rear A/C line leak - 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

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Old 08-09-2010, 02:01 PM
CBWLOAF5 CBWLOAF5 is offline
Junior Member
2003 Chevy TrailBlazer LT EXT
Black 4.2L I6 4X4
Join Date: Jul 2010
Location: lawrence, kansas
Posts: 1
rear A/C line leak

I've got a leak in one my rear a/c lines. I would like to fix this issue. However, I've discovered through some of the threads that this can be a pricey repair. I've been exploring short term solutions and I wanted to get some opinions. Has anybody tried by-passing the rear a/c? In particular, I've seen a rear a/c block kit in my research online. I'm seeking opinions on if this is a viable option from individuals who have a/c repair experience.


Info on the rear a/c line block kit:,1/
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2002 to current Chevrolet Trailblazer and Envoy Block Kit
Price: $70.00

ATMGMTBE Used to Block of 2002 to current Chevrolet Trailblazer and Envoy

2002 - Current Chevrolet Trailblazer and GMC Envoy
CAUTION: Refrigerant is under high pressure be sure to evacuate the system before servicing.
1. Dissassemble aluminum block fitting located in the drivers side wheel well.

2. Replace with the larger diameter block fitting with new sealing washer and fasten using bolt and nut supplied in the kit

3. Dissasemble aluminum block fitting in the passenger wheel well.

4. Remove the stud that is fastened inthe block fitting in the line going to the rear and reinstall the stud in the smaller diameter blockfitting supplied in the kit

5. Replace the sealing washer, and reinstall the block fitting onto the line using the factory nut and stud

NOTE: Adjust refrigerant charge about 1 - 1 1/4 less than factory specifications.
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Old 08-09-2010, 06:43 PM
RayVoy's Avatar
RayVoy RayVoy is offline
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2009 Chevy Avalanche LTZ
Black 5.3L V8 4X4
Join Date: Jul 2006
Location: Atlantic Canada
Posts: 6,431
I have used a repair kit that repaired the leak in the ac line (less than $200, out the door).

Your repair sounds, to me, like you are cutting off the lines to the rear.
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Old 08-09-2010, 07:32 PM
Copper93 Copper93 is offline
2008 Chevy TrailBlazer LT
Silver 5.3L V8 4X4
Join Date: Sep 2009
Location: Charlotte, NC
Posts: 135
My dad has an 03 Envoy that started leaking from the lines running to rear. We bypassed the old lines and ran new ones. We used flare fittings and copper tubes. My brother works on residential a/c systems and had all the parts. The repairs has been on the Envoy for awhile and we haven't had any problems.
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Old 08-09-2010, 08:51 PM
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tricguy007 tricguy007 is offline
2004 GMC Envoy SLE
Summit White 4.2L I6 4X4
Join Date: Jun 2010
Location: apple valley, mn
Posts: 132
i have used the block off kit they work great, a lot cheaper than to replace the lines and u will still have front a/c and u dont have to cut anything off so u can still replace the rear lines when the money is available
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Old 09-22-2010, 01:47 PM
ldp103 ldp103 is offline
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2005 Chevy TrailBlazer LS EXT
Steel Gray Metallic 4.2L I6 4X4
Join Date: Nov 2009
Location: 203
Posts: 12
Thanks for this post I have the same problem with the leak and $1800 bucks is alot right now. I will try this and see how it works out.
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Old 09-22-2010, 03:59 PM
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linneje linneje is offline
2003 GMC Envoy SLT XL
Black 5.3L V8 4X4
Join Date: Dec 2008
Location: Melfort, Sask.
Posts: 325
It can be more expensive here in Canada, and I still had it fixed for $700 by a shop ... about 1/2 to diagnose and then recharge and the other half to replace the bad section of line with a kit from the dealer. Sounds like they are trying to replace the whole line for that price ... not necessary.

Shop mechanic told me that they get these vehicles with this problem all the time, pelted with stones ... so he put some insulation around the exposed area (included in price) to help this problem from reoccurring.
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