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Display Mesage #94405


thermostat replacement question = part number requested
Written by spacetiger_j... on 6/24/2010 at 01:21 am

Fred, When I check the specs, I find they are the same:

This is what I posted on a CX500 forum:
The Haynes manual indicates the thermostat should open at 176-183 F (80-84 C)
and be fully open at 199-207 F (93-97 C). If you put a 180 degree thermostat
on, it will open a little above 160 and be fully open by 180. I know this
because I just replaced my thermostat in my PC800. I tested a 180 one and know
it opens early and is wide open at the indicated temp (180). This is too low
for either bike. With a 50/50 mix of coolant under pressure, the boiling point
is 258 F (125 C) and if not under pressure it is 226 F (107.7 C). So I think
you have good margin if you are running a 195 F thermostat. I believe if you
run the bike lower in temp it will not be as efficient (will show up in lower
MPG) and may lead to possible carbon build up etc (have seen this in engines run
without a thermostat).

BTW, I had to change the termostat I used. I did use a 195 degree Stant, but
found it still let the bike get hot. The fan kicked in and while it was going
to stabilize, I just could help feels looking my naked PC that I did not want to
strip her down again and risk breaking some tabs - even if they are not that
hard to fix - so, I bought the correct Honda part and paid a (~$20) premium.
For this, I have the same part it came from the factory (larger opening than the
Stant).

Jerry

--- In ipcrc@yahoogroups.com, "goldwingman40" <goldwingman@...> wrote:
>
> Jerry,
> The PC thermostat is a 180 degree start to open and your GL500 might be a 195
degree opaning which would answer the wider operating range of the PC vs GL500.
This range would also be affected by the fan cut in temperature.
> Fred
>
>
>
>
> --- In ipcrc@yahoogroups.com, "spacetiger_jc1981" <sanae.ej@> wrote:
> >
> > Rich - thanks for the part number!
> >
> > John - I will check functionality of the old thermostat before replacement
to verify it is or isn't a problem. I have a GL 500 water cooled bike with
electric fan (conversion). The temp gauge does not move much once warmed up.
On cool days it might run a bit cooler, but I expect the thermostat to keep the
temp a constant temp - like our car temp. The only time it should vary is when
it is really hot. Then it might behave like you describe. I have not
experienced this yet on my GL500.
> >
> > I will post back when I finish the maintenance this weekend.
> >
> > Jerry
> >
> > --- In ipcrc@yahoogroups.com, "literidr" <literidr@> wrote:
> > >
> > > Hey Jerry,
> > >
> > > I don't know of an automotive replacement for the thermostat. However,
it's normal for your gauge to read low when it's cold and up to around half way
when its hot or you're in heavy traffic. Your thermostat opens at the point on
the gauge where the broken white line begins again. The fan doesn't kick in to
assist cooling until the temperature gets to about the halfway mark on your
gauge. Your bike isn't "overheating" until it reaches the upper end of the
gauge. If your bike is operating between where the thermostat opens and where
the fan comes on, then it's operating normally.
> > >
> > > Hope this helps,
> > >
> > > John Handford, literidr@
> > > Taylors, SC
> > > '90 PC "Spirit"
> > > '94 PC "Chance"
> > >
> > >
> > >
> > > --- In ipcrc@yahoogroups.com, "spacetiger_jc1981" <sanae.ej@> wrote:
> > > >
> > > > Hello, I have spent 40 minutes searching for an answer with no luck.
> > > >
> > > > Can someone please post the automotive equivalent manufacture/part
number number and car application for our PC thermostat (Product: 19300MB0003)
> > > >
> > > > My temp reading is not stable - low when cold, hot when stuck in
traffic. To me, the thermostat sounds like the most likely cause.
> > > >
> > > > Jerry
> > > >
> > >
> >
>

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