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bigdaddyyukon

bigdaddyyukon

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Hi hope you all are good I haven't post in a while but I have a question some of you might be able to help. I have a 2008 GMC Yukon. 5.3 flex. I have notice that I been having a wet spot on passenger side behind the wheel on the inside. I thought it was oil but it's not. it's antifreeze. I haven't really checked thorough but could the heater core be leaking outside instead of inside ? I checked inside on the carpet nothing, all dry. I know there's hoses that go to the heater core , they don't look like they're wet though this weekend I'm going to check a little bit more thorough . any suggestions on what to look for also? Thank you in advance....
 
HiHoeSilver

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bigdaddyyukon said:
Hi hope you all are good I haven't post in a while but I have a question some of you might be able to help. I have a 2008 GMC Yukon. 5.3 flex. I have notice that I been having a wet spot on passenger side behind the wheel on the inside. I thought it was oil but it's not. it's antifreeze. I haven't really checked thorough but could the heater core be leaking outside instead of inside ? I checked inside on the carpet nothing, all dry. I know there's hoses that go to the heater core , they don't look like they're wet though this weekend I'm going to check a little bit more thorough . any suggestions on what to look for also? Thank you in advance....
Click to expand...

Yes, it could be the core. Check the T fittings at the firewall first.
20180920_231432.jpg
 
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bigdaddyyukon

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Yes , I had looked at them hoses initially and seen nothing but I will definitely check again this weekend. Now, if they are not leaking, how and were would the core be leaking outside if it's inside of the truck. I mean I've known for them to leak inside the vehicle and make a mess of the rug but again, I checked the rug and it's pretty dry. Thank you again
 
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bigdaddyyukon

bigdaddyyukon

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kbuskill said:
It could potentially leak out at the A/C drain location. The heater core and A/C evaporator share the same housing.
Click to expand...

Gotcha, so it don't necessarily have to leak inside? It could be leaking out that tube and still be the heater core? I take it, it's very costly to replace on these trucks..
 
Rocket Man

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Are you sure it’s antifreeze? It sure looks like AC condensation dripping. That’s right where it drips.
 
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Agree with @Rocket Man. Does your rear AC work? If not, may be freon leak. Smell it, if it smells sweet, its antifreeze. But looks like condensation from the drain.
 
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bigdaddyyukon

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Rocket Man said:
Are you sure it’s antifreeze? It sure looks like AC condensation dripping. That’s right where it drips.
Click to expand...

I'm going to put a catch pan under it tonight. Just to make sure. I am using red antifreeze so I'll be able to be sure. I somewhat smell it on the outside of the truck.. I'll be turning on the heater to see if I smell it through the vents...I'm so hoping its not the core but my luck hasn't been too good lately...lol
 
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