thermostats

[Black Sunshine]

I have a 98 chevy with a 6.5 turbo..
It want getting very warm so i decided the change the thermosats
its got two of them.
It warm up pretty good (on the temp gauge)for a couple days, but every day it would
warm up a little less every day. for about a week.
Now its( thetemp ) right back to were it was before the new ones were installed..do you guys think the thermostsats are duds

[Yukon6.2]

Hi Black Sunshine
Welcome to the page.Where in Canada are you?
Why did you change the t-states?And what make did you get?
Did you get all the air out after you changed the t-states?
And is the top rad hose getting hard when it runs?Any bubbling int the overflow reservoir?
Once you answer those questions,somebody else may have some more.But someone will have a few things to check once there is more info.
Thomas

[Jesus]

I have a 98 chevy with a 6.5 turbo..
It want getting very warm so i decided the change the thermosats
its got two of them.
It warm up pretty good (on the temp gauge)for a couple days, but every day it would
warm up a little less every day. for about a week.
Now its( thetemp ) right back to were it was before the new ones were installed..do you guys think the thermostsats are duds

http://www.summitracing.com/search/part-type/thermostats-mechanical/make/chevrolet/engine-size/6-5l-396

Had good luck with mr gasket.. oem no