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Old 12-27-2006, 11:46 PM   #31
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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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Old 12-28-2006, 12:03 AM   #32
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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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Old 12-28-2006, 01:22 AM   #33
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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.
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Old 12-28-2006, 11:19 AM   #34
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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.
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Old 12-28-2006, 11:23 AM   #35
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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?
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Old 12-28-2006, 11:28 AM   #36
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I think the source was stated as the FSM.
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Old 12-28-2006, 11:29 AM   #37
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Quote:
Originally Posted by BillBoost37
I think the source was stated as the FSM.
Lord knows we've never seen a mistake or misinformation in THAT book. For chrissakes, the superchargers aren't servicable items, are they?
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Old 12-28-2006, 11:33 AM   #38
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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"
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Old 12-28-2006, 11:48 AM   #39
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Quote:
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"
Compared to the 89-95 Manuals... The 97-98 and up manuals suck

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Old 12-28-2006, 02:17 PM   #40
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Quote:
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.
Can you further explain this please. This won't affect A/F mixture because that is all up to the MAF and O2? And I am also confused as to how the IAT and coolant temperature are related.
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