Thermostat question


Information and questions on GL1200 Goldwings (1984-1987)
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harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Thermostat question

Postby harkgold » Wed Jun 27, 2012 3:44 pm



I'm having difficulty finding a replacement thermostat for my '84 GL1200 Interstate. Is there an alternate 180 degree thermostat from another vehicle, say a car for example, that will work on my bike that is more readily available?
Thanks!
Harkgold



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seabee_
Posts: 494
Joined: Sun May 29, 2011 8:17 pm
Location: sterling heights, mi
Motorcycle: 1985 Honda Goldwing GL1200
117k miles
1977 Kawasaki kz400
1978 Suzuki GSXr750
1980 Kawasaki GPZ400
1975 Honda CB360T

Re: Thermostat question

Postby seabee_ » Wed Jun 27, 2012 3:56 pm

Thermostat 180 degree
Napa - 535080 possible new part no. 33488
Stant - 45868
AutoZone - 15868
Honda part no. 19300-MG9-000
Paul
CE1 Navy Seabees/RET
1981 to 2002
ASE Mechanic

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SteveB123
Posts: 842
Joined: Thu Apr 05, 2012 9:29 am
Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: Thermostat question

Postby SteveB123 » Wed Jun 27, 2012 5:28 pm

Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Re: Thermostat question

Postby harkgold » Thu Jun 28, 2012 8:14 am

Thanks guys for the tips!
Upon the suggestions of other motorcyclists, I pulled the thermostat while I had the radiator off the bike thinking I should just go ahead and replace the thermostat since I could easily get to it.
The bike has just turned over 55,000 miles and I can tell that this is probably the original 28 year old thermostat.
I have not yet tested the thermostat according to the shop manual but I do notice that the needle on the temp gauge never passes the straight up position and most of the time the needle leans slightly to the left toward the cooler side even on the hottest of days. This indicates to me that the thermostat is working properly but other Gold Wing owners are telling me that due to the bikes age I should just go ahead and replace the thermostat while I'm under the hood just to be on the safe side.
Is there any wisdom to their advice, or should I figure "What the heck...if it works leave it alone"!

Also, is there a proper way to position the thermostat in the housing? I can't recall the position it was in when I pulled it out. I notice there is a little hole on the rim of the mounting plate. Does the hole need to be in any certain position (up, down, or sideways)....or does it matter?

Thanks again guys! :D

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SteveB123
Posts: 842
Joined: Thu Apr 05, 2012 9:29 am
Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: Thermostat question

Postby SteveB123 » Thu Jun 28, 2012 10:00 am

Hole goes up....damn 20 char limit.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Re: Thermostat question

Postby harkgold » Thu Jun 28, 2012 11:32 am

SteveB123 wrote:Hole goes up....damn 20 char limit.


Thanks Steve! What is a char limit?

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WingAdmin
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Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Thermostat question

Postby WingAdmin » Thu Jun 28, 2012 11:38 am

harkgold wrote:
SteveB123 wrote:Hole goes up....damn 20 char limit.


Thanks Steve! What is a char limit?


He means the system won't let you post a message with less than 20 characters, to avoid people posting one-word answers and the like. :)

harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Re: Thermostat question

Postby harkgold » Thu Jun 28, 2012 11:47 am

WingAdmin wrote:
harkgold wrote:
SteveB123 wrote:Hole goes up....damn 20 char limit.


Thanks Steve! What is a char limit?


He means the system won't let you post a message with less than 20 characters, to avoid people posting one-word answers and the like. :)


Ohhhhhh. I understand! I guess I've never experienced that. But I probably tend to be a little too windy at times.

harkgold
Posts: 147
Joined: Thu Nov 03, 2011 9:19 pm
Location: Des Moines, Iowa
Motorcycle: 1984 GL1200 Interstate

Re: Thermostat question

Postby harkgold » Sun Jul 01, 2012 5:28 pm

SteveB123 wrote:Hole goes up....damn 20 char limit.


Ok guys. For the sake of discussion I ran this topic by several of my local wrench turners and I'm getting several varying opinions regarding which way the little hole on the thermostat is positioned when it is installed in the housing. And some very adamant opinions began to surface.
Some argue that the hole is supposed to be positioned at the top to allow coolant to dam up behind the thermostat in order to build up heat faster and open the thermostat sooner. And their argument is that placing the hole at the bottom allows coolant to just flow by the thermostat faster causing it to take longer to warm up and open up. Others believe the hole should go at the bottom to allow a continuous flow of heated coolant to flow by the thermostat faster in order to open it quicker with their argument that dammed up coolant takes longer to heat up and activate the thermostat. Also, they believe the hole should go to the bottom in order to keep any residue that may accumulate in the system from damming up behind the thermostat and possibly interfering with its function. And then others claim that it makes no difference.
Personally, I'm beginning to believe the later because if it made a difference the shop manuals would probably state the importance of a properly placed hole position; which I am unable to find a manual that does indicate any importance regarding this.
Also and indicator that may indicate that it goes to the bottom is the fact that when reading the temperature rating which is engraved on the diaphram the hole is positioned at the bottom.
Any more expert opinions out there regarding this subject.
Harkgold

dbduely
Posts: 9
Joined: Mon May 14, 2012 10:45 pm
Location: Las Vegas, Nevada
Motorcycle: 1983 GL1100I
1985 GL1200LTD

Re: Thermostat question

Postby dbduely » Mon Jul 02, 2012 10:56 pm

The hole in the thermostat is help bleed off air in the coolant system. And is in all thermostats for cars, bikes, or truck weather flat, or vertical. I guess you could say put it up but it would make so little differance to worry about. Have a great day and ride safe. Doug




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