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Re: [Healeys] Thermostats

To: Harold Manifold <manifold@telus.net>
Subject: Re: [Healeys] Thermostats
From: Robert Duquette <robert.duquette@me.com>
Date: Wed, 19 Sep 2018 19:03:26 +0000 (GMT) MailServer1817B38.10000-1817B-0-9a6a56287ec5
Cc: 'Forum Healeys' <Healeys@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
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I beg to differ.=C2=A0 ;)=C2=A0 We have 2 seasons in Ottawa (ON Canada).=C2=
=A0 Winter and 'road construction'.=0A=0A( Others agree that we have 2 sea=
sons, but name them differently. "Too Hot" and "Too Cold". )=0A=0A=0A=0ATh=
is summer was particularly hot, with high humidity.=0A=0AMonth starting on=
=C2=A0=C2=A0 =C2=A0Maximum=C2=A0=C2=A0 =C2=A0=0ASep 2018 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 =C2=A0 =C2=A0 32.0 =C2=B0C =C2=A0=C2=A0 =C2=
=A0=0AAug 2018 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 =C2=A0=
 32.8 =C2=B0C =C2=A0=C2=A0 =C2=A0=0AJul 2018=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 36.0 =C2=B0C =C2=A0=C2=A0 =C2=
=A0 =C2=A0=0AJun 2018=C2=A0=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0=C2=A0=C2=A0 33.6 =C2=B0C =C2=A0=C2=A0 =C2=A0 =C2=A0=0AMay 2018=C2=A0=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0 29.8 =C2=B0C=
=0A=0A=0AThis seems to think that we have 4 seasons???=0A=0Ahttps://en.wik=
ipedia.org/wiki/Ottawa#Climate=0A=0A=0ARobert=0A55 BN1=0A=0A=0A=0A=0AOn Se=
p 16, 2018, at 02:44 PM, Harold Manifold <manifold@telus.net> wrote:=0A=0A=
=0AI tried to help myself but I have once again been drawn into a discussi=
on about engine thermostats. As I read the posts the underlying questions =
are what is the best thermostat and do I have the right one? I will correc=
t one Poster who suggested the role of the thermostat was to control press=
ure in the cooling system. While thermostats may have an effect on pressur=
e in the cooling system that is the job of the radiator cap.=0A=C2=A0=0AI =
suggest the best thermostat has these features: fails in the open position=
 i.e. coolant circulates through the radiator. You can get home with a coo=
l engine but not a hot one. Blocks circulation of coolant between the engi=
ne and radiator until the engine has reached its predetermined temperature=
. i.e. The thermostat fits the housing and seals when closed. The thermost=
at fully opens about 15-20 degrees above its rated temperature. The thermo=
stat should have a =E2=80=9Cjiggle pin=E2=80=9D or =E2=80=9Ccheck valve=E2=
=80=9D that allows trapped air in the cooling system to pass through the t=
hermostat and be released from the system.=0A=C2=A0=0ADo I have the right =
one? Based on old manuals I have seen there were two temperature ratings f=
or 3000 Healeys, Summer 70 Deg C/160 Deg F and Winter 86 Deg C/185 Deg F. =
I believe the thinking behind the two thermostat approach was to reduce bo=
iling the radiator in summer and to make the heater work better in the win=
ter. Depending on where you live and and the=C2=A0driving conditions may i=
nfluence which end of the range you want to be at. If you live in Florida =
and/or drive in slow moving traffic I would suggest the 160 degree. Your c=
ooling system will have more reserve when=C2=A0traffic slows. If you live =
in Ottawa 185 is likely better as it is winter all the time. However, the =
most important factor=C2=A0is not opening temperature but does the thermos=
tat properly control the coolant temperature. If you have a 160 degree the=
rmostat and the coolant temperature fluctuates between 160-180 then it is =
the right one. Likewise the 185 should stay between 185-205. It is most im=
