Upside down thermostat

N

Nheels

Petty Officer 2nd Class
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Mar 8, 2021
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132
Engine is a 2008 300-gi-j.

As a preventative measure this year I thought I would change out the thermostats as to the best of my knowledge they've never been done. So I took it apart and then reinstalled thermostats the same way that I took them out at. Then started looking at a diagram and realized that they were upside down (spring down). I have never had any cooling issues and they regularly runs at 160 to 170 ish. Confirmed using a Diacom.

I'm going to reinstall the proper way, with the spring facing up towards the gadget, but anyone understand why I wasn't overheating??
 
Grub54891

Grub54891

Admiral
Joined
Jun 17, 2012
Messages
6,184
Because they are installed correctly with the spring down. If you install them with the spring up, it WILL overheat. I’m old school, what is a diacom? Or do you mean a diagram?
 
N

Nheels

Petty Officer 2nd Class
Joined
Mar 8, 2021
Messages
132
I'll clarify that it was opposite of this diagram. Spring down towards the housing is what I meant.
1000001747.jpg
 
N

Nheels

Petty Officer 2nd Class
Joined
Mar 8, 2021
Messages
132
Grub54891 said:
Because they are installed correctly with the spring down. If you install them with the spring up, it WILL overheat. I’m old school, what is a diacom? Or do you mean a diagram?
Click to expand...
I posted a diagram of the opposite of how it was installed.

Rinda Diacom is the diagnostic set.
 
Lou C

Lou C

Supreme Mariner
Joined
Nov 10, 2002
Messages
13,170
Yep I was confused here too! Every application I have ever seen of the basic GM small block design be it a V6 or V8 always has the spring facing down be it automotive or marine. It has to because of how the coolant flows thru the block, up to cyl heads, then up from the intake manifold crossover to the stat housing!
 
N

Nheels

Petty Officer 2nd Class
Joined
Mar 8, 2021
Messages
132
Lou C said:
Yep I was confused here too! Every application I have ever seen of the basic GM small block design be it a V6 or V8 always has the spring facing down be it automotive or marine. It has to because of how the coolant flows thru the block, up to cyl heads, then up from the intake manifold crossover to the stat housing!
Click to expand...
I see that now, but it was installed incorrectly before, so I was wondering why I never had overheating.. it's just very odd.
 
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