90 Lumina Euro temp gauge

Good day,
Have a 90 lumina euro w/3.1 V6 w/134000km (83000mi). It sat for over a year until I replaced the trannie, now I am using as my commuter to work
(50mi/day).
The scale on the temp gauge is 40C(104F) on the bottom and 125C(257F) on the top. That means that the middle of the gauge is 82.5C(180.5F). Once warmed up, the gauge usually reads at between 1/4 and 1/2, translating to about 65C - 72C(152F - 161F).
I usually drive imports, where the temp of the engine is at least 180 once fully warmed. What is the running temperature of my Lumina supposed to be?
149F seems too low....
The temp doesn't fluctuate at all once warmed up, which kinda rules out sticky thermostat. I am located in Canada, current ambient temperature is -25C(-13F), and the car is not throwing great heat.
I am thinking of replacing the thermostat with a higher temp (180F), what does everyone recommend? Anyone see any potential problems with doing this? Will I create leaks if there is a weakness in the cooling system?
Thanks Terry in Winterpeg
-- Message posted using http://www.talkaboutautos.com/group/alt.autos.gm / More information at http://www.talkaboutautos.com/faq.html
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
A 195 thermostat is called for.

---- Posted via Pronews.com - Premium Corporate Usenet News Provider ---- http://www.pronews.com offers corporate packages that have access to 100,000+ newsgroups
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
disallow wrote:

195F is the norm for vehicles with pollution equipment and computers. Your temp gauge may not be linear. Few are. Replace the thermostat with a 195F Stant. Don't get a cheap off brand - most are bad from the factory. It could be that your car needs a bit of help with cardboard in front of the radiator in winter. Unlikely it will cause any problems. If your cap is good then the boil point will be above 212F, depending on the antifreeze mix and pressure.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
My Lumina started warming up slow (and it doesn't get that cold in Texas), and the temp gauge was staying about midway between cold and center. Replacing the thermostat brought the temp range back to the center and quick heater warmup. Roy

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
OK so I went to replace the thermostat. And ended up snapping a bolt.
There was a bit of the stud left, so I soaked the bold in penetrating oil and let it sit with a heat lamp on it (its REALLY cold here, -20C). Cleaned it with brake cleaner at tried to get vise grips on it to no avail. Decided to drill it out. The tap hole size for this 8mm bolt is a 17/64" drill bit. I started the hole with a punch and a 9/64" bit. It was pretty well centered, I just increase size from there. One thing I realized though is that the holes for the t-stat housing are different depths.
Now the challenge of getting rid of the air pockets in the cooling system. The heat gauge is still moving quite a bit. I will try to bleed the system again tonight.
Any pointers?
t
ROY BRAGG wrote:

--
Message posted via CarKB.com
http://www.carkb.com/Uwe/Forums.aspx/gmc/200712/1
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.