portant for the cooling system to stay between the lower and upper tempera=
tures. If the temperature is not between these two points then the cooling=
 system is "not in control".=0A=C2=A0=0ABottom line is if the cooling syst=
em is "in control" and you are happy with the way the car warms up=C2=A0yo=
u have the right thermostat.=0A=C2=A0=0AHarold
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<html><body><div>I beg to differ.&nbsp; ;)&nbsp; We have 2 seasons in Ottawa 
(ON Canad=
a).&nbsp; Winter and 'road construction'.<br></div><div>( Others agree tha=
t we have 2 seasons, but name them differently. "Too Hot" and "Too Cold". =
)<br data-mce-bogus=3D"1"></div><div><br data-mce-bogus=3D"1"></div><div>T=
his summer was particularly hot, with high humidity.<br data-mce-bogus=3D"=
1"></div><div>Month starting on&nbsp;&nbsp; &nbsp;Maximum&nbsp;&nbsp; &nbs=
p;<br>Sep 2018 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbs=
p; 32.0 =C2=B0C &nbsp;&nbsp; &nbsp; <br>Aug 2018 &nbsp; &nbsp; &nbsp; &nbs=
p; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; 32.8 =C2=B0C &nbsp;&nbsp; &nbsp; <br>=
Jul 2018&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;  &nbsp; &nb=
sp;&nbsp; 36.0 =C2=B0C &nbsp;&nbsp; &nbsp; &nbsp;<br>Jun 2018&nbsp;&nbsp; =
&nbsp;  &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; 33.6 =C2=B0C=
 &nbsp;&nbsp; &nbsp; &nbsp;<br>May 2018&nbsp;&nbsp; &nbsp;  &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; 29.8 =C2=B0C</div><div><br data-mce-bogu=
s=3D"1"></div><div>This seems to think that we have 4 seasons???<br data-m=
ce-bogus=3D"1"></div><div><a href=3D"https://en.wikipedia.org/wiki/Ottawa#=
Climate">https://en.wikipedia.org/wiki/Ottawa#Climate</a></div><div><br da=
ta-mce-bogus=3D"1"></div><div class=3D"x-apple-signature">Robert</div><div=
 class=3D"x-apple-signature">55 BN1<br data-mce-bogus=3D"1"></div><div cla=
ss=3D"x-apple-signature"><br data-mce-bogus=3D"1"></div><div><br>On Sep 16=
, 2018, at 02:44 PM, Harold Manifold &lt;manifold@telus.net&gt; wrote:<br>=
<br><div><blockquote type=3D"cite"><div class=3D"msg-quote"><div dir=3D"lt=
r" align=3D"left"><span class=3D"436134816-16092018"><span data-mce-style=3D=
"color: #0000ff; font-family: Arial; font-size: small;" style=3D"color: #0=
000ff; font-family: Arial; font-size: small;" size=3D"2" face=3D"Arial" co=
lor=3D"#0000ff">I tried to help myself but I have once again been drawn in=
to a discussion about engine thermostats. As I read the posts the underlyi=
ng questions are what is the best thermostat and do I have the right one? =
I will correct one Poster who suggested the role of the thermostat was to =
control pressure in the cooling system. While thermostats may have an effe=
ct on pressure in the cooling system that is the job of the radiator cap. =
</span></span></div><div dir=3D"ltr" align=3D"left"><span class=3D"4361348=
16-16092018"><span data-mce-style=3D"color: #0000ff; font-family: Arial; f=
ont-size: small;" style=3D"color: #0000ff; font-family: Arial; font-size: =
small;" size=3D"2" face=3D"Arial" color=3D"#0000ff"></span></span>&nbsp;</=
div><div dir=3D"ltr" align=3D"left"><span data-mce-style=3D"font-family: A=
rial;" style=3D"font-family: Arial;" face=3D"Arial"><span data-mce-style=3D=
"font-size: small;" style=3D"font-size: small;" size=3D"2"><span data-mce-=
style=3D"color: #0000ff;" style=3D"color: #0000ff;" color=3D"#0000ff"><spa=
n class=3D"436134816-16092018">I suggest the best thermostat has these fea=
tures: fails in the open position i.e. coolant circulates through the radi=
ator. You can get home with a cool engine but not a hot one. Blocks circul=
ation of coolant between the engine and radiator until the engine has reac=
