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Old 06-07-2008, 02:24 PM
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I'm looking to get a lower temp thermostat. Should I get a 180 degree or 160 degree? I've heard the ls4s like to run a little hotter and that a 160 degree thermostat would mess the computer up. Is this true?
Old 06-07-2008, 02:36 PM
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Custom tune for 160, but 180 should be ok with just the stock tune from what I understand.

What's stock anyway 185 or 190?
Old 06-07-2008, 02:53 PM
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187 is what I heard but I swear its 195. I'm going to get a 160 and have my fans readjusted again. With a 160 T state you will need to reset your stock fan settings or else you will defeat the purpose of a quicker opening T stat. When I replace mine I'm going to drop that sucker into a boiling pot of water to see when it opens.
Here is a link http://www.easyperformance.com/ for you to check out. Look at the T stat article under the tech section for some dyno results and related info.
Old 06-07-2008, 03:09 PM
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Originally Posted by DavidGXP
187 is what I heard but I swear its 195. I'm going to get a 160 and have my fans readjusted again. With a 160 T state you will need to reset your stock fan settings or else you will defeat the purpose of a quicker opening T stat. When I replace mine I'm going to drop that sucker into a boiling pot of water to see when it opens.
Here is a link http://www.easyperformance.com/ for you to check out. Look at the T stat article under the tech section for some dyno results and related info.
I have the 160 and it helps, you just have to tune for it.
Old 06-08-2008, 07:49 AM
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how do you adjust your fans?
Old 06-08-2008, 08:35 AM
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Go 180 as stock on the 07 is 195. There is not a 187 stat out there for an LS4 engine.
Old 06-08-2008, 11:33 PM
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Originally Posted by Taz34SS
Go 180 as stock on the 07 is 195. There is not a 187 stat out there for an LS4 engine.
2007 MCSS stock thermostat is a 187*. Going 180* is a waste. Just reprogram your fan on time with HP Tuners program. 160* Is too cold unless your running a turbo or blower. Save your money and time for a useful mod. There is all kinds of threads about this. As Taz says do a search! P.s. look on the factory thermostat it says 86* C = 187* F. Trust me on this one i wasted the time and money i know for next time.
Old 06-08-2008, 11:49 PM
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Originally Posted by MonteSS8707
2007 MCSS stock thermostat is a 187*. Going 180* is a waste. Just reprogram your fan on time with HP Tuners program. 160* Is too cold unless your running a turbo or blower. Save your money and time for a useful mod. There is all kinds of threads about this. As Taz says do a search! P.s. look on the factory thermostat it says 86* C = 187* F. Trust me on this one i wasted the time and money i know for next time.
160 is a waste says the guy with "Xenon HID simulated lighting" and a throttle body spacer.
Old 06-09-2008, 02:52 PM
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Originally Posted by Nacho SS
160 is a waste says the guy with "Xenon HID simulated lighting" and a throttle body spacer.
$30 for damn near the same look as opposed to a couple hundred dollars. Well worth it in my opinion. Especially with gas approaching $5 per gallon. I like my throttle body spacer, I don't have any dyno numbers, and prob a waste of money. To each their own. Don't knock it till you try it. We all learn from each others mistakes, thats one of the perks of this forum. Also Nacho if you look at my post it says 180* is a waste not 160*. I said 160* isn't really nessecary unless your using forced induction where heat and detonation comes into play. But hey what do I know? I only work on cars and trucks for a living.

Last edited by MonteSS8707; 06-10-2008 at 11:34 PM.
Old 07-13-2008, 07:18 PM
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What AiRaid TBS did you use?
Old 07-13-2008, 08:34 PM
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i have a 160 in my gto.
Old 07-13-2008, 09:08 PM
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no need to change your t-stat... 160 is no good... will cause issues... and the stock t-stat is 187*....

just get a tune to adjust your fan power % and you'll be golden...

I adjusted my fans, and even in 90* heat/humidity, my ECT hasn't gotten above 197*...

our engines like to be hotter than 180* degrees anyway...

leave it as is...
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Old 07-13-2008, 09:11 PM
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Originally Posted by Taz34SS
Go 180 as stock on the 07 is 195. There is not a 187 stat out there for an LS4 engine.
yes there is.. direct from Autozone...

Part Number: 45687
Weight: 0.179 lbs.
Note: 187 degrees
Seal included. OEM temperature
Pricing: $13.99

this is the OEM t-stat... stock on 2006/2007 Monte SS/Impala SS/GXP
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Last edited by 06MonteSS; 07-14-2008 at 07:38 AM.
Old 07-13-2008, 09:57 PM
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Originally Posted by Beamie
What AiRaid TBS did you use?
Airraid no. 200-586 if i remember correctly. Its for a gmc envoy/chevy trailblazer with 4.2L straight 6. Our tb are the same as those.
Old 07-22-2008, 10:46 PM
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Originally Posted by MonteSS8707
Airraid no. 200-586 if i remember correctly. Its for a gmc envoy/chevy trailblazer with 4.2L straight 6. Our tb are the same as those.
I LOVE you man. T'anks!



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