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Old 04-27-2006, 11:55 AM   #1
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Default 180 degree thermostat question

hey all,
i've been trolling a bit and noticed that most of you guys have swapped down to a 180 degree thermostat, some are using a 160. i have a mostly stock (intake and ignition mods) '95 L27. i figured the 180 would be my best bet.

i noticed some people mentioned drilling the t-stat before installation, but i haven't seen any details beyond that. does anyone have a picture of a drilled T-stat or a least a good explanation of what exactly to do?

thanks
-Marik
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Old 04-27-2006, 11:59 AM   #2
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The 180 will be best for you since you are practically stock. 160 is for more heavily modified cars. Drilling the 180 keeps a small but constant flow of coolant all the time, good for hot climates. It consists of drilling 1/16" holes on the inside of the rim of the t-stat. The holes should generally be equal distance away from each other, probably not vital, but I'd do it that way. 2 holes should also be sufficient for most people.

That'* all I can tell you. I don't have any pics.
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Old 04-27-2006, 12:08 PM   #3
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Actually anything less than a 180 T stat should set a check engine light. And drilling holes is normally done on supercharged to increase the flow ability during boost periods where temps can spike quickly.

You are sure you have a 95 L27 and not a 95 L36? I'm unsure if the vans got the new motor a year after the Bonne or not.
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Old 04-27-2006, 12:11 PM   #4
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yeah the vans kept the L-27 another year, you know, to get rid of all the crap...

thanks guys
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Old 04-27-2006, 12:13 PM   #5
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No Bonnies for 1995 got the L27, If they were Natrually Aspirated they got the L36 NA 3800 Series II motor... The Buick Lesabre and I think Buick Reagal still got the L27 Series I engine... I think the Olds 98 and Buick Park Avenue also got the series II if they were NA'd..

Yes on stock programming go no lower than a 180F T Stat, 160 will be too low..

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Old 04-27-2006, 12:18 PM   #6
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Quote:
Originally Posted by Marik_bathory
yeah the vans kept the L-27 another year, you know, to get rid of all the crap...

thanks guys
Ahh Ok that makes sense..

The TPI 3800 was a good motor and was more than up to the task of moving the transport around...

I guess we should say that some of the H,W and U Body( Minivan ) retained the L27 TPI 3800 for the 1995 Model year where the others went to the new L36...

But with that L27, some TR55'*, An intake, 180 T Stat, may make it feel a bit better...

Also can you look at the RPO list? I think its located behind pannel in the rear of the van... I'm wondering what gear ratio you have with that 3800... I'm thinking 3.06, I know in 96 they were using a 3.29 ratio with the 3400...

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Old 04-27-2006, 12:19 PM   #7
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Quote:
Originally Posted by BillBoost37
You are sure you have a 95 L27 and not a 95 L36? I'm unsure if the vans got the new motor a year after the Bonne or not.
IIRC from another thread, there weren't any Pontiac vans that got the Series 2. I think somebody said that in '96 they switched to a 3.4 or something like that.
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Old 04-27-2006, 12:20 PM   #8
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You live in Florida (Welcome to BC, BTW! ), so it won't hurt you to drill your T'stat. Here'* a pic for you, but this is two 1/8" holes. You might want to go smaller, like 1/16"-3/32". Also, like said, stick with the 180*.

Edit: the pic, courtesy of harofreak00:
Name:  DSC01259.jpg
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Hey, I live in Deltona. I'm like 30 minutes away.
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Old 04-27-2006, 12:23 PM   #9
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lash forgot the pic, then added it later, but here is another angle

http://i33.photobucket.com/albums/d6...2/DSC01251.jpg
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Old 04-27-2006, 12:28 PM   #10
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Note the 2 holes opposite each other...
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