Date: Mon, 28 Aug 2006 19:36:18 GMT
From: (Kevin Rhodes)
Subject: Re: 2002 Saab 9-5 cracked heater valve

In article <>, "yaofeng" <> wrote: >I don't know anything about the 9-5. Are you sure it has a heater >valve? If there is a heater valve on the 9-5 it is indeed going >backward. The c900 has a heater control valve. It is a mechanical >device to regulate coolant flow into the heater core actuated by >control inside the cabin. Any c900 owner knows the heater control >valve is notorious for leaks. SAAB recognized this and changed the >design in the 9000. The 9000 colant circuit for heating the cabin has >no valves or any mechanical device to regulate coolant flow. Instead >the heater core is enclosed in a box. Cabin temperature control is >done by regulating air flow throught the box. Although the heater core >still goes bad and leak the robustness of the design improves >significantly over that on the c900. > >Maybe someone can clarify if indeed the 9-5 has this feature. I rather >doubt it. The valve in question does not control the heat to the cabin, it shuts the coolant flow off completely. It is either on or off. This is so that the A/C does not have to cool off heated air when the A/C is on full blast. You can bypass the valve with a piece of pipe and you will likely never know the difference - you would just have slightly warmer A/C on the coldest setting. The valve is actually used on all sorts of GM vehicles, and costs ~$40 from Cadillac dealers, as they sell just the valve. Saab sells the valve plus all the attached hoses for ~$300.... Kevin Rhodes Westbrook, Maine '00 9-5 SE v6t Wagon 67K, still on original heater valve

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