Replacing C5 Thermostat?

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Apr 5, 2012 | 08:58 AM

BACNBLK

Thread Starter

Drifting

Joined: Mar 2006

Posts: 1,369

Likes: 79

From: West Coast

Replacing C5 Thermostat?

Bad news is OEM Radiator finally cracked, Great News a brand new DeWitt arrives today!

Besides replacing with all new hoses and coolant, also decided good time for brand new thermostat. Everything brand new!

Question: it appears the T-Stat is a two piece design including stat and water neck housing, ok, more than what is needed but whatever, do I need to use RTV Sealant around the water neck housing, there was only a small rubber washer for around the stat?

What about the larger surface area, am I missing a needed gasket?

Do I use some RTV? Is nothing needed there?

Appreciate any help, thanks!

Apr 5, 2012 | 12:11 PM

machz800ps

Burning Brakes

Joined: Jun 2009

Posts: 787

Likes: 1

From: New Baltimore Michigan

No rtv just use o-ring!!!

Steve

Apr 5, 2012 | 12:12 PM

bumble-z

Le Mans Master

Joined: May 2007

Posts: 5,393

Likes: 17

From: Belleville Mich.

Apply silicone grease to o ring, to hold it in place
Apply anti seize to threads of bolt.
Apply 89 INCH.LB of torque to bolts
Good luck

Apr 5, 2012 | 10:20 PM

BACNBLK

Thread Starter

Drifting

Joined: Mar 2006

Posts: 1,369

Likes: 79

From: West Coast

Thanks guys, seemed like something was missing, will do!

New Radiator showed up today, a day early, I am drooling at getting her done!

Tomorrow night , game on!

Last edited by BACNBLK; Apr 5, 2012 at 10:23 PM.

May 16, 2014 | 02:03 AM

Frankie 69

8th Gear

Joined: Apr 2014

Posts: 8

Likes: 0

My 2002 with LS1 engine has a one piece thermostat/housing unit with an o-ring. The thermostat cannot be separated from the housing and the whole unit must be replaced.

May 16, 2014 | 07:18 AM

vettenuts

Team Owner

Joined: Mar 1999

Posts: 22,025

Likes: 192

From: At the beach in little Rhody

Can you post a photo of the stat you have? Something doesn't sound right and I am wondering if you have the one for the replacement water pump rather than the original water pump.

May 16, 2014 | 09:55 AM

NukeC5

Melting Slicks

Joined: Jun 2012

Posts: 3,163

Likes: 6

From: Oceanside California

Not to start a war, but make sure to use the stock temp thermo, this has been discussed a lot on here.

May 16, 2014 | 05:13 PM

aaronc7

Melting Slicks

Joined: Nov 2013

Posts: 2,049

Likes: 316

From: USA

Quote:

Originally Posted by NukeC5

Not to start a war, but make sure to use the stock temp thermo, this has been discussed a lot on here.

I was so baffled when I first came on the Corvette forums with all talk of going with a cooler tstat for street cars. I would agree that stock is best.... 180F would be fine too.

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May 17, 2014 | 03:29 AM

baxsom

Le Mans Master

Joined: Jun 2008

Posts: 5,284

Likes: 235

From: Rockledge FL

Quote:

Originally Posted by NukeC5

Not to start a war, but make sure to use the stock temp thermo, this has been discussed a lot on here.

That does get discussed around here a lot. I decided that I would go with whatever the company I was paying to build my engine recommended and then didnt even ask.

May 23, 2014 | 02:49 PM

#10

Frankie 69

8th Gear

Joined: Apr 2014

Posts: 8

Likes: 0

Quote:

Originally Posted by vettenuts

Can you post a photo of the stat you have? Something doesn't sound right and I am wondering if you have the one for the replacement water pump rather than the original water pump.

Don't have a photo, but it is my understanding that all C5s (except late 2004s) came with the combined thermostat/inlet housing. If you still have an original water pump with casting #12562459, you have to buy the whole thermostat/inlet housing when replacing the thermostat. But now when you buy a replacement water pump from GM, it is of more conventional style with a replaceable thermostat. Confusing, isn't it.

May 23, 2014 | 03:12 PM

#11

RedZMonte

Burning Brakes

Joined: Dec 2003

Posts: 1,243

Likes: 5

From: Loveland CO

mine is a 04 with a housing and stat as one.. when i ordered the new one they offered separate stat from housing.. they switched at some point.. dont remember when.

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