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Old 12-03-2017, 04:39 PM   #1
The Fourth Amigo
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Default 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?
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Old 12-03-2017, 05:28 PM   #2
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Default 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.
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Old 12-03-2017, 05:42 PM   #3
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Default 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.
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Old 12-03-2017, 06:37 PM   #4
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Default 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.
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Old 12-03-2017, 07:21 PM   #5
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Default 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.
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Old 12-03-2017, 07:52 PM   #6
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Default 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...
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Old 12-03-2017, 08:47 PM   #7
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Default 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.
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Old 12-03-2017, 11:22 PM   #8
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Default 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.
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Old 12-04-2017, 02:07 PM   #9
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Default Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit

Quote:
Originally Posted by luckyjoe View Post
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.
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Old 12-04-2017, 05:46 PM   #10
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Default Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit

https://www.bavauto.com/catalog/prod...waAmVIEALw_wcB

Funnel bucket.
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Old 12-04-2017, 06:05 PM   #11
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Default 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.
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Old 12-04-2017, 10:18 PM   #12
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Default 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.

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Old 12-06-2017, 12:29 PM   #13
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Default Re: Can't Get Air Out of Heater Core / Considering Vacuum Kit

Quote:
Originally Posted by luckyjoe View Post
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.
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