Help finding leak

Tiny
IANOBETZ
  • MEMBER
  • 1998 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
I'm trying to find a coolant leak in my 1998 Chevy S-10. The leak turned heavy over the last week. The leak is coming from the middle of the engine compartment, dripping off the transmission. I bypassed the heater core by splicing the hoses coming out of the water pump and the leak continued. I can't see under the engine or into the engine compartment toward the back of the engine. How can I determine where the leak is coming from?
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Sunday, November 28th, 2010 AT 11:36 PM

9 Replies

Tiny
RASMATAZ
  • MEMBER
Could be an intake manifold leak or a freeze plug blown between the engine and transmission-
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Sunday, November 28th, 2010 AT 11:42 PM
Tiny
IANOBETZ
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I'll ask in a more clear fashion: How can I determine where the leak is coming from?
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Sunday, November 28th, 2010 AT 11:46 PM
Tiny
RASMATAZ
  • MEMBER
Pressure test the cooling system and closely look towards the back of the engine and front-you're eyes and ears here-could be the cylinder head etc-let me know
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Sunday, November 28th, 2010 AT 11:51 PM
Tiny
IANOBETZ
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I can re-create the leak by turning on the engine. The problem is I can't see that far into the engine. I imagine I won't be able to see the freeze plug between the engine and transmission when its leaking. But is there a way I can eliminate other leaks, like the intake manifold? It doesn't sound like much fun if I have to pull the engine for the freeze plug.
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Monday, November 29th, 2010 AT 12:07 AM
Tiny
RASMATAZ
  • MEMBER
You have an external leak-you should be able to see it which I'm unable to-If the leak is on a freeze plug behind the engine it will leak between the engine and tranny at the bottom where the tranny meets the engine-confirm it-go underneath and observe-
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Monday, November 29th, 2010 AT 1:19 AM
Tiny
IANOBETZ
  • MEMBER
It appears to be leaking from between the engine and the transmission, but I also see quit a bit of moisture where the intake manifold sits on the head, although I don't see the leak itself.

Background: I've been plagued with coolant problems for the last 6 months or more. I've replaced the radiator and have been adding a lot of coolant. The engine wasn't leaking on the ground or driveway but I had to ad coolant. I've also changed the thermostat. 3 weeks ago I finally gave in and added Barrs Stop Leaks.
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Monday, November 29th, 2010 AT 2:58 AM
Tiny
RASMATAZ
  • MEMBER
Try tightening down the intake manifold and see what happens-
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Monday, November 29th, 2010 AT 3:03 AM
Tiny
IANOBETZ
  • MEMBER
I found a small puddle of coolant underneath the intake hose (that goes to the filter) that I couldn't see until I removed it. I attempted to make the leak happen again, but for some reason (maybe cold tonight) it didn't leak. I'm going to head to Autozone tomorrow to use their pressure tester to see if I can see where the leak is coming from. I'll try tightening the bolts if I still can't find it with pressure.
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Monday, November 29th, 2010 AT 5:37 AM
Tiny
IANOBETZ
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Sure enough, added pressure, found the leaks all around the intake manifold. I replaced all of the upper gaskets. I'm almost done with the project, but having one final problem. I have one left over terminal where I can't find the port. I have attached an image of the terminal. The wire is black/yellow.
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Tuesday, November 30th, 2010 AT 11:37 PM

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