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post #1 of (permalink) Old 01-26-2003, 03:18 PM
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thermestat housing leak

This is the deal, I have noticed a small leak from around my thermestat houseing. I replaced the gasket and new therm. I looked the next day and still saw an felt a wet spot and the bottom of the therm. housing. SO then I decided to just replace the entire housing, and the [img]images/graemlins/cussing.gif[/img] thing is still leaking. I have a new gasket a new therm and a new housing. I know for sure that its leaking from there. What else can I try to do to stop the thing from leaking around the therm housing?

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post #2 of (permalink) Old 01-26-2003, 03:26 PM
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Re: thermestat housing leak

What engine do you have and did you clean the mating surface on the intake/head (depending on motor) real good?
If its a V-8, is the aluminum manifold gasket parting surface badly corroded and what type of sealant did you use? Did you give the sealant time to cure before adding coolant to the radiator?
just a few things that came to mind...
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post #3 of (permalink) Old 01-26-2003, 04:04 PM
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Re: thermestat housing leak

are you sure it's not leaking from the big radiator hose and running down the housing to the gasket? i just put a new tstat in mine and noticed a coolant leak from what appeared to be the gasket, but knowing my badass RTV skills i figured it was the hose, and when i ran my finger under there where the hose ends it was wet, which could only have come from the hose. it IS over 3 years old, maybe time to put on a new hose? [img]images/graemlins/blush.gif[/img] [img]images/graemlins/grin.gif[/img]
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post #4 of (permalink) Old 01-26-2003, 04:39 PM
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Re: thermestat housing leak

Well this winter has given me some bad luck. About a month ago my radiator started to leak from a hair line crack. So when I dropped in a new radiator I went a head and changed the upper and lower hoses also. I checked them and they are on nice n tight. I also cleaned the surface of the Therm housing nice and good, but it looks like I may have to do it a third time and maybe that can work. And its a 302 im working on so the therm housing is right up front and pretty easy to get to considering others I've seen. [img]images/graemlins/givemebeer.gif[/img]
post #5 of (permalink) Old 01-26-2003, 05:34 PM
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Re: thermestat housing leak

where are you getting the gaskets? i noticed that O'Reilly's gasket is not a very good fit, whereas AutoZone's seems to be perfect. That O'Reilly one was so bad that I didnt use it, I used RTV soley and it worked fine. I've done that on several occasions, and it seems to work as well as anything, just go easy on the bolts so that you dont squeeze it all out. One other thing to notice is that coolant will pool right behind the gasket area inside the engine, and if you're leaning on the core support that coolant will spill over and get the sealing surface wet. It will NOT seal if this happens while you're reattaching the outlet housing! Been there, done that. I get in there with some shop towels and wick it up before I seal it back up, that way there's no chance of ruining my seal. good luck.
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post #6 of (permalink) Old 01-27-2003, 08:33 AM
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Re: thermestat housing leak

Aerosol Cop-R-Kote gasket prep also helps, even on hose connections.
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post #7 of (permalink) Old 01-27-2003, 12:12 PM
 
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Re: thermestat housing leak

Mine is leaking in the same spot, has been for a month or so. In addition to a good gasket, I bought a small tube of sealant this is espcially for T-stat housing.
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post #8 of (permalink) Old 01-27-2003, 03:40 PM
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Re: thermestat housing leak

The timing cover can also spring a leak just underneath the thermostat housing as well. [img]images/graemlins/frown.gif[/img]
Is the coolant "pooling" in the low spot on the cover just underneath the thermostat housing?
Dry everything off, and run the engine while parked.
See if you can tell where it gets wet first.
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