420A Thermostat housing leak

[Tribal_RS_96]

Just checking if this actually causes vacuum and power issues. Just noticed it was leaking today, probably from the bad handmade gasket job. No leaks from anywhere else though.

 

[96' Eclipse GS]

If you are talking about the first or second half of the thermostat housing that the upper radiator hose is connected too. Then, no, more than anything, if you do have a leak then you will have air in the cooling system that may cause later overheating problems.

 

[Tribal_RS_96]

I was talking about the first half that connects to the head.

 

[Talon IV]

You still should not have any vacuum issues as it only pertaines to the cooling system. Again you may get air in there that could cause over heating issues but vacuum or power loss would be a whole different issue.

 

[Tribal_RS_96]

Just checking, I haven't driven it since I found it the other day, I'm waiting on the gasket to come in.

 

[JamesH3]

Shouldn't cause any ill effects on drivability

 

[Dhan]

As stated above, there's no vaccum to be lost at the thermostat housing. However, you could lose pressure in the coolant system which would lower your boiling point which would be bad.

I see you ordered a gasket already, but in the future, you can use those DIY gasket sheets that come in three packs from NAPA or Advance and cut out your own with a razor.

I also like to use a thin film of sealer to get things as close to leak-proof as possible. Gasgacinch is my favorite. The red Permatex stuff works too, but it gets messy really quick.

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[Stmguy42]

i would not use any form of gasket sealer, nothing beats a new gasket. they are only a few dollars. my suggestion would be to drain all coolant from the car take off the t-stat housing replace all gaskets buy a new t-stat , re fill and "burp" the system (meaning free all air from the coolant lines)