Hummer Forums by Elcova  
Forums - Home
Source Decals

Source Motors
Custom. Accessories.

H2 Accessories
H3 Accessories
Other Vehicles

H2 Source

H2 Member Photos
H2 Owners Map
H2 Classifieds
H2 Photo Gallery
SUT Photo Gallery
H2 Details

H2 Club

Chapters
Application

H3 Source

H3 Member Photos
H3 Classifieds
H3 Photo Gallery
H3 Owners Map
H3 Details
H3T Concept

H1 Source

H1 Member Photos
H1 Classifieds
H1 Photo Gallery
H1 Details

General Info

Hummer Dealers
Contact
Advertise

Sponsored Ads
















 


Source Motors - custom. accessories.


Go Back   Hummer Forums by Elcova > Hummer H3 Discussion Forums > Technical Discussion and Customizing your H3

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 10-02-2008, 05:37 AM
Bro Bro is offline
Hummer Veteran
 
Join Date: Nov 2007
Location: Maryland
Posts: 46
Bro is on a distinguished road
Default 07 H3 losing coolant?

Hello All,

I recently had my 2007 H3 in for servicing because I noticed it was losing coolant from the reservoir tank. The tank would go bone dry in about 4-6 weeks of driving the vehicle. The dealer stated they saw no external leakage and I''ve noticed nothing in my home garage or parking spaces at work. They stated through their testing that the coolant isn''t going back into the transmission so they went ahead and replaced the head gasket. It was a hit or miss job they admitted! Well, the truck is still losing coolant and has 29K miles on the odometer. Would the Dex-Cool be evaporating somehow? Or could there possibly be a crack in the head or engine block? There should be external signs of leaking if that was the case, correct? I thought head problems only existed on the 06''s? I have yet to get a check engine light or overheating. On hot summer days the truck did run about 3/4 on the temperature gauge though. Any help would be greatly appreciated!



Thanks
__________________
2007 H3 "Tactical Edition" - Black
Gobi Stealth Rack & Ladder
TrueFlow Intake w/ inlet upgrade
Borla Catback Exhaust
PCMforless Tuned
Bilstein Front & Rear Shocks
Hellwig Rear Anti-Sway Bar
35" Toyo Open Country MT's
____________________________

2005 H2 SUT - Military Green
K&N FIPK Intake
Gibson SS Extreme Exhaust
Predator 87 Octane Tune
20" XD Strike 807 Wheels
35" Toyo Open Country MT's
Reply With Quote
  #2  
Old 10-21-2008, 02:33 AM
07Humvee3 07Humvee3 is offline
Elcova Newbie
 
Join Date: Oct 2008
Location: New Orleans, Louisiana
Posts: 2
07Humvee3 is on a distinguished road
Default Re: 07 H3 losing coolant?

By any chance did you check your engine oil? if there is a crack in the head or engine block, usually water gets into the oil...
Reply With Quote
  #3  
Old 10-23-2008, 11:13 AM
wpage's Avatar
wpage wpage is offline
Hummer Guru
 
Join Date: Jul 2006
Location: Stouts Creek
Posts: 4,192
wpage is on a distinguished road
Default Re: 07 H3 losing coolant?

Had that problem initially with my H3 losing coolant. Started adding straight unmixed coolant (not 50/50 mix) and after a few fills it stopped....
__________________
"For God so loved the world he gave his only son that whoever believe in him would not perish but have everlasting life. "
(John 3:16)
2006 H3 Slate Blue,Header,Jacked,CAI,Toyo35's,HHO.
Priors...
Explorer
Commander
71 Vette
You Name it!
Reply With Quote
  #4  
Old 11-05-2008, 02:24 PM
Bro Bro is offline
Hummer Veteran
 
Join Date: Nov 2007
Location: Maryland
Posts: 46
Bro is on a distinguished road
Default Re: 07 H3 losing coolant?

Well, it was the head gasket on my 07 H3. They replaced it and I am no longer experiencing a loss of coolant. They said it's growing to be an issue on the 07's so keep a look out.
__________________
2007 H3 "Tactical Edition" - Black
Gobi Stealth Rack & Ladder
TrueFlow Intake w/ inlet upgrade
Borla Catback Exhaust
PCMforless Tuned
Bilstein Front & Rear Shocks
Hellwig Rear Anti-Sway Bar
35" Toyo Open Country MT's
____________________________

2005 H2 SUT - Military Green
K&N FIPK Intake
Gibson SS Extreme Exhaust
Predator 87 Octane Tune
20" XD Strike 807 Wheels
35" Toyo Open Country MT's
Reply With Quote
  #5  
Old 11-07-2008, 11:51 PM
pdsq99f4 pdsq99f4 is offline
Hummer Veteran
 
Join Date: Nov 2006
Posts: 172
pdsq99f4 is on a distinguished road
Default Re: 07 H3 losing coolant?

We've seen a few 07's with trans coolers leaking it into the transmissions. It's hard to see it in the trans fluid sometimes unless you put it on white paper.
Reply With Quote
  #6  
Old 07-29-2009, 04:44 AM
Bro Bro is offline
Hummer Veteran
 
Join Date: Nov 2007
Location: Maryland
Posts: 46
Bro is on a distinguished road
Default Re: 07 H3 losing coolant?

Hello,

after they replaced the head gasket, the actual head itself and a few other items. The culprit was my trans cooler leaking internal to the radiator? Does that make sense? So I got a new cylinder head, radiator, coolant flush and overflow tank out of the deal. They replaced the cylinder head after stating cylinder #4 had excessive leak down.
__________________
2007 H3 "Tactical Edition" - Black
Gobi Stealth Rack & Ladder
TrueFlow Intake w/ inlet upgrade
Borla Catback Exhaust
PCMforless Tuned
Bilstein Front & Rear Shocks
Hellwig Rear Anti-Sway Bar
35" Toyo Open Country MT's
____________________________

2005 H2 SUT - Military Green
K&N FIPK Intake
Gibson SS Extreme Exhaust
Predator 87 Octane Tune
20" XD Strike 807 Wheels
35" Toyo Open Country MT's
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 05:56 AM.


Powered by vBulletin Version 3.0.7
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.