hed its predetermined temperature. i.e. The thermostat fits the housing an=
d seals when closed. </span><span class=3D"436134816-16092018">The thermos=
tat fully opens about 15-20 degrees above its rated temperature. The therm=
ostat should have a =E2=80=9Cjiggle pin=E2=80=9D or =E2=80=9Ccheck valve=E2=
=80=9D that allows trapped air in the cooling system to pass through the t=
hermostat and be released from the system.</span></span></span></span></di=
v><div dir=3D"ltr" align=3D"left"><span data-mce-style=3D"color: #0000ff; =
font-family: Arial; font-size: small;" style=3D"color: #0000ff; font-famil=
y: Arial; font-size: small;" size=3D"2" face=3D"Arial" color=3D"#0000ff"><=
span class=3D"436134816-16092018"></span></span>&nbsp;</div><div dir=3D"lt=
r" align=3D"left"><span data-mce-style=3D"color: #0000ff; font-family: Ari=
al; font-size: small;" style=3D"color: #0000ff; font-family: Arial; font-s=
ize: small;" size=3D"2" face=3D"Arial" color=3D"#0000ff"><span class=3D"43=
6134816-16092018">Do I have the right one? Based on old manuals I have see=
n there were two temperature ratings for 3000 Healeys, Summer 70 Deg C/160=
 Deg F and Winter 86 Deg C/185 Deg F. I believe the thinking behind the tw=
o thermostat approach was to reduce boiling the radiator in summer and to =
make the heater work better in the winter. Depending on where you live and=
 and the&nbsp;driving conditions may influence which end of the range you =
want to be at. If you live in Florida and/or drive in slow moving traffic =
I would suggest the 160 degree. Your cooling system will have more reserve=
 when&nbsp;traffic slows. If you live in Ottawa 185 is likely better as it=
 is winter all the time. However, the most important factor&nbsp;is not op=
ening temperature but does the thermostat properly control the coolant tem=
perature. If you have a 160 degree thermostat and the coolant temperature =
fluctuates between 160-180 then it is the right one. Likewise the 185 shou=
ld stay between 185-205. It is most important for the cooling system to st=
ay between the lower and upper temperatures. If the temperature is not bet=
ween these two points then the cooling system is "not in control".</span><=
/span></div><div dir=3D"ltr" align=3D"left"><span data-mce-style=3D"color:=
 #0000ff; font-family: Arial; font-size: small;" style=3D"color: #0000ff; =
font-family: Arial; font-size: small;" size=3D"2" face=3D"Arial" color=3D"=
#0000ff"><span class=3D"436134816-16092018"></span></span>&nbsp;</div><div=
 dir=3D"ltr" align=3D"left"><span data-mce-style=3D"color: #0000ff; font-f=
amily: Arial; font-size: small;" style=3D"color: #0000ff; font-family: Ari=
al; font-size: small;" size=3D"2" face=3D"Arial" color=3D"#0000ff"><span c=
lass=3D"436134816-16092018">Bottom line is if the cooling system is "in co=
ntrol" and you are happy with the way the car warms up&nbsp;you have the r=
ight thermostat.</span></span></div><div dir=3D"ltr" align=3D"left"><span =
data-mce-style=3D"color: #0000ff; font-family: Arial; font-size: small;" s=
tyle=3D"color: #0000ff; font-family: Arial; font-size: small;" size=3D"2" =
face=3D"Arial" color=3D"#0000ff"><span class=3D"436134816-16092018"></span=
></span>&nbsp;</div><div dir=3D"ltr" align=3D"left"><span data-mce-style=3D=
"font-family: Arial;" style=3D"font-family: Arial;" face=3D"Arial"><span d=
ata-mce-style=3D"font-size: small;" style=3D"font-size: small;" size=3D"2"=
><span data-mce-style=3D"color: #0000ff;" style=3D"color: #0000ff;" color=3D=
"#0000ff"><span class=3D"436134816-16092018">Harold</span></span></span></=
span></div></div></blockquote></div></div></body></html>
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