Stalling/possible overheating in engine, but not registering on the temp gauge
95 saab 900 se convertable. Have had problemws with it stalling then dieing all together. I have been told it is the ignition coil which has been replaced 2X and repaired 2X. It seems to be an issue when the car gets hot, Any ideas
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you may have blown the head gasket.
check the coolant level,is it low?
if it is ok,check the fan switch on the radiator,change the thermostat,and check that the fan is working.
the fan has to work,saab engines run very hot.
there is a after run fan switch as well that measures engine compartment temperature,and can start the fan even with the car off,so be careful.
You don't say whether your electric fans both work...
First, check fuses #25 and #6 (both 30 amp)
There is a fan thermoswitch is on the left side of the rad. Turn the ignition on, and after pulling back the boot, short across the two terminals with a screwdriver.
If the fan runs, fan and wiring are both good, but thermoswitch might be faulty.
fan only runs when thermoswitch is shorted like this, switch needs to be
replaced (I strongly recommend that you get the low temp switch to prevent overheating - your temp
gauge will not go over the middle position even on the hottest days;
also get a low temp thermostat,and ALWAYS get a Saab stat, not an after
market one! The SAAB stats are three position, and most after market ones aren't)
if the fan doesn't run when switch is shorted, check for voltage between green wire and ground at the switch.
Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box for the A/C rad fan, and also check relay G - it's for the rad fan.
On my slightly older Saab the radiator fan is electric and only is engaged when the temperature meter reaches 3/4 to the top.
When the car is in motion it will not spin since the air flowing through the radiator from the speed is sufficient to maintain normal engine temp. Only when the car is still it for a few minutes it may start to spin especially during summer, it will sometimes continue to spin even after the engine is turned off. This is normal behavior for this car.
To conclude, if your engine temp only goes up to half the gauge there would be no need for the fan to start spinning. If it doesn't engage during the conditions I described above there would be a problem that needs to be fixed.
If you are on your original fuel pump, be advised that they are known to last, on average, about 100,000 miles. Another common fault, besides that and the direct ignition cassette you have already mentioned, is the crankshaft position sensor. The prelude to total failure of this component may prevent starting or cause stalling and rough running. The ECU needs the signal from this sensor to know when to signal the DIC to fire a particular plug.