Thermostat - 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.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-25-2004, 02:46 PM   #1
Senior Member
True Car Nut
Thread Starter
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default Thermostat

Anyone got pics of how they drilled their t-stat? I need to get my car running cooler and don't really wanna buy a new tstat when this one is new.


Thanks Nate
LakevilleSSEi is offline   Reply With Quote
Old 09-25-2004, 03:09 PM   #2
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

you uhhh.. drill a hole in it.


-justin
opensourceguy is offline   Reply With Quote
Old 09-25-2004, 03:14 PM   #3
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default



Don't do four. That'* summertime hot-climate stuff. Drill two 1/16" diameter holes across from each other, so the rubber seal won't overlap them. De-burr with a larger drill bit, top and bottom, and rinse well before install.

These are 1/8" holes. This is HOT DRAGSTRIP thermostat material. Your holes need to be smaller.
willwren is offline   Reply With Quote
Old 09-25-2004, 03:31 PM   #4
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

That was a much better explination than mine.


-justin
opensourceguy is offline   Reply With Quote
Old 09-25-2004, 10:55 PM   #5
Senior Member
Posts like a Turbo
 
Join Date: Apr 2004
Location: Sheridan Wyoming
Posts: 210
Thanks: 0
Thanked 0 Times in 0 Posts
57chevythunder is on a distinguished road
Default

Anyone care to expound their theory on what the holes are supposed to do?
57chevythunder is offline   Reply With Quote
Old 09-25-2004, 11:28 PM   #6
Senior Member
True Car Nut
 
Join Date: Apr 2004
Location: Three Oaks, Michigan
Posts: 4,879
Thanks: 0
Thanked 0 Times in 0 Posts
opensourceguy is on a distinguished road
Default

uhh.. let coolant through. It helps to keep the temps down in warming of the engine, taking slightly longer to get up to temp when cold. However, I believe it also lets more coolant through once the tstat opens up, allowing for better cooling.


-justin
opensourceguy is offline   Reply With Quote
Old 09-26-2004, 12:22 AM   #7
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

The holes allow for a slower warmup, helping to prevent initial heatsoak. It also allows more to pass when the therm is open as well, but not much.
willwren is offline   Reply With Quote
Old 09-27-2004, 10:29 AM   #8
Senior Member
True Car Nut
Thread Starter
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

Thanks for the info guys. How much of a difference does drilling the t stat make vs buying a 180 or 165 t stat? Are the holes worth 15 bucks?



Thanks,

Nate
LakevilleSSEi is offline   Reply With Quote
Old 09-27-2004, 10:54 AM   #9
Senior Member
Posts like a Turbo
 
Join Date: Aug 2003
Location: Ashland, Ohio
Posts: 423
Thanks: 0
Thanked 0 Times in 0 Posts
jgs11 is on a distinguished road
Default

the drilled theremostat also helps prevent hot spots in your heads. if you plan on doing a pulley on your car then get a 180* thermostat. they cost like $6-$7 at advanced auto and drill it yourself like the picture that willwren put up. this is an easy do it yourself job
jgs11 is offline   Reply With Quote
Old 09-27-2004, 12:06 PM   #10
Junior Member
Posts like a Ricer Type-R
 
Join Date: Jun 2004
Location: SW Ohio
Posts: 15
Thanks: 0
Thanked 0 Times in 0 Posts
95guy is on a distinguished road
Default

The aspect that some forget is this:

Until the thermostat opens, the coolant in the engine near the thermostat isnt moving. Convection (hot rising, cool falling) means that the coolant right around the thermostat must pick up to AT LEAST (and then well past) the thermostat opening point before it reacts by opening. By the time it opens, the coolant is over that rated temperature - meaning it has to play "catch up". For proof - next time you jump in the car with the engine cold and then get it up to operating temperature, you'll see the thermostat open (late, higher than its rated temp), then the coolant temp falls down below its rated temp, then it swings back higher again and finally settles on its happy place. It doesnt seem to matter whether its a standard stant or Robertshaw type, they all seem to do it.

Drilling a hole in it does marginally lower the temperature rating, but it allows coolant to flow past the thermostat and allow it to react to cold-start warmups without the temperature swings. I've never drilled one and not been happy with the way it operated. I can't say the same for ones straight out of the box.

Older thermostats (ones that were made up into the 80s) had a small passange made into them for this purpose, but its not there anymore from my checking.


My opinion is that thermostats are trying to establish a miminum operating temp for the engine rather than trying to regulate a maximum temperature.
95guy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Thermostat Seal and Thermostat Housing Gasket MACDRIVE 2000-2005 14 10-23-2006 05:35 PM
180 degree thermostat Delirious0413 1992-1999 22 02-06-2003 04:03 AM
Im a little confused (180 thermostat) kimmers 1992-1999 15 12-13-2002 12:25 PM
Thermostat for LeSabre? 93LeSabre Buick 1 11-30-2002 04:28 PM
Thermostat fly89gta 1992-1999 5 11-29-2002 02:23 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:18 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.