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Old 11-02-2008, 03:42 AM   #1
STI_KLR
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Default "Burping" Cooling System Problems..

Ok, on Friday I installed a new CXRacing aluminum radiator into my 2002 WRX. Everything went w/o a hitch including the "burping" process...or so I thought. I did just as the instructions called for (open radiator and overflow caps, let car run until all bubbles, etc cease) but I believe it keeps finding air bubbles. I can go and drive it around for 20 mins, an hour etc, but after the car sits for a little bit, the top radiator hose is pinched shut. Does anyone know why this keeps happening? Maybe I'm just not doing the burping process correctly.

I also noticed that the lower radiator hose is leaking a tiny bit. It drips a drop or two about every 10 seconds or so...

Thoughts? Opinions?
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Old 11-02-2008, 06:12 AM   #2
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bumppp
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Old 11-02-2008, 11:32 AM   #3
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You want to fill up the reservoir and squeeze the upper hose at the radiator a few times, kind of slowly so as not to blast coolant out the top of the reservoir.. Fill a little more, squeeze the hose some more. Keep doing that, it takes a bit and you have to be patient. Once you've got that about the best you can and it doesn't really want more coolant, start the car and let it run a bit, and slowly fill the reservoir as it runs. You'll notice it sucking the coolant out, just keep filling.


And get some good hose clamps on the lower hose. Make sure it's not kinked. You guys that didn't trim that lower hose probably have a noticeable kink in that hose, and that's not a good thing. That's why I suggested trimming
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Old 11-02-2008, 11:58 AM   #4
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Haha yes, yes, I know. I figured out what was wrong with that hose...let's just say, that maybe I got a tad careless, and forgot to tighten it the rest of the way.... It doesn't leak a drop now! haha

But I just spent the last 45 minutes burping it again. I did it MUCH slower and only added a tiny amount at a time. I guess we'll see here in a little bit if it all worked. I was pinching the upper hose while doing it also. So I really hope it's finally done... lol
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Old 11-02-2008, 12:05 PM   #5
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You don't need to pinch the hose as you go, just fill the reservoir, then slowly squeeze and release about 10 times until the level goes down. Then repeat. And repeat. And repeat. And repeat.


By the way, @ you for not tightening the lower hose
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Old 11-02-2008, 01:57 PM   #6
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Quote:
Originally Posted by Audiosavvy View Post
You don't need to pinch the hose as you go, just fill the reservoir, then slowly squeeze and release about 10 times until the level goes down. Then repeat. And repeat. And repeat. And repeat.


By the way, @ you for not tightening the lower hose
I only did a few times when it looked like it needed a little, motivation, to get the bubble out haha



I felt so stupid when I got under there and realized that it was completely tight... I was genuinely flabbergasted.
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Old 11-02-2008, 07:22 PM   #7
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Did you finally get it completely bled?

If you are still having trouble, I must ask- did you remember to turn on the heater full blast as you cycled the coolant? I've seen people spend hours trying to "burp" hoses on coolant systems, but forget that they get all kinds of air trapped within the heater core.

If you've already done so, just ignore me. Otherwise, I bet this will solve your problem.
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Old 11-02-2008, 08:16 PM   #8
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Ignored!


hahah jk jk. Yea, I was running the heat full blast. The car was a sweatshop But I think it is FINALLY all bled. It's only taken...7 times since Friday afternoon? I'll check later on to see if it's true...if not, I may just kill myself lulz.
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Old 11-02-2008, 08:39 PM   #9
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these cars might take the longest possible out of any other cars to fill coolant
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Old 11-02-2008, 09:04 PM   #10
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It's absolutely pathetic.
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Old 11-02-2008, 09:09 PM   #11
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Quote:
Originally Posted by conrad87 View Post
these cars might take the longest possible out of any other cars to fill coolant
Nope, try a MK3 Supra once. You had to either jack up the front of the car or park on a hill. Then it would take hours to get all the air. i don't miss that car at all.
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Old 11-02-2008, 09:15 PM   #12
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Quote:
Originally Posted by Oldfart Racer View Post
Nope, try a MK3 Supra once. You had to either jack up the front of the car or park on a hill. Then it would take hours to get all the air. i don't miss that car at all.
Note to self: Avoid ALL MKIII Supras

