Thermostats

[IJW84]

What would be the best type of thermostat to replace for my 08’ 5.7? The parts store guy saying 203 degrees one

 

[CanuckRam1313]

Depends on what you're going for.
If you're keeping it stock, head to your local dealership and get a stock OEM replacement.
If you're looking for better, I've seen many on this forum discuss 190 and 180 t-stat replacements.
For me, I'll be going to a 190 this coming summer when I get tuned and do fan adjustments.

Regardless of what you select as a temp range, ensure you bleed the air properly.
I used to have a 6.1 and did a 190 t-stat upgrade, and bleeding the air was a ******.... took a couple of go's to get it right so my temp didn't spike.
Once it was dialed in, it was smooth sailing!

 

[LoneWolf3574]

Stock OE thermostat is 203F. This will give you the best results if all you're doing is daily running and fully stock.

 

[gofishn]

just make sure you burp it. just like after feeding a baby. Got to get all the air out of the system or there will be problems, later.

 

[HemiLonestar]

And make sure the bleed hole is installed UP or you'll never get the air out of the system.

 

[GTyankee]

How to bleed the air out of the cooling system on a 5.7 hemi

www.youtube.com

if you can't get that plug out, look on the right side of the water pump,
there is a sensor & wires.
That will also work as a bleeder

 

[Highway]

Best thing i ever used for burping the air out….
https://www.harborfreight.com/no-spill-radiator-funnel-kit-58423.html

 

[IJW84]

How does the temp range work? Is it like a 203 will blow hotter air than a 193?

 

[LoneWolf3574]

How to bleed the air out of the cooling system on a 5.7 hemi

www.youtube.com

if you can't get that plug out, look on the right side of the water pump,
there is a sensor & wires.
That will also work as a bleeder

The temperature sensor you are talking about is under the AC compressor in a 5.7L Hemi truck. He would be better off not trying, it's too much effort to attempt rigging anything to try that.

Best thing i ever used for burping the air out….
https://www.harborfreight.com/no-spill-radiator-funnel-kit-58423.html

This would be best, trust the process.

 

[Daw14]

How does the temp range work? Is it like a 203 will blow hotter air than a 193?

Yes ,that is the temp your engine will maintain +or- a few degrees. Also what goes into the heater core.