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Location of engine/firewall A/C drain

Tiny
LOYALSOLDIER
  • MEMBER
  • 2008 GMC ACADIA
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Getting water in front passenger floor when running A/C. Hear s sloshing sound when turning the water comes down. Have made sure the hose and drain plug behind drivers side floor panel next to gas paddle is clear. No water from tube and water flows freely down through that plug.

Seen videos and articles on GM vehicles having a drain pipe/tube in engine compartment next to firewall that could be plugged, but am unable to find it. Have tried looking behind engine from top and under it. Anyone know where this is at exactly?
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Sunday, April 7th, 2019 AT 3:07 PM

21 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The actual drain is under the dash and is connected with a hose that goes through the firewall.

I attached a picture for you to view and the procedure for accessing it.

Roy
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Sunday, April 7th, 2019 AT 3:50 PM
Tiny
LOYALSOLDIER
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Hi Roy. Yes, have found that already. And verified water drains out the plug. Getting water on passenger side from the blower area. Shouldn't there be another drain to check?

Example video:
https://youtu.be/XZ8M4KN9MIY
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Sunday, April 7th, 2019 AT 3:58 PM
Tiny
ASEMASTER6371
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No, there is only one drain.

Is it draining to the outside on the floor? If it is, make sure it is coming out fast enough. It may be partially clogged.

If it is not then the hose is clogged with debris.

Roy
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Sunday, April 7th, 2019 AT 4:05 PM
Tiny
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  • 11 POSTS
Okay, I'll double check.
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Sunday, April 7th, 2019 AT 5:35 PM
Tiny
ASEMASTER6371
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Keep us updated.

Roy
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Sunday, April 7th, 2019 AT 7:32 PM
Tiny
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Took hose out and verified it is not clogged at all. Leaks still happen.
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Sunday, May 26th, 2019 AT 3:05 PM
Tiny
ASEMASTER6371
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Is it clear water or coolant?

Roy
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Sunday, May 26th, 2019 AT 4:16 PM
Tiny
LOYALSOLDIER
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Clear water.
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Sunday, May 26th, 2019 AT 4:34 PM
Tiny
ASEMASTER6371
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Okay, then remove the hose again and you will need to probe into the EVAP case. The clog is most likely in the heater case.

Roy
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Sunday, May 26th, 2019 AT 4:57 PM
Tiny
LOYALSOLDIER
  • MEMBER
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What's safe to use so I don't damage something?
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Sunday, May 26th, 2019 AT 5:23 PM
Tiny
ASEMASTER6371
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A coat hanger. Just be careful and move it around inside to dislodge the debris. If you have compressed air, use it after you loosen the dirt to get it to move and flush out the dirt.

By your name, are you military?

Roy
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Sunday, May 26th, 2019 AT 5:27 PM
Tiny
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Okay, will try that.

Former Air Force.
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Sunday, May 26th, 2019 AT 5:44 PM
Tiny
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Thank you for your service.

Hoo Rah.

Roy
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Sunday, May 26th, 2019 AT 6:13 PM
Tiny
LOYALSOLDIER
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Thanks for your support.
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Sunday, May 26th, 2019 AT 6:24 PM
Tiny
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Proud to have served.

Roy
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Sunday, May 26th, 2019 AT 6:31 PM
Tiny
LOYALSOLDIER
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Branch?
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Sunday, May 26th, 2019 AT 6:38 PM
Tiny
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Vietnam, Marine. Bad time. Memory is pretty bad from those days. Want to forget all that happened.

Roy
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Sunday, May 26th, 2019 AT 6:43 PM
Tiny
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Thanks for your service. Sorry for that bad experience. Will be praying for you.
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Sunday, May 26th, 2019 AT 7:04 PM
Tiny
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Thanks. Seeing all that and living through it scars your head.

Roy
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Sunday, May 26th, 2019 AT 7:06 PM
Tiny
LOYALSOLDIER
  • MEMBER
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Think I got it. Coat hanger allowed water to come out. Ran the A/C and so far so good. Thanks for your help.
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Monday, May 27th, 2019 AT 2:39 PM

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