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Date: Tue, 14 Dec 2004 12:46:13 +0000
From: Grunff <>
Subject: Re: c900 heater core bubble???

Dave Hinz wrote: > I replaced the thermostat in my '86 900, and apparently I have a bubble in > the heater core. The thermostat gets to a nice termperature, but the heat > isn't coming in by me. I'm not seeing the bleeder valve I expected to see > up in that area on or near the firewall, does someone have a procedure > they could point me to? > > I used Grunff's suggestion of opening the bleeder nipple on the thermostat > housing, but I'm failing to see how that, being lower than the heater core, > is going to help. What am I doing wrong? I've usually managed to clear it by opening the thermostat bleed nipple and revving the engine - it's the revving that does it. There was one time when I just couldn't clear an airlock, so I pre-filled the heater core by connecting one end to a garden hose and flushing through at high flow. That worked. -- Grunff

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