Coolant leak

Tiny
IKE13
  • MEMBER
  • 2001 SATURN SC1
  • 1.9L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
I discovered a large crack developing below where my thermostat sits. Causing my coolant system to leak. I started to notice it leaking when I flushed the coolant system. It appears to be attached along with the water pump to the engine block. Is it possible to remove the whole unit or is it built into the engine. Also what is the best way to fix a crack in what appears to be aluminum?
Monday, December 2nd, 2019 AT 5:09 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 POSTS
Hi,

Is it possible for you to upload a picture where the leak is located? I will be able to tell if it is a replaceable part or if something needs repaired.

I attached a pic of the pump, can you tell approximately where it is coming from on the pic?

Let me know.
Joe
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Monday, December 2nd, 2019 AT 8:05 PM
Tiny
IKE13
  • MEMBER
  • 12 POSTS
It’s just below the thermostat housing on the right hand side. Right above where the bolt is to drain the thermostat area.
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Monday, December 2nd, 2019 AT 10:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 POSTS
Hi,

First, I attached two pics. The first has three areas numbered. The second is highlighted.

There are really one of three places it can be leaking, the thermostat housing, the drain, or the engine block is cracked. Take a look at the attached pic and let me know if number 3 is where you see a leak. Is the highlighted area where you see coolant? If so, reconfirm the t-stat housing isn't leaking down. If it is the actual engine block that is cracked, you will need to have it welded. When welding aluminum, a TIG welder is used.

The timing chain cover is there as well as the water pump. There is no coolant running through the cover. If at all possible, take a pic of your vehicle. I need to see exactly where you are referring to be sure. Also, is there any chance there was water in the system and it froze?

Joe
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Tuesday, December 3rd, 2019 AT 6:26 PM
Tiny
IKE13
  • MEMBER
  • 12 POSTS
It definitely is the area you marked 3. The crack looks like it starts from the housing and stretches 6in across into the engine block. Your option to weld it was my first thought as well. Thank you for your time.
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Tuesday, December 3rd, 2019 AT 9:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,068 POSTS
Hi,

Yes, if it is the block, and I believe it is, that is really the only option. That area will be pressurized by the cooling system. Since it is aluminum, it will require tig welding.

Let me know if I can help.

Take care,
Joe
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Wednesday, December 4th, 2019 AT 6:29 PM

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