Yeah, the dealership said it's the canister and that they don't sell the part anymore was discontinued. I will probably have to go to a pull-a-part and see what I can find.
I have a 2004 Blazer 3 button. I have replaced the majority of the vacuum lines described but when I go into 4 wd I get a p0445 error code. A large leak but only when I switch. Originally it did it but I lost 4wd. I didn't have enough vacuum to work actuator. Any ideas where to start?
I have a 2004 Blazer 3 button. I have replaced the majority of the vacuum lines described but when I go into 4 wd I get a p0445 error code. A large leak but only when I switch. Originally it did it but I lost 4wd. I didn't have enough vacuum to work actuator. Any ideas where to start?
You could still have a leak. Perhaps in the hose to the front axle or in the vacuum storage tank. Something which I am not familiar is when fluid gets into the lines that go to the transfer case.
You could still have a leak. Perhaps in the hose to the front axle or in the vacuum storage tank. Something which I am not familiar is when fluid gets into the lines that go to the transfer case.
Thanks I have checked the vacuum tank I'll look for the line to the axle next
Out of curiosity, does the size of the line make a huge difference on its performance? I replaced the small line between the T and the one way valve with a piece of 5/32 I thought matched it in size, would this cause any issues?
Out of curiosity, does the size of the line make a huge difference on its performance? I replaced the small line between the T and the one way valve with a piece of 5/32 I thought matched it in size, would this cause any issues?
I don't think it would make much of a difference if the new size is not too different from the original.
For those of you interested in the lengths and sizes for the vacuum hoses that control your transfer case and HVAC that live under the hood of your rigs, here is the list of the sizes and length of each I used on my '99 Blazer LT with 4WD (4-button 4wd/Auto-4wd/NVG236 transfere case) (see below for 3-button transfer case)
Intake supply line:..............................................7/32" ID, 7/16" OD, L = 20" [ light green line in schematic] lines to transfer case:.........................................5/32" ID, 5/16" OD, L = 7' (total of both lines) [ blue and red lines in schematic] to vacuum reservoir:...........................................3/16" ID, 5/16" OD, L = 8" [ light blue line in schematic] between Tee and one-way valve (vac supply):......7/64" ID, 1/4" OD, L = 3" [ grey line in schematic]
(The brown line in the schematic is a cable, not vacuum line.)
Regarding the hose connection to the vacuum diaphragm for the front axle located under the battery tray: The OD of the hose that goes to the vacuum actuator for the front axle is as important as the ID. This is because this hose connects to the actuator using a FEMALE fitting, not a male (i.e. a nipple) fitting. And as we all know, not all hoses with the same ID have the same OD. I lucked out with this one as I did not know that when I purchased my hoses.
Of course I purchased more hose than I needed. Except for the smallest diameter hose, I ended up with 16" to 22" extra and 9" extra for the smallest ID hose.
You'll likely want to do round up the lengths to the nearest foot so that you can have a little extra to allow yourself to reroute any of your lines if you desire.
Christine
Hint: If you want a bit of extra insurance, you might do what I did and use zip-ties as mini hose-clamps where each of the hoses attach to the nipples.
Here is a schematic of the hose connections posted by mike5511 (post #29) who found it elsewhere on BF.com.
This information is from Fitz (post 23):
P.S. I am continually updating this first post in this thread with additional details and ideas others have contributed.
Your diagram shows a "vacuum reservoir". It appears to be in the fender/wheelwell area. My 02 Blazer, 4WD, has no such animal in that location. But there is a vacuum hose that I can't locate a connection for. When I started taking the rotted hose off, all of it came off in my hand and I didn't see where it came off from. What am I missing?
Your diagram shows a "vacuum reservoir". It appears to be in the fender/wheelwell area. My 02 Blazer, 4WD, has no such animal in that location. But there is a vacuum hose that I can't locate a connection for. When I started taking the rotted hose off, all of it came off in my hand and I didn't see where it came off from. What am I missing?
Oh it's in there. A small flashlight and a mirror will help to find the nipple for the reservoir. Once you see it, it will help you locate it by feel to reattach the hose.
Oh it's in there. A small flashlight and a mirror will help to find the nipple for the reservoir. Once you see it, it will help you locate it by feel to reattach the hose.
My problem now is that the hard plastic tubing's are breaking off almost at the touch. Can that stuff be replaced? I know I'm working with an 18 year old vehicle, but it's my 2020! I gotta fix this thing.
11-12-2019, 09:54 AM
