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My Baby Needs Burping - Please Help 900 1994

posted by  Townshend Act on  Wed Feb 7 00:08 CST 2024
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last visit: Tue Oct 7 22:44 CST 2014
[RELATED]

Hello Everyone,
I have long "suffered" from my 940 Turbo being unable to burp a small/moderate amount of air out of the heater core.
Whenever the engine is started for the first time, there is a distinct gurgling sound from behind the dash, clearly from the heater core.
All the rudimentary bleeding methods have been employed, and proper refilling procedures adhered to at change over times. There are no leaks of the G-48 coolant whatsoever in the entire system, and it is filled to the proper level. The water valve is OEM brass and functions as designed, and the heater always blows hot, which is further evidenced by both heater hoses being hot to the touch when at operating temperature.
I even purchased a Maddox MH-1B Cooling System Test & Refill Kit from dear Harbor Freight and gently pulled down the system until the hoses collapsed, wherein the negative vacuum held for 5 minutes. But alas, after that procedure, the same sound comes at start-up from the heater core.
What am I missing?
I would appreciate and advice or direction.
John






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