180* stat (bad idea) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-29-2006, 10:28 PM   #1
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Default 180* stat (bad idea)

I'm planning on doing a coolant flush, and stat change (thier due) and I've been hearing that changing the stat from a 195 to a 180 is a good uprade if you plan on performance tuning your car. Recently I went to my mechanic and he said that changing the stat from a 195* to 180* is a bad idea, and that in doing so the cars computer will get messed up. I'd like to hear what everyone has to say about this, because i don't want to start work on my car and possibly throw off the cars coolant system. Is it safe to put in a 180* stat, and what will the gains be in doing so.
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Old 03-29-2006, 10:56 PM   #2
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Default Re: 180* stat (bad idea)

Quote:
Originally Posted by Richard V
I'm planning on doing a coolant flush, and stat change (thier due) and I've been hearing that changing the stat from a 195 to a 180 is a good uprade if you plan on performance tuning your car. Recently I went to my mechanic and he said that changing the stat from a 195* to 180* is a bad idea, and that in doing so the cars computer will get messed up. I'd like to hear what everyone has to say about this, because i don't want to start work on my car and possibly throw off the cars coolant system. Is it safe to put in a 180* stat, and what will the gains be in doing so.
he is wrong.


IT keeps the temperature down which IMO (may not be true but opinion:

- Reduces chance of LIM and UIM gakset failing as higher temps will eat them away quicker
- Better cooling of transmission, if engine is 15 degrees colder trans will also be colder because the engine is sitting on top of it

- to add to that last statement trans fluid runs thru the radiator along with the coolant which is a lower temp which MAY help keep the overall trans temp a few degrees colder.


NEGATIVES:

car does not have a great heater.
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Old 03-29-2006, 11:19 PM   #3
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I've never noticed a heat difference in the heater, at least not with an un-drilled 180. I run drilled in the winter in Oregon, and have no problems.

The first change the vast majority of owners here do (regardless of performance mods) is the 180. It'* a MAINTENANCE change for reliablity reasons.

Your mechanic is simply misinformed.
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Old 03-29-2006, 11:19 PM   #4
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Dozens and dozens of members have already done it on here without a single incident. The problems start at 160 or cool t-stats (modded cars program around this issue). It really helps with the engine cooling to keep the engine out of the red zone on hot days. I ran one for a couple years without issue.
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Old 03-29-2006, 11:31 PM   #5
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ok so no probs resulting from the switch, my next question is where can i find the 180* and what is the part #, everywhere i look the only part available is the 195*
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Old 03-29-2006, 11:35 PM   #6
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i have a 180 in mine and i don't see any adverse affects and my heater works almost too well...
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Old 03-29-2006, 11:47 PM   #7
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Quote:
Originally Posted by wjcollier07
i have a 180 in mine and i don't see any adverse affects and my heater works almost too well...
Been running the 180F in my 95 from the first week I had it... Well over 8 years now... And well over 6 in the 91 LE... Both cars consistantly do over 30mpg on the road... I managed 33 at the end of March begining of april in cold weather up north when I went home a couple of years ago... No adverse affects here...

You will have to have the parts guys do their research... It should be a 44mm thermostat... I believe that the part number may be 1 number diffrent from the 195F thermostat... They had to dig a little to find my 180 for me, it only took them a minute...

Even the Mitsubishi which has a 192F thermostat runs a 180F they had to search a little for that one as well...

I have seen a couple places that have thermostats on the shelf, there would be the first 3 numbers designationg the part( look up the correct one for your application ) and then there would be the other 3 numbers which would designate the thermostat temperature rating

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Old 03-30-2006, 12:07 AM   #8
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Quote:
Originally Posted by willwren
I've never noticed a heat difference in the heater, at least not with an un-drilled 180. I run drilled in the winter in Oregon, and have no problems.

The first change the vast majority of owners here do (regardless of performance mods) is the 180. It'* a MAINTENANCE change for reliablity reasons.

Your mechanic is simply misinformed.
Not to sound dumb...but does this ring true for all for year'* (meaning, my 2000)?
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Old 03-30-2006, 12:12 AM   #9
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Pep Boys has them.

Do what I did. You find the replacement for yours and then find one that looks exactly like it but at 180. That'* what I did. I am back up to a 200 because I am going to AK and I have not had my computer reprogramed.

If you do get a 180, IMO, get the computer flashed. The car see 180 and will burn a little rore fuel trying to get the car at 200. Not a problem. Little more fuel - Little more power
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Old 03-30-2006, 12:16 AM   #10
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Quote:
Originally Posted by Cheetah
Pep Boys has them.

Do what I did. You find the replacement for yours and then find one that looks exactly like it but at 180. That'* what I did. I am back up to a 200 because I am going to AK and I have not had my computer reprogramed.

If you do get a 180, IMO, get the computer flashed. The car see 180 and will burn a little rore fuel trying to get the car at 200. Not a problem. Little more fuel - Little more power
I don't think it burns more fuel. I just did a 400 mile trip to Chicago and back yesterday and got 31.7 mpg...
It'* just hard to keep the foot off the gas!

*EDIT*

I recently changed mine. Here'* some before/after pics of the temp gauge. Both were taken after being on the highway for over an hour, upper 30'* outside.
195* T-stat

180* T-stat


I'd say it'* a good thing...
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