About two weeks ago I noticed a small puddle of anti freeze on my intake manifold just behind the thermostat housing.
I snugged down the two bolts on the thermostat housing and tightened the upper hose clamp just a turn. It seemed like the problem was solved.
My Vette sat unstarted for a week while I was away on vacation. Today I started it and let it run for 10 minutes. Then I noticed the antifreeze puddle behind the thermostat housing and also along the inboard side of the passenger side valve cover.
I removed the thermostat housing. (It's a chrome one with a round robber gasket on the bottom.) I pulled off the rubber gasket and used a Fel Pro gasket with some sealer on both sides of it. I reinstalled the thermostat housing and kept an eye on it while the motor warmed up. No leaks.
However, after driving the car home I let it sit in the driveway with the hood open to cool down. After about an hour of coolong the darn intifreeze is leaking from between the thermostat housing and the intake manifold.
The swivel necks usually have an "O" ring. You really need to get the proper "O" ring, put a little Vasolene on it to lubricate it, and put everything back together. Boy you're having all kinds of fun lately. The joys of owning a C3!
Vette(s): 1971 Brands Hatch Green L48 Coupe Automatic Driver - restored 1995
DNV, Fireboss and I have all been through the chrome t-stat housing dilema and mine is the only one that has not leaked. There are 4 or 5 of them in my "junk" parts box in my shop. Don't know what it is. It seems as though they should work. We ended up changing both of thiers back to cast.
The "Shark" in the front yard
Corvette is a registered trademark of the General Motors Corporation(GM) &
Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise
noted) and does not claim or imply that Chevrolet or
GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated
with, sponsored or supported by GM. Copyright/trademark/sales mark
infringements are not intended, or implied and are in fact used to support
GM, Chevrolet and Corvette.
Official C3 Vette Registry content is Copyright 2001-2018, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS
Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982