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-   -   Can't Get Air Out of Heater Core / Considering Vacuum Kit (https://discoweb.org/showthread.php?t=96256)

The Fourth Amigo 12-03-2017 04:39 PM

Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Any advice on getting air out of the heater core? I've read lots on the subject but can't get it done. No loss of coolant overheating etc., just sloshing noise.

Anyone recommend a vacuum bleed/fill tool that will work with a DII?

discostew 12-03-2017 05:28 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Leave the cap off the reservoir until you have a steady stream from the small return port that is near the opening in the reservoir. It can't bleed itself with the cap on. If you have a steady stream from that port and have to bleed it again in a week or so, you might have a headgasket problem.

The Fourth Amigo 12-03-2017 05:42 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I have a steady stream from the small port. The problem started after I replaced the heater plate gasket last week. I remember, maybe 5 years ago, I had the same problem and just lived with it. It went away after I did some other job which required coolant filling. I guess I got lucky.

discostew 12-03-2017 06:37 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I would tell you to lift the reservoir off its mounts to get it higher than the heater core, but its not worth the risk if breaking one of those plastic pipes. Keep driving it.

The Fourth Amigo 12-03-2017 07:21 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I've lifted the reservoir and tried the vent screw, no air. I've driven around with the cap off, etc. Still get the annoying sound. I haven't tried it with the front end elevated, yet. I've drained the coolant many times on this vehicle during the 10 years I've owned it and this happened in the past. Sometimes I can get it corrected sometimes not.

luckyjoe 12-03-2017 07:52 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I have a long funnel, that I thread into the top radiator bleed port. It's about 20 inches tall and I fill it with coolant then let the engine idle through several t-stat open/close cycles. This always does the trick for me. However, at one point I remember the dealers were swapping the heater inlet/outlet hoses on D1's to reduce sloshing sounds - don't know if this would help on a D2 or not...

Lake_Bueller 12-03-2017 08:47 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I'm having the same problem after an engine swap. Not losing any coolant and the engine temp is solid. I had heat the first few days. Then it got worse and worse until now I have no heat.

4Runner 12-03-2017 11:22 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I have never had a DII but driving mine onto a pile of dirt to raise the front end way up has always worked for me. Besides it’s fun.

The Fourth Amigo 12-04-2017 02:07 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Quote:

Originally Posted by luckyjoe (Post 1067852)
I have a long funnel, that I thread into the top radiator bleed port. It's about 20 inches tall and I fill it with coolant then let the engine idle through several t-stat open/close cycles. This always does the trick for me. However, at one point I remember the dealers were swapping the heater inlet/outlet hoses on D1's to reduce sloshing sounds - don't know if this would help on a D2 or not...

Both sound like reasonably good ideas.

I have ordered a vacuum filling tool that a friend of mine who is a professional mechanic recommended. I'll let you know if it works out.

squirt 12-04-2017 05:46 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
https://www.bavauto.com/catalog/prod...waAmVIEALw_wcB

Funnel bucket.

gthphotography 12-04-2017 06:05 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
the issue stems from the horrible fact that the high point in teh D2 cooling system is in teh dashboard. What I do, and it has always worked for me is I jack the front of the truck up as high as I can and then pop the expansion tank out of its holder and raise it up as far as I can get it (this is usually above the high point in the dash adn then fill). Then, just to make sure, there is a parking lot by my place with a really steep hill. Ill drive onto the inclace, park the truck and then top off. Works every time.

luckyjoe 12-04-2017 10:18 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I use something like this. You can slowly work it into the radiator’s top fill plug on a D1/RRC, effectively tapping the plastic tip. Once you do this it will stand on it’s own without leaking, raising the coolant level about 15-17 inches.

https://cdn.shopify.com/s/files/1/10...g?v=1474039962

kk88rrc 12-06-2017 12:29 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Quote:

Originally Posted by luckyjoe (Post 1067966)
I use something like this. You can slowly work it into the radiator?s top fill plug on a D1/RRC, effectively tapping the plastic tip. Once you do this it will stand on it?s own without leaking, raising the coolant level about 15-17 inches.

I have a similar funnel with a threaded PVC fitting epoxied on that fits the radiator... works like a charm. Do not fill it too high because it will rise until the t-stat opens and then do not let it run empty or you may introduce air back into the system.

