Coolant leak help

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Coolant leak help

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Coolant leak help - 11/7/2008 7:24:03 AM

hummerray

Posts: 10
Joined: 11/7/2008
Status: offline

Hi There,

I am one of only two Hummer H1 owners in South Africa. As you can imagine there are no service centres here and I import all my bits and pieces to do maintenance. Usually the servicing of my vehicle is pretty simple, however, I have had a recent water (coolant) leak that has baffled me. The leak is coming from a pipe that sits inside the blower housing on the passenger side and it drains the coolant tank every time the engine runs! Check the photo. It is not the overflow from the water tank, but rather some sort of overflow for the air-conditioner. The worst of the problem is that I can''t open the plastic housing behind which the suspect pipe sits. I have pulled the pipe inside the vehicle to show the problem. Any ideas?

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RE: Coolant leak help - 11/7/2008 7:32:54 AM

phazer42

Posts: 179
Joined: 4/29/2008
Status: offline

your heater core is inside that "box" if it is cracked you will loose your coolant. If you wanted a temporary fix if you don''t need interior heat just bi-pass the hoses on the outside of them (connect them together). If you have rear heat you should be ok accept for a defrost mode.... Otherwise you need to take the box apart and get at the heater core. Either have yours fixed or replace it...

There is a "new" style HVAC that you could upgrade to that has all of the stuff in it.... it requires some work and some money but many have said that its a much needed improvement.... Kascar sells the equiptment you need (controls, new HVAC unit etc)

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RE: Coolant leak help - 11/7/2008 9:05:52 AM

hummerray

Posts: 10
Joined: 11/7/2008
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Wow. Thanks for the help. Makes sense - now how do I get in to the black plastic housing - I can''t see any mountings, screws or bolts?

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RE: Coolant leak help - 11/7/2008 12:12:18 PM

phazer42

Posts: 179
Joined: 4/29/2008
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remove your blower (the fan) and that would be a good start to be able to see inside the box. I will see if I have an exploded view of the HVAC on the older trucks......

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RE: Coolant leak help - 11/7/2008 8:23:20 PM

hummerray

Posts: 10
Joined: 11/7/2008
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Excellent. Thanks - I will try this today and see if I can get inside. Once again, thank you for your help!

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RE: Coolant leak help - 11/7/2008 11:10:09 PM

3hummers

Posts: 11839
Joined: 9/23/2007
Status: online

Unfortunately the cracked heater core is a common issue. If you run the unit it will drain your coolant. usually you can smell it leaking and frequently it winds up on the passenger side floor board. I bipassed mine as Phazer noted for about 5 months until I replaced the heater core. The bipass works fine unless you need to run the heat/A/C.

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2006 H1 Alpha wagon
2000 H1 Slantback
1997 H1 wagon
2008 H3 Alpha

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RE: Coolant leak help - 11/7/2008 11:17:58 PM

hummerray

Posts: 10
Joined: 11/7/2008
Status: offline

Thanks for the help. Fortunately I won''t need the AC/Heater immediately, so I will do the bypass and replace the AC with a later model later.

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RE: Coolant leak help - 12/2/2008 6:20:55 AM

hummerfamily

Posts: 152
Joined: 11/10/2008
From: Chuck & Kristy
Status: offline

Sounds like you are need of plenty of friends to help supply parts. I was also going to recommend a bypass of some sort. Good louck

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2003 H2
2007 H3

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RE: Coolant leak help - 12/20/2008 3:20:53 AM

hummerray

Posts: 10
Joined: 11/7/2008
Status: offline

Hi Guys,

Sorry, been away on business for some time. Thanks for all the advice - I have successfully stripped the engine bay side to get to the heater core. Will hopefully have some time over the holidays to fix it and get the truck on the road again.

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Post #: 9

RE: Coolant leak help - 1/1/2009 12:37:32 AM

3hummers

Posts: 11839
Joined: 9/23/2007
Status: online

Keep us posted

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2006 H1 Alpha wagon
2000 H1 Slantback
1997 H1 wagon
2008 H3 Alpha

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