Date: Tue, 14 Dec 2004 01:39:31 -0500
From: "hippo" <>
Subject: Re: c900 heater core bubble???

Dave Hinz (suffering frozen fingers) 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? Only proc I have is to *slowly* refill expansion tank with the engine off and thermostat bleed nipple open until coolant leaves the nipple. that's always seemed to work on 900s. Only suggestion is to try what I have to do on my Subies: run engine up to full operating temp, put heater full on, park facing up the steepest hill you can find (I've got a handy 1 in 3 road on the farm!) make sure it can't roll away and repeat the bleed procedure. It's always worked so far. If that doesn't work, all I can suggest is join your heater hoses together, flush the heater core and see if it's blocked. (Oh joy!) Cheers

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