Date: Tue, 14 Jun 2005 17:12:36 -0400 From: "Valjean" <jvaljeannospamamcharter.net> Subject: Re: Overheating=(
I'm familiar with the scene he's described; mine, though, runs hot(ter) now at high speed. It's still at around 3/4s on the gauge, however. How's that? Now when it's cool outside, it has run at around 1/4. I do have the fan switch and thermostat you alluded to installed, too! (and not the blue coolant, since I intend to replace two heater hoses first...).. "Malt_Hound" <Malt_Houndnospamm*yahoo.com> wrote in message news:C8SdnW74oZ9JNTTfRVn-2wnospamphia.com... > es wrote: >> hi my 1990 9000 cd turbo is overheating the fan is working theres no >> leaks but it overheats in traffic not on the highway. idles good runs >> good but it really gets hot when the car is not moving. it was good in >> the winter but now that its hot out it Overheats. what could it be? >> > > I have read all of the responses you have received thus far and nobody has > given you the correct advice yet. The key to diagnosing your problem is > something you stated above: "overheats in traffic not on the highway." > > Think carefully about that statement. What this is telling you is that, > when the engine heat load is the highest (at highway speeds) the > temperature is normal, but when sitting still and idling (lower heat load) > the engine temperature climbs. > > Those symptoms indicate that the majority of your cooling system > (radiator, water pump and thermostat) is relatively healthy. It will do > its job if you get enough cold air flowing through the radiator. You also > stated that the fan is running. 9000s have two speed fans which are > thermostatically controlled. When the radiator temperature gets above a > certain point (or if the AC is on) you should hear the fan's high speed > kick in. Without the high speed the engine temperature will climb in > summer's heat. > > The original set points on the thermostatic fan switches were too high > (92C) IMO. Switches with lower set point (82C) can and should be bought. I > would combine that switch upgrade with a lower temperature (82C vs 92C) > thermostat. And no, you should never just remove the t-stat. They are > not that hard to get to and change, and also a cooling system flush/fill > with SAAB (blue stuff) coolant. > > http://townsendimports.com/Web/entry/tech_doc_systems.htm > > Go to this web site and read up on the cooling systems info in the > technical documents. There is wealth of information here. Do not allow > your SAAB engine to overheat again or you will very likely get to replace > the head gasket. (much less fun) > > I've owned 2 9000's, (still have one) both of which exhibited cooling > system problems such as yours and worse. In both cases, after upgrading > the switch and thermostat to lower temp units and flushing / filling with > blue stuff, they have run many trouble free miles. > > -Fred W
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