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Re: Thanks! Re: Dead temp gauge- 95 CS Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 15 Nov 2007 05:35:02
In Reply to: Thanks! Re: Dead temp gauge- 95 CS, jim, Wed, 14 Nov 2007 15:20:42 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Hearing the fan come on isn't an issue. The purpose of the fan is to make sure air is moving over the radiator. When you're driving along, the radiator gets a nice cooling flow of air. When you slow down or come to a stop, that air stops flowing. But the radiator still has to dump off heat. So the fan kicks on to replace that airflow. The cooling system isn't so overdesigned that it can dump all the engine heat by radiation alone - it needs the airflow. And even if it is cool outside, that doesn't make up for the flow of air at speed.
A temp gauge is important, but don't fixate on it too much. Especially in a later car like yours. In earlier years, the temp gauge follwed the engine temperature closely. Engine temperatures vary due to load, airflow, outside airflow, how the thermostat is opening, etc. So the needle would move around - higher when stopped in traffic, lower going down hills or when the thermostat first opens. This caused lots of feedback to the dealers and needless hand-wringing. Yes, the engine gets hot sitting at idle!
So from '95 on, Saab changed the software in the EDU that drives the temperature gauge. Basically, the needle will move up to about the 7:30 or 8:00 position when the car is warm, and it will stay there. Won't budge when sitting in traffic in August or coasting down a hill on a freezing day. If the temperature gets too high, the needle will move up and warn you. The gauge normally reads a bit lower than most folks are used to - it can mask a stuck open thermostat. (You'll notice this by a lack of heat.)
So yes, get the gauge working, and replacing the thermostat is always good. Remember to put it in with the little bleed hole UP. Or as up as possible - it goes in at a slant. This allows the system to automatically bleed. But don't start to worry if the gauge appears to read low, just like you can't congradulate yourself on an excellent cooling system because the gauge always reads nice.
posted by 192.249....
, Wed, 14 Nov 2007 05:06:24, Thu, 15 Nov 2007 05:35:02 <-- Viewing This Message
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