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Coolant leaking between engine and transmission

Tiny
SAILEE
  • MEMBER
  • 1991 GMC SIERRA
  • 280,000 MILES
My friends truck is leaking coolant where the oil pan is in between the engine and the tranny. I'm lost at why it could be leaking coolant from there instead of oil. I have not done anything to it yet I wanted to ask first for any idea of what it can be.
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Thursday, May 9th, 2013 AT 9:55 AM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Can you tell if coolant is draining down from higher up? Can you get a good look at rear of engine block above the trans? If not it sounds like it is the freeze plug at the rear of the engine.

Here is a guide to help you see what removing the transmission will be like.

https://www.2carpros.com/articles/transmission-replacement-removal-manual

Please let us know what you find.

Cheers, Ken
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Thursday, May 9th, 2013 AT 10:13 AM
Tiny
SAILEE
  • MEMBER
  • 2 POSTS
I think its dripping from up top. No I cant get to the rear of the engine block but do you know if its possible for coolant to be leaking out from back there? Is there a seal back there or something? I will start removing the transmission to replace the freeze plugs if I find nothing else.
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Thursday, May 9th, 2013 AT 3:26 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Please let us know if you need anything else to get the problem fixed.
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Friday, May 10th, 2013 AT 7:33 AM
Tiny
SAILEE
  • MEMBER
  • 2 POSTS
Yep that was the problem, I removed the transmission and there it was leaking away. Thanks again. I love this site
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Wednesday, January 24th, 2018 AT 3:05 PM

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