Rocket Man's 02 Denali Build Thread AKA "THE BEAST"

[Rocket Man]

yea i need to try and get a part no off it or something, its just a universal one with 3/8 oring fitting in and out, but where its mounted ive got to replace it with one pretty much the exact same size +/- 1/2"

I was gonna say look at your receipts or orders but I would bet your receipt box is pretty extensive.

 

[89Suburban]

I figured I’d get everything flushed except the line I ordered. Everything was going good until I got to the rear. I looked underneath the rear floor where the lines connect to, I’m assuming, the rear evaporator. I figured I’d just flush everything in place, no sense to disconnect the lines and flush the evaporator separate. So I loaded 3/4 a quart of cleaner, hooked up a hose to the return line to collect in a bucket, and hit the button on the tool. I was ready this time but I was expecting it to come out the return line. It did not. It shot back out of the line I was putting it into. Something is completely blocked. Not sure if it’s the evaporator or the lines but I’ll bet which one it is. I pressure washed that area and removed the nuts holding the lines on. The big one came off. The small one not so much. I shot it with WD and waited a bit, put some vise grips on the block and tried twisting and pulling. Nothing. It’s hot out there so I am on break again. Ill pull the interior panel tomorrow morning and get that line off. Then I’ll figure out wtf is going on. I do have a new evaporator on order if needed. But that line needs to come off. Maybe if it soaks overnight. It’s not an easy spot to get to as far as prying and such.

Are you reverse flushing it?

 

[Rocket Man]

Are you reverse flushing it?

I’m flushing it forward, reverse and sideways.

I pulled the rear panel and I was expecting the evaporator to be right there. But of course it’s contained in the case AKA auxiliary HVAC module. Removal of that requires disconnecting the heater hoses as well as the AC lines from under the vehicle. I’m sure the quick connects on the heater hoses will break. And I tried putting the vice grips and yanking and pulling on that ac line. I was shaking the whole truck and it’s up on jack stands on that side. I quit before I did something stupid. I’ll wait until the morning. Then probably do something stupid.

@RAMurphy did you flush your rear system, and if so did it flush from the front or did you disconnect the lines at the rear? This is a problem right now. That line that I’m
yanking on is $300 and discontinued. I’m not even in a rust belt, I can imagine what these look like on a vehicle from those areas.

 

[Rocket Man]

I’m thinking about deleting the rear AC. I never use it. Anybody know how? Seems I could just use the same rubber pieces they use to seal up the new parts with, just block the tubes at the engine compartment.

 

[iamdub]

I’m thinking about deleting the rear AC. I never use it. Anybody know how? Seems I could just use the same rubber pieces they use to seal up the new parts with, just block the tubes at the engine compartment.

I'm sure they have them for yours (maybe even the same part), but there's a block-off that installs on the drier at the firewall, where the lines that go to the rear attach. Lemme see if I can find it...


*EDIT* Here ya go, Amazon boy: https://www.amazon.com/BK7055-Rear-Block-Off-Kit/dp/B06X9F3GXS

Research it, but the compressor might need to be changed to one that's for a non-rear A/C truck. There might be a volume difference or something. Maybe not, but it's worth investigating.

 

[Fless]

Eric O posted the delete a few days ago:

 

[Rocket Man]

Well that was quick. After reading a few threads on those rear lines, it seems they don’t come off, they get seized to the studs and even unobtainium can’t separate them. The choices are to cut the lines, buy new lines and the evaporator or block it off and use front ac only. I ordered a block off kit. It will be here tomorrow. The rear has never worked anyway. Of course now I’ll start thinking about buying the new line…but what a huge amount of work that would be running that hard line all the way up to the front. I could really reef on that fitting now though, since I’ll have the block off kit in case I break it…

Edit: I was posting at the same time as you guys. There’s only one compressor that’s set up for my truck, I’m pretty sure it’s just the amount of refrigerant you add.

 

[RAMurphy]

I’m flushing it forward, reverse and sideways.

I pulled the rear panel and I was expecting the evaporator to be right there. But of course it’s contained in the case AKA auxiliary HVAC module. Removal of that requires disconnecting the heater hoses as well as the AC lines from under the vehicle. I’m sure the quick connects on the heater hoses will break. And I tried putting the vice grips and yanking and pulling on that ac line. I was shaking the whole truck and it’s up on jack stands on that side. I quit before I did something stupid. I’ll wait until the morning. Then probably do something stupid.

@RAMurphy did you flush your rear system, and if so did it flush from the front or did you disconnect the lines at the rear? This is a problem right now. That line that I’m
yanking on is $300 and discontinued. I’m not even in a rust belt, I can imagine what these look like on a vehicle from those areas.

@Rocket Man My initial plan was to remove the heat exchanger but I found exactly what you found. I was able to flush it from underneath similar to what you are trying. I did not have the issue you are experiencing. Have you tried just air, what pressure are you using? Reverse flow at a higher pressure?

 

[RAMurphy]

Well that was quick. After reading a few threads on those rear lines, it seems they don’t come off, they get seized to the studs and even unobtainium can’t separate them. The choices are to cut the lines, buy new lines and the evaporator or block it off and use front ac only. I ordered a block off kit. It will be here tomorrow. The rear has never worked anyway. Of course now I’ll start thinking about buying the new line…but what a huge amount of work that would be running that hard line all the way up to the front. I could really reef on that fitting now though, since I’ll have the block off kit in case I break it…

Pulled up my notes and I actually had the same issue as you and flushed using the lines. Which would explain why it took me so much longer to flush the rear.

 

[Rocket Man]

This is the kit I bought. It is indeed the BK7055 Dub.