# 93 gmc yukon

**URL:** <https://community.cartalk.com/t/93-gmc-yukon/29060>\
**Category:** Maintenance/Repairs\
**Created:** [April 13, 2009, 12:44am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060 "2009-04-13T00:44:30Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![denise\_w](https://avatars.discourse-cdn.com/v4/letter/d/87869e/32.png) [@denise\_w](https://community.cartalk.com/u/denise_w)\
**Post date:** [April 13, 2009, 12:44am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060/1 "2009-04-13T00:44:30Z")

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my yukon is making a thumping noise when i first turn the engine on (about 12 to 20) thumps,and then again when i shut the engine off.there is also a oily leak coming from under the dash on the passenger side, have any ideas?

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**Author:** ![wizard](https://avatars.discourse-cdn.com/v4/letter/w/a87d85/32.png) [@wizard](https://community.cartalk.com/u/wizard)\
**Post date:** [April 13, 2009, 1:18am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060/2 "2009-04-13T01:18:30Z")

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Maybe engine and transmission mounts for the thumping, the oily leak could be coolant coming from the heater core. The oily substance could be anti-freeze.

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [April 13, 2009, 6:20am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060/3 "2009-04-13T06:20:38Z")

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You may also want to take a look if the exhaust system is secure. They made a Yukon in 93?. Do you have AC? the oily stuff could be AC oil from a leaking evaporator. I have never seen this though. I can’t even picture a 93 yukon.

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**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\
**Post date:** [April 14, 2009, 2:20am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060/4 "2009-04-14T02:20:34Z")

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Yep. Check it out on here on the car research link. Right back to '92.

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**Author:** ![denise\_w](https://avatars.discourse-cdn.com/v4/letter/d/87869e/32.png) [@denise\_w](https://community.cartalk.com/u/denise_w)\
**Post date:** [April 16, 2009, 12:44am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060/5 "2009-04-16T00:44:41Z")

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Thanks for the input!Figured it was the heater core, but didn’t know what was making the thumping noise.  
I will have it checked out this wknd. I do appreciate you guys tremendously.  
Thanks again  
Denise

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**Author:** ![denise\_w](https://avatars.discourse-cdn.com/v4/letter/d/87869e/32.png) [@denise\_w](https://community.cartalk.com/u/denise_w)\
**Post date:** [April 16, 2009, 12:49am UTC](https://community.cartalk.com/t/93-gmc-yukon/29060/6 "2009-04-16T00:49:53Z")

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Going to have the truck looked at this wknd.  
Yeah a 93 2door yukon. They are great looking trucks! Check 1 out.  
Thanks for your reply so quickly!  
Denise