stock 98 thermostat?
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 768
Likes: 6
From: Newport Beach, Southern California
thanx!
After digging the whole night and whole day found out that there are 2 types of stock thermostats that came with C5's because there are 2 types of water pumps installed after 1998. The number on the waterpump should decide what type of thermostat to use. They are NOT interchangeable thank God. The newer kind thermostates have 2 numbers stamped on them 86/100C which translates 186/212F
Thats that mean that it is a 186F thermostat? The old type does not have anything stamped on it.
GM really is not precise on anything so 195 number should be anyones wild guess?
To mention both types have the thermostat built in housing so you buy housing w thermostat.
Can anyone come forward with proof of the stock thermostat for a '98?
After digging the whole night and whole day found out that there are 2 types of stock thermostats that came with C5's because there are 2 types of water pumps installed after 1998. The number on the waterpump should decide what type of thermostat to use. They are NOT interchangeable thank God. The newer kind thermostates have 2 numbers stamped on them 86/100C which translates 186/212F
Thats that mean that it is a 186F thermostat? The old type does not have anything stamped on it.
GM really is not precise on anything so 195 number should be anyones wild guess?
To mention both types have the thermostat built in housing so you buy housing w thermostat.
Can anyone come forward with proof of the stock thermostat for a '98?
Last edited by 2blklt4; Mar 7, 2012 at 05:53 PM.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Those numbers might mean it will start to open at 186 and be fully open at 212.
The older C5 thermostat is not a 195 degree thermostat. It starts to open around 178 give or take. There was another thread where 2 members confirmed this opening temp via testing. It opens enough to start regulating the engine temp when it hits the 190-200 degree range.
In a similar vein, the 160 degree thermostat doesn't run your engine at 160 degrees. It starts to open at 160 degrees. Your engine will run around 175-185 degrees.
These things aren't an open/closed switch. They are a linear device and the amount they open varies with the temperature.
Why do you need the stock temp so badly anyways?
My guess would be that you installed a 160 degree stat. If you installed a 178 degree stat then you'd be running in the 190's on the streets.
Peter
The older C5 thermostat is not a 195 degree thermostat. It starts to open around 178 give or take. There was another thread where 2 members confirmed this opening temp via testing. It opens enough to start regulating the engine temp when it hits the 190-200 degree range.
In a similar vein, the 160 degree thermostat doesn't run your engine at 160 degrees. It starts to open at 160 degrees. Your engine will run around 175-185 degrees.
These things aren't an open/closed switch. They are a linear device and the amount they open varies with the temperature.
Why do you need the stock temp so badly anyways?
Peter
Last edited by lionelhutz; Mar 7, 2012 at 07:09 PM.
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 768
Likes: 6
From: Newport Beach, Southern California
Those numbers might mean it will start to open at 186 and be fully open at 212.
The older C5 thermostat is not a 195 degree thermostat. It starts to open around 178 give or take. There was another thread where 2 members confirmed this opening temp via testing. It opens enough to start regulating the engine temp when it hits the 190-200 degree range.
In a similar vein, the 160 degree thermostat doesn't run your engine at 160 degrees. It starts to open at 160 degrees. Your engine will run around 175-185 degrees.
These things aren't an open/closed switch. They are a linear device and the amount they open varies with the temperature.
Why do you need the stock temp so badly anyways?
My guess would be that you installed a 160 degree stat. If you installed a 178 degree stat then you'd be running in the 190's on the streets.
Peter
The older C5 thermostat is not a 195 degree thermostat. It starts to open around 178 give or take. There was another thread where 2 members confirmed this opening temp via testing. It opens enough to start regulating the engine temp when it hits the 190-200 degree range.
In a similar vein, the 160 degree thermostat doesn't run your engine at 160 degrees. It starts to open at 160 degrees. Your engine will run around 175-185 degrees.
These things aren't an open/closed switch. They are a linear device and the amount they open varies with the temperature.
Why do you need the stock temp so badly anyways?
My guess would be that you installed a 160 degree stat. If you installed a 178 degree stat then you'd be running in the 190's on the streets.
Peter
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
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Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 768
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From: Newport Beach, Southern California
Last edited by 2blklt4; Mar 7, 2012 at 11:40 PM.
Race Director
Joined: Apr 2007
Posts: 11,152
Likes: 890
From: South Western Ontario
Seems high and the increased temps in 6th seem plain wrong. At 60 degrees outside my car would be running low 190's in 6th at any normal highway speed.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
I would suspect the 186* thermo is the SECOND water and pump thermo unit that the car has had and NOT the original euipt When buying a new waterpump they come with a pre-installed thermostat----Ans YES GM did change the configuration of the themostat housing assembly on mewer models---
On my 98 ( a waterpump is normal maintenance) when the waterpmp went out about 4 years ago---i bought a new repalcement for it--The replacement had the NEW style thermo and hosusing and it did come now with a 187*
I bought the car NEW myself off the showroom floor-- from a chevy dealer-
--It had a 195* in it !!!! I did hds cam and mods a year later-- ( I'm an old fart) LOL----
On my 98 ( a waterpump is normal maintenance) when the waterpmp went out about 4 years ago---i bought a new repalcement for it--The replacement had the NEW style thermo and hosusing and it did come now with a 187*
I bought the car NEW myself off the showroom floor-- from a chevy dealer-
--It had a 195* in it !!!! I did hds cam and mods a year later-- ( I'm an old fart) LOL----
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 768
Likes: 6
From: Newport Beach, Southern California
Today road condition and outside temps were the same as yesterday and drove he car at same speed 75mph. makes abslutelly no sense but the new Tstat fixed it.
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 768
Likes: 6
From: Newport Beach, Southern California
thanx!
After digging the whole night and whole day found out that there are 2 types of stock thermostats that came with C5's because there are 2 types of water pumps installed after 1998. The number on the waterpump should decide what type of thermostat to use. They are NOT interchangeable thank God. The newer kind thermostates have 2 numbers stamped on them 86/100C which translates 186/212F
Thats that mean that it is a 186F thermostat? The old type does not have anything stamped on it.
GM really is not precise on anything so 195 number should be anyones wild guess?
To mention both types have the thermostat built in housing so you buy housing w thermostat.
Can anyone come forward with proof of the stock thermostat for a '98?
After digging the whole night and whole day found out that there are 2 types of stock thermostats that came with C5's because there are 2 types of water pumps installed after 1998. The number on the waterpump should decide what type of thermostat to use. They are NOT interchangeable thank God. The newer kind thermostates have 2 numbers stamped on them 86/100C which translates 186/212F
Thats that mean that it is a 186F thermostat? The old type does not have anything stamped on it.
GM really is not precise on anything so 195 number should be anyones wild guess?
To mention both types have the thermostat built in housing so you buy housing w thermostat.
Can anyone come forward with proof of the stock thermostat for a '98?
Still don't know what Tstat the factory instaled waterpumps..I know and saw them that look different and that Tstat does NOT have any numbers engraved on it. Does anyone know?
Tech Contributor
Joined: May 2008
Posts: 3,100
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From: Somers, CT and Clermont, FL
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16
The old style (removable) thermostat is rated at 187*F (86*C) starts to open temperature.
It's listed in the 2001 Owner's Manual on page 6-76.
It's listed in the 2001 Owner's Manual on page 6-76.
