thermostat
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All Bonneville through 99 should have no issues at all with a 180 T-Stat..
The 00+ does have a code for not meeting a certain temp range.. But I'd like to see a service manual on the 00+ to see if that temp is actually 176...
Now on my older Bonneville I'll bet I could get away with a 160, but barely... So I run and am happy with the 180'*..
And I agree... I can't remember the last time anyone had an issue with a 180F T-stat
Same goes for all of the GP guys and Gals as well
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The 00+ does have a code for not meeting a certain temp range.. But I'd like to see a service manual on the 00+ to see if that temp is actually 176...
Now on my older Bonneville I'll bet I could get away with a 160, but barely... So I run and am happy with the 180'*..
And I agree... I can't remember the last time anyone had an issue with a 180F T-stat
Same goes for all of the GP guys and Gals as well
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Borrowed from the Intense-Racing web site..
For those with a 2000 and newer 3800 vehicles, your PCM will not be happy with a 160F thermostat. After a few driving cycles, you'll trigger DTC P0128 because your PCM won't think your engine is warming up properly. There are 3 ways to circumvent this. First, you can opt for the 180F thermostat. Second, you can simply unplug the IAT and susbstitute an 18k-Ohm resistor. This will prevent the PCM from ever running it'* test. Or third, you can have your PCM custom programmed.
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For those with a 2000 and newer 3800 vehicles, your PCM will not be happy with a 160F thermostat. After a few driving cycles, you'll trigger DTC P0128 because your PCM won't think your engine is warming up properly. There are 3 ways to circumvent this. First, you can opt for the 180F thermostat. Second, you can simply unplug the IAT and susbstitute an 18k-Ohm resistor. This will prevent the PCM from ever running it'* test. Or third, you can have your PCM custom programmed.
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I would venture to say we have at LEAST 200 thermostats changed to 180 in 2000 and newer cars here.
We've NEVER seen a SINGLE instance of a code or ill-running car in these cases. We over 7000 members and 4 years of FORUM experience in this matter.
Find me a 2000 on this forum that has a confirmed code caused by a 180 thermostat, and I'll pay to have that thermostat gold-plated.
We've NEVER seen a SINGLE instance of a code or ill-running car in these cases. We over 7000 members and 4 years of FORUM experience in this matter.
Find me a 2000 on this forum that has a confirmed code caused by a 180 thermostat, and I'll pay to have that thermostat gold-plated.
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wow the controversy 
But if GM'* primary reason for using the 195 was for emission purposes, and the vast majority of members have only good results with the 180, I'm definitely getting one.
But if GM'* primary reason for using the 195 was for emission purposes, and the vast majority of members have only good results with the 180, I'm definitely getting one.
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zuper, there really isn't a controversy here. The two members who spoke of potential problems are new here, and have no idea how much success we've had with the 180'*. Nor are they aware with the complete lack of problems. Many of us run them year-round, and don't have problems in the winter either.
I'd be interested to see the source of the information posted in the negative in this topic. Is it a published source? Or just word of mouth?
I'd be interested to see the source of the information posted in the negative in this topic. Is it a published source? Or just word of mouth?
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Originally Posted by BillBoost37
I think the source was stated as the FSM. :?:
DINOSAURUS BOOSTUS
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From: Enfield, CT
Don't get me started.
97 FSM basically is quoted as saying on page 1 "We were in the middle of revamping the manuals and decided to publish part way through....good luck"
97 FSM basically is quoted as saying on page 1 "We were in the middle of revamping the manuals and decided to publish part way through....good luck"
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Originally Posted by BillBoost37
Don't get me started.
97 FSM basically is quoted as saying on page 1 "We were in the middle of revamping the manuals and decided to publish part way through....good luck"
97 FSM basically is quoted as saying on page 1 "We were in the middle of revamping the manuals and decided to publish part way through....good luck"
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From: MI
Originally Posted by jr's3800
Borrowed from the Intense-Racing web site..
For those with a 2000 and newer 3800 vehicles, your PCM will not be happy with a 160F thermostat. After a few driving cycles, you'll trigger DTC P0128 because your PCM won't think your engine is warming up properly. There are 3 ways to circumvent this. First, you can opt for the 180F thermostat. Second, you can simply unplug the IAT and susbstitute an 18k-Ohm resistor. This will prevent the PCM from ever running it'* test. Or third, you can have your PCM custom programmed.
For those with a 2000 and newer 3800 vehicles, your PCM will not be happy with a 160F thermostat. After a few driving cycles, you'll trigger DTC P0128 because your PCM won't think your engine is warming up properly. There are 3 ways to circumvent this. First, you can opt for the 180F thermostat. Second, you can simply unplug the IAT and susbstitute an 18k-Ohm resistor. This will prevent the PCM from ever running it'* test. Or third, you can have your PCM custom programmed.
