GL1100 Cooling fan thermal switch - Steve Saunders Goldwing Forums

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post #1 of 138 (permalink) Old 01-28-2008, 05:39 PM Thread Starter
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The thermal switch on my 81 gl1100 has been broken for some time.

I dropped a couple of wires down and hardwired a toggle switch across it.

$80 or $90 dollars for the replacement switch seemed a little excessive.

I read on the nakedwings board that a thermal switch out of a 94 Geo Metro 1.0L was the right thread and temp so I went to Advance auto parts and bought one for $16.95.

The switch did not have the protruding extension on the inside and had different connectors but it did have the correct threads and screwed right in.

I made some little connector wire adapters so I would not have tocut the original wiring harness and I wanted to keep the bypass switch.

The switch works like a champ and comes on when it should and shuts off when it should.







Peter



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post #2 of 138 (permalink) Old 01-28-2008, 05:47 PM
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Nice! I'm all for saving some cash.

Thanks for passing this on.

1983 GL1100 Interstate with 1200 engine, single carb, and C5 ignition.



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post #3 of 138 (permalink) Old 01-28-2008, 06:00 PM
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Great Tip!! Thanks, I'll probably pick one up this weekend cuz mine is bad too. DO you have a part number?

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post #4 of 138 (permalink) Old 01-28-2008, 06:12 PM
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Peterbylt wrote:
Quote:
The thermal switch on my 81 gl1100 has been broken for some time.

I dropped a couple of wires down and hardwired a toggle switch across it.

$80 or $90 dollars for the replacement switch seemed a little excessive.

I read on the nakedwings board that a thermal switch out of a 94 Geo Metro 1.0L was the right thread and temp so I went to Advance auto parts and bought one for $16.95.

The switch did not have the protruding extension on the inside and had different connectors but it did have the correct threads and screwed right in.

I made some little connector wire adapters so I would not have tocut the original wiring harness and I wanted to keep the bypass switch.

The switch works like a champ and comes on when it should and shuts off when it should.







Peter

just wondering ---anyone know if the thermo switch activets a relay on the geo? what im thinking is current draw though the thermo switch. interresting ? ?

1979 gl1000 dressed --back to naked
1980 gl1100 interstate --side lined
1983 gl1100 interstate the fastest color--RED
retired trucker---going to see it again ----on 2 wheels---love it--love it

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post #5 of 138 (permalink) Old 01-28-2008, 06:17 PM
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I would doubt it, the fan on the geo isn't going to draw any more than the GW fan, if as much. The Geo radiator is gonna be a good bit bigger than the GW raditator, so the fan on the Geo isn't going to have to work as hard.

It's a goo question though, and definitely worth knowing for sure.

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post #6 of 138 (permalink) Old 01-28-2008, 06:19 PM Thread Starter
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The part number is on the box in the first Picture.

75 GL1000
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post #7 of 138 (permalink) Old 01-28-2008, 06:22 PM
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Peterbylt wrote:
Quote:
The part number is on the box in the first Picture.

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post #8 of 138 (permalink) Old 01-29-2008, 12:04 AM
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94 Geo Metro 1.0L
BWD
TFS596
40-5079

Awesome news - knew there had to be something out there that wasn't so pricey!

Thank you for the tip.

Past bikes in no particular order -

65 Yamaha 80
67 Yamaha 305 Scrambler
71 & 75 HD Sportster
75 HD FLH
72 Suzuki T500
74 Suzuki GT550
77 Suzuki GS750
72 & 81 BMW R75/5, R100RT
83 Yamaha XT200

Current bike:

81 Honda GL1100
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post #9 of 138 (permalink) Old 01-29-2008, 06:51 AM
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Even though the Geo is a small car with a small fan, it could draw some serious amps on startup. We have modified several older vette cooling systems changing them to electric fans and used fans from Ford Taraus etc. They all had relays in the system. I would be willing to bet the Geo has a relay, just because it seems to be standard operation procedure these days with all car mfg. This isn't to say you need one in this application; current draw on the GW fan, especially on startup, would dictate wheter you really need a relay or not. Whenever we do a resto on any vehicle, the one mod we all do is use relays on all the electrical components. It is just a safe practice to make sure nothing is left to chance. If your GW doesn't have a relay now and isn't giving any problems it should be fine.

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post #10 of 138 (permalink) Old 01-29-2008, 08:45 AM
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i wish you would have posted that last week, i have just bought a brand new one from the local honda dealer, £71thats about $140, ah well, you live and learn

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