Rear A/C Lines - 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 General Tech Q&A > General

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  #1  
Old 03-29-2010, 12:39 PM
trail-b1 trail-b1 is offline
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2003 Chevy TrailBlazer LT EXT
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Rear A/C Lines

Hi, I am new to the site and hope someone can help. I have a 03' Trailblazer EXT with the V6 if it mattters. I just tried to use the A/C last week for the frist time since the winter and it did not work. I took it to a dealer who diagnosed it as a leaking high pressure line to the rear coil. This line is apparently aluminum and runs above the frame befor the body it put together. I was told they could not repair the line and needed a new one which had over a day of labor. Total cost esimate was $1,100.00 The mechanic said they have seen this before and is common do the road salt in the Northeast. He actually said they have seen this happen evan sooner. I did notice while changin the oil myslef for the first time in a while that I have what I think is a fair amount of rust on the underside for the truck for something at that is only 5 years old and just 70K miles. I have a few questions.

1. Does that estimate seam fair?
2. Why cant they just cut and patch the refrigerant line?
3. If the cant repair the line, why cant they just run another line external and hopefully not made out of aluminum? I did ask if they would be putting the same type of line in and was told yes.
4. Is this truly a common failure. I am shocked that something would rot out on a $40K vehichle in 5 years that costs $1100 to repair.

I plan on keeping this truck for another 5 years or so and do not want to back wih the same problem in few more year and am also concerned about the low side or sucion line which apparently runs up the other side of the truck. My guess would be that it is corroding at a similar rate toe the other if they both are exposed to the same enviroment.

To make matters worse, I was told that they could not gauratee this would fixt the problem untill they replace the line and then charge/change oil and run it. I understand this but this is large bill to be underake with still some risk.

Any insight to the above would be greatly appreciated.

Thanks,
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  #2  
Old 03-29-2010, 03:43 PM
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the roadie the roadie is offline
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We certainly hear this often for owners in salt-using states. Underbody washing might help - we're not sure. It's a horrible design fault by the junior engineers GM used on the platform. There are others. I seem to recall somebody did a short repair pipe around a localized pinhole, but I'm not certain. Sorry.

If cost is a huge factor you can ask them to bypass the rear unit, and just live without AC in the wayback.
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Old 03-29-2010, 03:59 PM
trail-b1 trail-b1 is offline
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Thanks. I acutally asked dealerships mechanic if they could bypass the rear coil and he said they never tried that and he did not want to try. I hope someone else on this site and come up with a morst cost affective fix.
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Old 03-29-2010, 04:15 PM
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the roadie the roadie is offline
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Find an independent AC specialist. Dealer's mechanics are trained to swap OEM parts, not come up with creative solutions to real-world problems.
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Old 03-29-2010, 04:31 PM
trail-b1 trail-b1 is offline
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Thanks, I think thats where I will end up. I may also try another dealer to see if they are more adventurous.
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Old 03-29-2010, 06:38 PM
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linneje linneje is offline
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This is a very common problem with these vehicles if you drive on gravel roads as the line is exposed to rocks from the rear wheel (pass side). I had this problem - took it to a friend who runs an independent shop. He said that there is a kit with the proper fittings to replace just a section of the line ... at my GM dealer. So he took it to GM just to get them to install the patch line. Then he took it back, recharged and tested it, and then put some rubber insulation around the exposed section to protect it from stone chips.

Total bill (including the GM work) was $750.

Now, I live in Canada, so there may be some differences in parts and kits available from the dealers ... but I think the estimate is way too high. If I had a GM dealer with a patch line kit, there has to be one available for you somehow...
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Old 03-29-2010, 07:29 PM
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RayVoy RayVoy is offline
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Hi trail, I've had the same problem.

Like linneje, I had mine repaired with a repair kit.

I went to a local shop that specializes in AC and radiators.

I don't remember the cost (last summer), but I do recall that it was very reasonable, even less than the 750 linneje paid. I think it was less than $200.

I haven't tried it yet this year, but it worked fine after the fix last summer.
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Old 03-29-2010, 08:57 PM
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the roadie the roadie is offline
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Quote:
Originally Posted by trail-b1 View Post
I may also try another dealer to see if they are more adventurous.
50-50 shot they're more larcenous. Adventurous dealers are an oxymoron. (Two words that really don't belong together.)
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Old 03-30-2010, 09:50 PM
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RayVoy RayVoy is offline
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50-50 shot they're more larcenous. Adventurous dealers are an oxymoron. (Two words that really don't belong together.)
go to an A/C shop
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Old 07-13-2014, 03:51 PM
grumpy22 grumpy22 is offline
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Grumpy 22

I amin the same boat, so to speak, with a leak in the rear high pressure line, just back of the RF wheel. The line is formed wrong, and it rubs hard on the top of the frame at that point. May be wear or corrosion (there is a flexible heat sleeve over it at that point), Can't tell which. Can't bend the line away from the frame without kinking it, and the dealer in Nova Scotia wants 1200 to replace. Will check anAC shop for one of those kits.
Just for info, the price is so high because the body must be raised off the frame on the passenger side as there is no other way to install the piping assembly; great design.
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