Howski 01-04-2018 10:33 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Ever get this sorted out? Having a similar issue after having successfully bled the system plenty of times in the past. What confuses me some is the water rushing noise has happened maybe 3 times in a week of driving since I worked on the cooling system. Coolant temps, coolant level (not losing any) and heat are all normal

The Fourth Amigo 01-04-2018 10:44 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I bought the vacuum kit. But while i was waiting for it to show up I tightened all of the hose clamps on the system and a day or two later the expansion tank level dropped. I topped it off and the sloshing noise is almost completely gone. I'm going to wait and see what happens before I drain the coolant to do a vacuum fill. Its been almost two weeks of stable operation.

Howski 01-05-2018 08:09 AM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Sounds like we have a similar situation. Did the level drop running with the cap on or off? May flip the heater lines as mentioned above if I can’t sort it over the next few days

the deputy 01-05-2018 09:56 AM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Or...park on one of these streets.

https://www.huffingtonpost.com/2014/..._4871559.html"

The Fourth Amigo 01-05-2018 12:20 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
The level dropped with the cap on, i guess it "burped".

squirt 01-05-2018 05:26 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Quote:

Originally Posted by the deputy (Post 1070088)

I drive those streets in Echo Park (Los Angeles) pretty regularly to avoid traffic driving out of downtown. 1st timers are just the worst, as they get afraid toward the peak (blind intersection) and stop... which means that everyone behind them needs to start on a 30%+ grade, and FWD cars just spin the tires and inexperienced drivers just roll backward. I don't know why anyone would ever live on those streets.

The Fourth Amigo 01-05-2018 06:06 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
DII is driving me crazy lately............

The sloshing sound has diminished and I'm not loosing coolant. Just changed the plugs and they all look fine, no overheating, brand new genuine LR expansion tank cap, engine running well.

Anyhow, the weird thing is that the coolant level in the expansion tank is lower when the engine is hot and returns to normal when cold. I believe this means that there's an air pocket still in the system. I'm going to have to try the vacuum kit.......

How much 50/50 coolant/distilled water mix do I need on hand for a standard drain and fill?

discostew 01-06-2018 10:07 AM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
You probably have a headgasket pumping air into the cooling system.

nolift911 01-06-2018 10:50 AM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I think you will find there is no real rhyme or reason or specific method for getting the air out of the system - everything mentioned will work, it just needs to be done over a couple of full warm up and cool down cycles. I had similar issues but after replacing the reservoir and cap with OEM and bled the system over a period of time with full warm up and cool downs it maintained a constant level and the sloshing went away.

One thing that has worked well for me is make sure your coolant reservoir and cap are in good working order, park the truck on a hill, engine facing up hill, heat on full, raise coolant reservoir as high as you can get it, keep cap off until it warms up and you should see some air bubbles burp out. I did this 3 cycles and my sloshing stopped. Another tell tail sign of air in the system is that the coolant level drops significantly overnight with no leaks.

It is true that after a number of cycles and after doing all of the above does not work - your motor is likely being pressurized. Generally that will show itself with a slow drip on the over flow drain. Head gaskets.

Dave03S 01-06-2018 12:46 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
I'll add one other tip, When the engine is stone cold, like overnight cold the next morning before startup, open the bleed screw and top up with coolant through the bleed screw. This still may take two or three mornings to get every bubble out but I've found it to work. Also its a good way to check your system for air at any time as usually bubbles make their way to that high spot. which would be even higher if you did park uphill.

coop74 01-06-2018 03:54 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
Quote:

Originally Posted by The Fourth Amigo (Post 1070076)
I bought the vacuum kit. But while i was waiting for it to show up I tightened all of the hose clamps on the system and a day or two later the expansion tank level dropped. I topped it off and the sloshing noise is almost completely gone. I'm going to wait and see what happens before I drain the coolant to do a vacuum fill. Its been almost two weeks of stable operation.

Could you not still pull a slight vacuum on the system with coolant present and just not put enough pressure to lift water/coolant but it should evac air??? I am asking and not positive on that. looking for comments...

The Fourth Amigo 01-09-2018 08:48 PM

Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit
 
1 Attachment(s)
I started to think it might be a head gasket so I wanted to do a pressure test. Went looking for a tester and couldn't find one locally, so I decided to make my own. It worked well and I found a small pinhole on the manifold outlet pipe behind the fan. The leak was quite small and the fan was blowing the coolant away making it difficult to find.

It held 20 psi for 20 min after I fixed the pipe. Hopefully I won't have any more issues for a while. I still haven't used my new vacuum fill kit, but I'm content to leave it in the box for now.


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