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once you get the correct anti-freeze for the car, drain the radiator and if your so inclined you can remove the block drain plugs to drain the engine block. close up all drains and then add your anti-freeze. add one jug of water with one jug of anti-freeze to get the proper mixture. when the rad is full run the motor to operation temp and make sure the coolant system is full as well as make sure the overflow bottle is full.
what may be happening is a partially stuck thermostat is causing blowout through the overflow tube during operation..might try a lower pressure cap on the system like a 4-6 lb cap ..it lowers the pressure in the system and work your way up to a higher pressure cap 14-16..also get the system flushed you might have blockages in some passageways or buildup in it..
Quite possible that the fan has quit due to the lower temperature as the thermistor is set Up. Now this can be confirmed once the car is warming up to go beyond the set engine temperature.
So unless this is confirmed all that you need to do is to check if there is a fuse link break to the fan motors.
the manual is stating that theres a lifetime warranty on the anti freeze through saab and/or your dealer. theyre trying to get the business back to their store instead of you going to pep boys or meineke. the maintenance manual is the one you should run by because im pretty sure no normal grade coolant/anti-freeze lasts 100K miles without getting milky or dirty.
really though, you should change the coolant every time you see it starts to get dirty or if youre low on it.
Possible solution for susuns: turns out my problem was an improper freon charge. If your problem is the same as mine your a/c cools very well, but stops blowing air after about 20 minutes. If so, your evaporator core is freezing over and the ice is blocking air flow. Also after parking the truck water will continue to drip from the truck for a long time. To test this theory next time it occurs, switch the selector to vent and the fan to high. You should notice the air flow return within 5-10 minutes or less, however the air will still be quite cold due to the ice formed on the core. If all this fits your situation, take your truck to an experienced technician and have the freon pressures checked. My system needed to be charged a little on the high side to prevent the freezing up.
Hope this helps, capn0623