sending unit that is calibrated to the gauge you installed. That should fix it. If memory serves, the GL1000's in the 1970's had a mechanical engine driven fan? Could be wrong but my friend had a 1977 and the fan was driven off the engine.

User avatar
virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1000 Cooling System

Postby virgilmobile » Thu Aug 20, 2015 11:02 am

The temp sensor that operated the gauge is not generic.
You will need one that matches the OEM specs.The gauges are supplied voltage by a 7 volt regulator for stability and accuracy.Same for the fuel gauge.The service manual shows specific tests for each one.
Also,the water pump is engine driven,the radiator cooling fan is electric..Its operated by a thermal switch near the thermostat housing.It has 2 terminals.The temp sensor has one terminal.
If I remember correctly,my 1000 would run in the 180-200* range all day then kick on the fan around 205* when idling.

SnoBrdr
Posts: 328
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: GL1000 Cooling System

Postby SnoBrdr » Thu Aug 20, 2015 11:09 am

virgilmobile wrote:The temp sensor that operated the gauge is not generic.
You will need one that matches the OEM specs.The gauges are supplied voltage by a 7 volt regulator for stability and accuracy.Same for the fuel gauge.The service manual shows specific tests for each one.
Also,the water pump is engine driven,the radiator cooling fan is electric..Its operated by a thermal switch near the thermostat housing.It has 2 terminals.The temp sensor has one terminal.
If I remember correctly,my 1000 would run in the 180-200* range all day then kick on the fan around 205* when idling.


Isn't the fan switch and temp sensor the same thing?

User avatar
virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: GL1000 Cooling System

Postby virgilmobile » Thu Aug 20, 2015 11:44 am

No.the fan switch is a thermal on/off switch.When it reaches its temp rating,the contacts close to ground the fan circuit.
The temp sensor is a variable resistance device.as the temp changes so does its resistance to ground.As it gets warmer,the resistance drops..raising the temp gauge.The gauge is powered by the regulator,the sensor is the ground path.
Similar circuit as the fan.

SnoBrdr
Posts: 328
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: GL1000 Cooling System

Postby SnoBrdr » Thu Aug 20, 2015 3:03 pm

virgilmobile wrote:No.the fan switch is a thermal on/off switch.When it reaches its temp rating,the contacts close to ground the fan circuit.
The temp sensor is a variable resistance device.as the temp changes so does its resistance to ground.As it gets warmer,the resistance drops..raising the temp gauge.The gauge is powered by the regulator,the sensor is the ground path.
Similar circuit as the fan.


Ah, if someone had said the sending unit sensor I would have known.

I've never had the occasion to deal with that switch as it has noting to do with the actual operation of the fan.

I found one in my box of small parts the other day and wondered what it was, now I know.

danielklinger
Posts: 13
Joined: Sun May 17, 2015 4:04 pm
Location: United States
Motorcycle: 1977 GL1000 Goldwing

Re: GL1000 Cooling System

Postby danielklinger » Sun Aug 23, 2015 5:55 pm

Thank you for everyone who responded to my post. It was all helpful. I am a new Goldwing GL1000 owner. So I'm just figuring out how the motorcycle operates and how to work on it. I ended up getting the sensor that matches the temp gauge. All I have to do now is get an adaptor that goes from a 16mm 1.50 thread to a 3/8 NPT. I found it on line. I think it will work perfect. After I get it all together I hope it all works well. Thanks again for all of you who took the time to respond. I greatly appreciate it. I'm learning a lot through this process. Thankful, Dan




Return to “GL1000 Information & Questions”




Who is online

Users browsing this forum: No registered users and 2 guests