Coolant leak

Asked by Sep 22, 2017 at 10:34 AM about the 2004 Chevrolet Suburban 1500

Question type: Maintenance & Repair

I have a coolant leak that wasn't a hose, as they looked to be in good shape.  
I replaced the water pump and refilled.  Drove around, no problem, no leak
under it after we parked.  Came back this morning and there was coolant all
under the truck.  Could it be the bottom hose (which looked a little swollen),
or the expansion tank?

This only happens when the truck is parked and off, or at a very, very long
idle (hour or so because the wife had it at idle for 20 minutes picking up the
kids from school and this did not happen).

7 Answers

65

which side and where. is it under passenger side front? under oil tank? little more info please

That's the thing, I can't pinpoint where it's coming from. It is definitely under the passenger side front somewhere.

65

check under the carpet on the passenger side? just pull it back and see if it is wet anywhere? that would be a heater core if it is but also look at the connections going into the fire wall on passenger side. do you notice your windshield you having to defrost it more?

I'll check the firewall, but inside is dry and we have never needed to run the defroster except in deep winter (Louisiana here).

65

ok, i am hoping it is not one your freeze plugs on side of motor. one thing you can do is rent a coolant pressure tester from autozone, they give the money back so its basically free. hopefully you will here and see it leaking after you put it under pressure

Thanks for your help, Luvmychevy! I HAD to drive to Dallas today, keeping an eye on the temp gauge the whole way. Made 3 stops with no leaking or temp increase. Got to Dallas and let the truck rest for an hour and came back to dry concrete! I think I overfilled the expansion tank last night after switching the water pump. It's the only thing I can figure. I put almost 4 gallons of fluids.

65

no prob, i can only suggest problems to look for. its hard when you do not have the vehicle to look at and inspect myself. glad it all worked out. holler if you have any more questions!

Your Answer

Suburban

Looking for a Used Suburban in your area?

CarGurus has 544 nationwide Suburban listings starting at $2,871.

Postal Code:

Chevrolet Suburban Experts

  • #1
    Andrew Olsen
    Reputation
    1,060
  • #2
    Neal Turner
    Reputation
    980
  • #3
    Eric Fritz
    Reputation
    940
View All

Related Models For Sale

Used GMC Yukon XL
13 Great Deals out of 684 listings starting at $4,499
Used Chevrolet Tahoe
755 listings starting at $3,995
Used GMC Yukon
7 Great Deals out of 865 listings starting at $6,700
Used Ford Expedition
20 Great Deals out of 384 listings starting at $5,490
Used Cadillac Escalade ESV
212 listings starting at $11,900
Used Cadillac Escalade
4 Great Deals out of 470 listings starting at $8,999
Used Chevrolet Silverado 1500
196 Great Deals out of 10,133 listings starting at $1,779
Used Chevrolet Silverado 2500HD
21 Great Deals out of 1,273 listings starting at $4,995
Used Ford F-150
654 Great Deals out of 10,001 listings starting at $2,900
Used Toyota Sequoia
11 Great Deals out of 94 listings starting at $3,200
Used GMC Sierra 1500
252 Great Deals out of 10,419 listings starting at $1,775
Used Lincoln Navigator
63 listings starting at $2,888
Used Nissan Armada
154 listings starting at $12,900
Used Ford Explorer
20 Great Deals out of 1,606 listings starting at $4,500

Used Cars For Sale

2017 Chevrolet Suburban For Sale
132 listings starting at $47,894
2016 Chevrolet Suburban For Sale
41 listings starting at $42,900
2015 Chevrolet Suburban For Sale
29 listings starting at $40,995
2014 Chevrolet Suburban For Sale
9 listings starting at $29,607
2013 Chevrolet Suburban For Sale
16 listings starting at $27,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.