Removing thermoswitch and thermostat


Information and questions on GL1100 Goldwings (1980-1983)
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vaughn
Posts: 101
Joined: Sat Jun 16, 2012 8:28 pm
Location: Parker, Pa
Motorcycle: 1983 Gl 1100 Aspencade

Removing thermoswitch and thermostat

Post by vaughn »



How do you remove the thermoswitch from the housing and can I run a lower temperature thermostat than the 180.
My 83 Aspencade tends to run on the hot side. I have the radiator, thermostat and water pump flange off of bike. The fan was not coming on when it is supposed to. It's only 35 years old . Probably original switch. Have owned it for 7 years and it had 18000 miles when I bought it. Now has almost 50000


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AZgl1800
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Re: Removing thermoswitch and thermostat

Post by AZgl1800 »

do not change the thermostat to a different setting.
that will not be healthy for the engine.

if the fan is not coming on, and you think the engine is hot, check out the power to the fan, and check to see that the thermo sensor is working.

short the two wires at the temp sensor and the fan should run.
~John

2009 Piaggio MP3 250cc

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jeffcosmo
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Location: Burlington, WI (Honey Lake)
Motorcycle: 1983 GL1100 Aspencade
1983 GL1100 Aspencade
1983 GL1100 Aspencade (parts bike)

Re: Removing thermoswitch and thermostat

Post by jeffcosmo »

When you say the bike runs hot, how are you measuring the heat?? Electric temperature gauges (as stock) cannot be relied upon for such information. Laser temp probes are better, while mechanical gauges are perhaps best.

Too, what is "hot" to you?? Engines should run between 190º and 210º in general. Many people think that lower is better, yet that is simply not true. If the coolant is puddling underfoot after shutdown, the engine may be running hotter than it should. The radiator may also be partially plugged. If there is no coolant on the ground, you have no real worries.

Cosmo
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vaughn
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Motorcycle: 1983 Gl 1100 Aspencade

Re: Removing thermoswitch and thermostat

Post by vaughn »

As I have the bike apart I will be putting in a new thermostat. The stock rating.
Can I get O rings and thermoswitch at Napa or should I go to Honda dealer?
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redbug
Posts: 546
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Location: Broken Arrow,Ok
Motorcycle: 1983 Gl1100I
1986 Harley FLHT

Re: Removing thermoswitch and thermostat

Post by redbug »

Oem on the thermostat for sure, now as the rest, yes I would go oem. Fits the first time every time.
" Riding on Tulsa Time "
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vaughn
Posts: 101
Joined: Sat Jun 16, 2012 8:28 pm
Location: Parker, Pa
Motorcycle: 1983 Gl 1100 Aspencade

Re: Removing thermoswitch and thermostat

Post by vaughn »

I have the bike back together but the fan is not coming on. There is a white dot on the thermoswitch and it is facing back toward the engine. I put the plug on and the black wire is on the top terminal. There is no color coding on the terminals. Do I need to reverse the plug?
Thanks
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Wilcoy02
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Motorcycle: 1983 GL1100 I purchased 3/16

1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


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Re: Removing thermoswitch and thermostat

Post by Wilcoy02 »

Did the fan come on when you shorted the wires?`
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vaughn
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Location: Parker, Pa
Motorcycle: 1983 Gl 1100 Aspencade

Re: Removing thermoswitch and thermostat

Post by vaughn »

Yes. And it is a new switch from Honda as well as the thermostat.
I am rotating the plug around to see if that works. Honda didn't give enough room or wire for my big American hands. Don't want to loosen radiator again just for that. They need to mark those things. My GM vehicles only plug in one way, no way to mess It up
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vaughn
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Motorcycle: 1983 Gl 1100 Aspencade

Re: Removing thermoswitch and thermostat

Post by vaughn »

Got it. It is now working. Now to waxing, new brake fluid and new front tire and I will be ready for the road.
Wingman40
Posts: 19
Joined: Sun Apr 01, 2018 7:49 pm
Location: Pink Hill,NC
Motorcycle: 1980 Honda Goldwing GL1100

Re: Removing thermoswitch and thermostat

Post by Wingman40 »

Well looks like my thermostat may be stuck, started it up and was letting her warm up and heard bubbling so quickly turned it off and noticed antifreeze coming out the overflow tube. Anyone have a video on replacement for around a 1980 gl1100 by chance? I'll keep searching too and thanks in advance!!!
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DenverWinger
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'72 CL350 (1980-1988) sold
'78 Suzuki GS550 (1985-2005) sold
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Re: Removing thermoswitch and thermostat

Post by DenverWinger »

Did you happen to notice the temperature gauge? Even with a thermostat stuck shut it will take a good while of "Letting her warm up" before you'd get hot enough to overflow coolant.

Check radiator, (not overflow tank) and be sure it's full, then try again. Watch temperature gauge, If thermostat is stuck the temperature will continue past half scale toward "H", it should be clearly to "H" before any coolant flows to reserve tank though.

If you have coolant going to reserve tank and temp gauge only mid-scale, either the radiator cap is bad and not holding pressure like it should, or this is a possible sign of a blown head gasket.
There are 10 types of people in the world, those that understand binary numbers, and those that don't. :lol:

♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:
~Mark
Wingman40
Posts: 19
Joined: Sun Apr 01, 2018 7:49 pm
Location: Pink Hill,NC
Motorcycle: 1980 Honda Goldwing GL1100

Re: Removing thermoswitch and thermostat

Post by Wingman40 »

When I noticed it boiling I barely glanced at it but don't think it was too the hot side. Looked like normally if I remember correctly. Gonna double check fluids and check again tomorrow. Thanks for the input, I really appreciate it...
joecoolsuncle
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Location: oxford, ar
Motorcycle: 1984 gl1200a

Re: Removing thermoswitch and thermostat

Post by joecoolsuncle »

when i bought my bike used, i knew it was time to replace most maintenance items and inspect all things that kill you quicky. when i removed the radiator to change timing belts, i removed the thermostat housing to replace thermostat also. this is when i noticed the center shaft (guide) had been bent and the thermostat was stuck! so many years have i seen where someone heard it was better to allow the thermostat to free flow, so i assume that is why they did the old chevy trick and whacked the thermostat. you do want to run the engine at 212 or a little warmer. it keeps it healthier and eliminates gumming and actually helps with cooling!
sure sounds like your engine is getting hot enough to puke too quickly. ditto on the indication of head gasket needing tested.
good luck and Merry Christmas!
Wingman40
Posts: 19
Joined: Sun Apr 01, 2018 7:49 pm
Location: Pink Hill,NC
Motorcycle: 1980 Honda Goldwing GL1100

Re: Removing thermoswitch and thermostat

Post by Wingman40 »

Well double checked the fluids in radiator and reserve and topped them off. Let it warm up a little and have lite steam coming from the radiator but no leaks that I can find and gauge only gets to a little above the the quarter mark. So just a little into the white. No boil over this time and took it around the block as well. Also it's 61 here today versus 40 or so yesterday evening.
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DenverWinger
Posts: 2283
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: (s)
'80 GL1100 STD Vetter (2005-)
'93 GL1500 Aspencade (2017-)
'83 Trav-Lite Camper (2010-)
Past rides
'72 CL350 (1980-1988) sold
'78 Suzuki GS550 (1985-2005) sold
'77 GL1000 (2002-2006) sold

Re: Removing thermoswitch and thermostat

Post by DenverWinger »

Maybe there was a little crud or something under the radiator cap seal not letting it seal good. Sounds like it's OK now.... :)


There are 10 types of people in the world, those that understand binary numbers, and those that don't. :lol:

♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:
~Mark
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