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Old 11-02-2008, 09:20 PM   #13
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I own one don't every want another one. It was a bigger money pit than my WRX.
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Old 11-02-2008, 09:23 PM   #14
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Quote:
Originally Posted by STI_KLR View Post
Note to self: Avoid ALL MKIII Supras


The radiators on the old Corvairs are IMPOSSIBLE to change, they really suck.
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Old 11-02-2008, 09:52 PM   #15
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Yeah...you know a trick I use that works well on my 03's to jack the front end of the car in the air as high as I can get it. Then I fill it. Since I've been using that technique, I don't bother burping any more. I just fill it, drive it some and re-check the fluid level later.

It's not clear if this will work on an 02 though.
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Old 11-02-2008, 10:36 PM   #16
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WHAT A ****ING SURPRISE.





I checked the top radiator hose just now: completely compressed. I'm going to lose it I swear. I've been doing everythingggggg. I've been adding the coolant with the car up on ramps AND on an incline. So it's like a 2fer. Ugh, this crap is annoying.
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Old 11-02-2008, 10:52 PM   #17
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I filled mine, start to finish, in 15 minutes on flat ground, and never once have had any issues.

Last edited by Audiosavvy; 11-02-2008 at 11:14 PM.
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Old 11-02-2008, 11:09 PM   #18
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I don't actually know what he means by "completely compressed" as in it's being sucked closed or something? That pinching the hose thing was made up here on NASIOC, there's nothing about it in the manual. I never do it. I have had an air pocket one time and haven't since I jack the front up (it's normally jacked up when for other reasons when I drain and fill).
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Old 11-03-2008, 12:07 AM   #19
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The hose is literally compressed/pinched shut. It keeps doing this after the car sits for a little while after I drive it. Once I open the radiator cap and relieve the pressure, it opens right back up.

I don't know why this is giving me such a hard time. Maybe the Scoob is giving me life lessons? Meh..
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Old 11-03-2008, 12:19 AM   #20
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It suggests you have a bad radiator cap. The system's supposed to be a closed loop. When the pressure in the system exceeds the cap's set pressure, the coolant goes into the coolant tank, when the engine cools down, it sucks the water back out of the tank. Sounds to me like the check valve in the cap isn't working so, water goes out and never returns. If the cap was good before, it suggests you have it plumbed wrong. Remember, new cap doesn't mean good cap. Might want to re-install the old one if you've already replaced it.
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Old 11-03-2008, 12:20 AM   #21
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radiator cap.
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Old 11-03-2008, 12:50 AM   #22
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I didn't replace it - it's the same one.

EDIT: Let me clarify, since the bugs don't have a "radiator" cap, I'm referring to the coolant reservoir cap. As far as I can tell, there isn't anything going into or out of the overflow tank either. It's always at the same level that I filled it up to on Friday. I plumbed everything back up the way the stock radiator was....so I don't think that's the problem?
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Old 11-03-2008, 01:03 AM   #23
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You still have a radiator cap, it's just not on the radiator, it's on the reservoir.
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Old 11-03-2008, 01:05 AM   #24
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Quote:
Originally Posted by Audiosavvy View Post
You still have a radiator cap, it's just not on the radiator, it's on the reservoir.
Lol that's what I figured... It's just weird/confusing to me calling it that since it's not actually on the radiator.

But you get the idea
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Old 11-03-2008, 09:43 AM   #25
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You still need to trim your upper radiator hose since you put in the larger radiator. Thats why its clamping shut, the bend you have it in is too tight. Cut 1/4" off the front part of the hose, re-burp with the heat on, replace radiator cap. Air and water travel in the path of least resistance, you have some restistance.
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