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My thermostat had no gasket?

silviaz

By silviaz,
in General Maintenance

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silviaz Experienced

silviaz

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Posted

I just noticed something odd. I went to flush the coolant out of my car and noticed after removing the thermostat to see if additional coolant would come out that there was no gasket, only some gooey rtv sorta stuff but it was rather thin. No rubber surrounding the lip of the thermostat. Is this normal? It's starting to leak also after putting it back lol. Not sure if I should get a rubber gasket considering most cars have this (it's for a subaru as well), or just get some permatex rtv stuff?

My car previously didn't leak at the thermostat.

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https://www.sau.com.au/forums/topic/486011-my-thermostat-had-no-gasket/
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  • 2 weeks later...
Duncan Grand Master

Duncan

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On 27/12/2024 at 11:53 AM, silviaz said:

I'm an idiot, turns out there was a gasket it was just stuck on the block lol. 

But, probably that happened to the last person too, which is why the RTV was there.....if you aren't putting a new gasket in you will need to seal the old gasket back to the metal surface with something, the gaskets will generally only work properly for a single use as they set/harden in that shape

silviaz Experienced

silviaz

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On 1/7/2025 at 4:52 AM, Duncan said:

But, probably that happened to the last person too, which is why the RTV was there.....if you aren't putting a new gasket in you will need to seal the old gasket back to the metal surface with something, the gaskets will generally only work properly for a single use as they set/harden in that shape

Yep I ended up buying a new gasket and no leaks since.

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