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Date: Tue, 19 Jun 2007 07:06:35 -0400
From: Fred W <malt_houndnospamo.com>
Subject: Re: 97 9000T temperature gauge stays low


Echo088880nospaml.com wrote: > On Jun 18, 6:39 pm, "Richard" <rootnospamlhost> wrote: > >><Echo088...nospaml.com> wrote in message >> >>news:1182205366.509271.31400nospam000hse.googlegroups.com... >> >> >>>Driving my 97 9000T today, on this 80 degree day. I'm noticing my >>>temperature needle sitting about a quarter inch above the blue when >>>I'm going up a hill and expect the needle to be climbing a little. So >>>I continue to watch the needle and it stays about the same. I stop the >>>car and idle to build up some heat -- and the needle still doesn't >>>move (well, maybe a fraction of a millimeter). I shut off the ignition >>>and all the needles fall as usual. Start-up and the needle rises to >>>the same quarter inch above blue. >> >>>I have an 82 deg. thermostat, that I'm wondering if it's stuck and >>>making the fan come on more than usual, or exactly what's going on. >>>Any thoughts on this? >> >>Hi! >>Does the needle indicate a "cold" engine when you first start it? >>Do you have a thermometer to check the real temp of the engine? >> >>Richard > > > > Yes, starts off in the blue and moves up to about 1/4 inch above as > the engine warms up (as expected) and seems to stay right there (7-o- > clock) while driving. Sometimes it goes lower, but since I've noticed > this, I can't get above that 1/4 mark no matter what I do, even > letting it idle after driving. > > I usually don't notice how often the fans come on, (my perception > being they always came on as the temperature rises (higher than 1/4 > inch above blue). But when I checked this from outside the car (where > I could hear clearly), they seem to be almost constantly cycling on > and off -- when I'm idling with the gauge reading 7-o-clock, the fan > is on 90% of the time. And it doesn't seem to run once I've shut the > ignition off. That doesn't seem normal to my recollection. Is it? > A couple of things: First off, even if the electric fan runs 100% of the time it cannot cause your engine coolant temperature guage to be low. Yjonk of it this way: driving down the highway at 80 mph you are forcing way more air through the radiator than the electric fan can. A low engine temperature condition would be caused by the thermostat being stuck open or opening too soon. The usual problem with the 4 cylinder SAAB engines in the 9000's is too high of a temperature and overheating. The only problem you should experience if the engione is too cold would be poor fuel mileage. When I had both my '92 and '93 9000's I put lower temp (82 degree) thermostats in each of them and also lower temp switches in the radiators. The temp needle on each would rise to 9 o'clock and stay there solid. When the fan kicks in has to do with whether the car is moving along briskly or sitting in hot traffic. The fan will come on any time the temp of the coolant in the radiator is too hot, regardless of the temp of the engine. It will also come on (and should stay on) when the AC is on. Try turning the ACC to economy mode (AC off) and see when the fan comes on/off. It is preferable to have the fan come on early and often as that keeps the coolant in the radiator at a lower temp which makes it easier for a properly operating thermostat to regulate the engine temp. The only downside is that you are using a little power. -- -Fred W

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