Coolant leak

CHARLESTUCK

MEMBER
2010 CADILLAC DEVILLE DTS
88,500 MILES

Coolant leak at the engine end of the top radiator hose. It is leaking at the bolt to the left. See the photo.

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Monday, April 22nd, 2019 AT 6:46 AM

4 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

Did you try tightening the bolt? Sometimes a bolt, like the one in your picture (thank you by the way) will back off slightly, just enough to allow a minor leak, like the one in your picture. Try it and get back to us with what you are able to find out, please.

Thanks,
Alex
2CarPros.

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Monday, April 22nd, 2019 AT 8:23 AM

CHARLESTUCK

MEMBER
59 POSTS

I tried to tighten it and couldn't tighten it any more. Is there a copper washer or seal in/under there? Could that part be cracked? What is that called?

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Monday, April 22nd, 2019 AT 8:57 AM

CHARLESTUCK

MEMBER
59 POSTS

What is the name of that part where that bolt is?

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Monday, April 22nd, 2019 AT 8:59 AM

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello again,

I believe that is going to be your thermostat housing. There should be an O-Ring gasket in there that might have failed. I have included some diagrams for you in the diagrams down below. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros

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