Anybody replaced heater hoses? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 04-29-2010, 04:48 PM
OldSVTGuy OldSVTGuy is offline
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2004 Chevy TrailBlazer LT
Sand Beige Metallic 4.2L I6 4X4
Join Date: Mar 2008
Location: Dryfork, WV
Posts: 37
Anybody replaced heater hoses?

I'm starting some major maintenance on the 04 TB (105,000 miles). Just did spark plugs and cleaning the throttoe body - not as dirty as I thought it would be. The next step will be to replace coolant, radiator and heater hoses (I don't replace thermostats unless they need replaced). I've traced the heater hoses from the core - one goes into the passenger side of the block and the other goes down and attaches to the metal tube that goes behind the transmission. Both look fairly easy - the one that connects to the metal tube can be reached through the wheel well. However, the one that connects from the metal tube into the front of the block near the lower radiator hose looks a bit cramped for space. The rubber heater hoses are available at rockauto.com as well as the quick disconnects. I've searched the forum but have not found anyone that has replaced the heater hoses.

The 4WD disconnect and shocks/struts will also be done this summer - thanks for the great write-ups on these repairs.

Any tips on heater hose replacement would be appreciated.
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  #2  
Old 05-01-2010, 12:51 AM
wardak33's Avatar
wardak33 wardak33 is offline
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2002 Olds Bravada
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I honestly haven't heard of anyone changing heater core hoses on any car unless they were leaking or something. It doesn't call for it in the manual of our trucks. IMHO i would just leave it alone and just change the radiator hoses for the time being.
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2002 Oldsmobile Bravada: 4.2L I6 w/ G80 Locker, AWD, TBSS springs, HD bilsteins, 6000k HIDs, Mobil1, Iridium Plugs
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Old 05-01-2010, 11:01 AM
OldSVTGuy OldSVTGuy is offline
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2004 Chevy TrailBlazer LT
Sand Beige Metallic 4.2L I6 4X4
Join Date: Mar 2008
Location: Dryfork, WV
Posts: 37
Well, maybe I'll be the first. If so, I'll post a how-to. Rubber hoses that are this old with 105,000 miles should be replaced; they're fairly soft. I'll figure it out; will just have to move some things out of the way to get to that one by the lower radiator hose.
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Old 07-17-2010, 05:57 PM
pushl1 pushl1 is offline
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2002 Chevy TrailBlazer LT
Dark Green Metallic 4.2L I6 2WD
Join Date: Oct 2008
Location: los angeles, ca
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i have a 02 TB and i need to replace a heater hose

well they discontinued the hose i need (the hose that goes around the tranny and to the front drivers side of the block) do either of you have any leads on finding parts or doing the repair itself?
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  #5  
Old 07-19-2010, 10:44 PM
OldSVTGuy OldSVTGuy is offline
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2004 Chevy TrailBlazer LT
Sand Beige Metallic 4.2L I6 4X4
Join Date: Mar 2008
Location: Dryfork, WV
Posts: 37
I got all the necessary hoses through rockauto.com. You will also need to get the two heater hose connectors through a gm parts outlet - one is 5/8" and the other is 3/4". There are two rubber hoses that go to the line that goes behind the transmission which are crimped with an aluminum crimp. You will have to remove the crimp and the old hose and use a hose clamp on the metal part of the line where the new hose goes on (that is unless the hard line is leaking). You can use a dremel tool with a cutter.

I only replaced the heater hose that goes into the passenger's side of the block as the other one, under the insulation, looked really good and was still flexible. The other part of this hard line that goes behind the tranny comes up into the side of the block under the PCM on the driver's side. You will have to remove, at a minimum, the alternator, the battery and tray, and possibly the PCM to get it out of the way to get access to this hose. Again, it is crimped on and will have to be cut off. I did not replace it but still have the hose part if needed.

If you need hose part numbers, I can get them for you.

The other option, which I thought of, was to just run heater hose up the top of the engine and down to the driver's side, by-passing the old hose/hard line entirely. I see no reason that would not work. I think this hose was 3/4" at the heater; I'm not sure what size it is where it enters the block on the driver's side.

Good luck!!
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