Water leaking into spare tire area - TerrainForum.net: GMC Terrain Forum
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post #1 of 11 (permalink) Old 03-11-2018, 07:19 PM Thread Starter
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Question Water leaking into spare tire area

I have a 2010 Terrain with water leaking into the spare tire compartment when it rains. I've read the post to just get it water checked to find the leak from one of the 8+ places it could be leaking in from. My question is....has anyone just drilled a hole in the bottom of the spare tire compartment to let the water just drain out like that? AND is there any chance the fuel tank or fuel lines be damaged by doing that? (either punturing or from semi-constant water contact)

2010 GMC Terrain SLE (V6)
Castrol Magnatec (5W-30) + Mobil 1 Oil Filter
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post #2 of 11 (permalink) Old 03-11-2018, 07:41 PM
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Originally Posted by ceehow217 View Post
I have a 2010 Terrain with water leaking into the spare tire compartment when it rains. I've read the post to just get it water checked to find the leak from one of the 8+ places it could be leaking in from. My question is....has anyone just drilled a hole in the bottom of the spare tire compartment to let the water just drain out like that? AND is there any chance the fuel tank or fuel lines be damaged by doing that? (either punturing or from semi-constant water contact)


Have not drilled a hold in spare tire well to allow water to drain. Over the years, I have experienced water leaks on several vehicles (but not a Terrain).

You do run the risk of damaging a fuel tank, fuel line, evaporate line, wiring harness, etc. Exhaust fumes could enter the hole, such as while youíre stopped with the engine running. If you donít stop the source of the water, you run the risk of mold and mildew, and respiratory issues.
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post #3 of 11 (permalink) Old 03-11-2018, 08:26 PM
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Donít know how nimble or flexible you are, but if I had this problem Iíd be clearing house in the back and then sitting there while someone sprayed a garden hose from an elevated position (simulating rainfall). And Iíd do it in sections, not like I was washing the whole car at once - otherwise you wonít be sure where the leak is coming from. It may not leak immediately. There may be a delay while something fills up first. So stay in one spot, soak, then wait and listen. Then repeat.

Itís either the back windows or the liftgate window or seal, or the tail lights.

Drilling a hole is a bad idea, but have you even looked yet? There might already be a hole there with a rubber plug. Seems to me Iíve seen this before in one of my old liftgate areas.

2011 Equinox 1LT (new Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 138.2k miles [05-NOV-2019]

2002 Impala 1LT (new Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /225.5k miles [05-NOV-2019]

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post #4 of 11 (permalink) Old 03-11-2018, 09:32 PM
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I think there is a rubber plug in the spare tire well to run the wires for trailer lights. Remove the plug and no damage to gas tank or lines. It can replaced if you want.
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post #5 of 11 (permalink) Old 03-14-2018, 12:30 PM Thread Starter
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Thanks for the input guys. I'll try a few of these suggestions out starting with looking for the rubber plug.

2010 GMC Terrain SLE (V6)
Castrol Magnatec (5W-30) + Mobil 1 Oil Filter
Sylvania SilverStar low & high beams
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post #6 of 11 (permalink) Old 02-09-2019, 01:05 PM
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I have this exact problem (and it's been raining a lot lately). Have you figured anything out? I also read somewhere that the sunroof drain hose can get clogged and drain into this area.
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post #7 of 11 (permalink) Old 03-12-2019, 12:29 AM Thread Starter
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Originally Posted by SoCalMike View Post
I have this exact problem (and it's been raining a lot lately). Have you figured anything out? I also read somewhere that the sunroof drain hose can get clogged and drain into this area.
I ended up taking my Terrain to my normal independent shop. He said there were two factory cut holes along the pillars of the rear hatch that had some type of tape (like a thicker duct tape) over them that had deteriorated. He said he put a new patch and seal over the holes. It seems to have stopped the water getting in for my case. Honestly I think you'll have to just take it somewhere and have them run their water test to find the leak. My mechanic had my truck for 2 days hunting down the leak. He had to take interior panels off to find out where the water was leaking from.

2010 GMC Terrain SLE (V6)
Castrol Magnatec (5W-30) + Mobil 1 Oil Filter
Sylvania SilverStar low & high beams
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post #8 of 11 (permalink) Old 03-12-2019, 12:58 PM
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recently was airing up the tires.
Removed the rear cover to check the donut spare.
I found moisture/condensation on the top part of the tires rim.... OH OH....
Thinking there was a puddle of water. I removed everything and checked back there.... All dry. No leak from anywhere.
Most likely condensation from the hot/cold/ rain we had.

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post #9 of 11 (permalink) Old 03-12-2019, 04:57 PM
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Most likely condensation from the hot/cold/ rain we had.

If you want to get rid of that problem permanently, you might want to consider moving to the Great Northeast. We don't get any "hot/cold? rain here, all of ours is cold, and often it is white and floats gently down to the ground ! I know, I am jealous of you ! When we go to check the spare tire well for moisture, it usually doesn't even have a tire in it, because it has rusted out from all of the salt on the roads. Another "feature" of living in the GNE is that we don't have to buy table salt - we can just sweep if off of the ground, or brush it off of our cars, and clothes !



Wow, I never knew the many "advantages" of living in the GNE !

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post #10 of 11 (permalink) Old 10-21-2019, 07:25 PM
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I have a 2018 SLT Diesel Terrain with the same problem. The water built up in the spare tire compartment to the point that the water flowed into the rear passenger floor. That's when I noticed the water problem, by hearing the water splashing around. I went outside while it was raining and found water droplets near the aft right rear vent by the hatch (See Pictures). The vehicle is at the dealer and I am waiting on their finding.

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