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1994 Saab 900 S convertible running hot

My Saab 900 S convertible is still running hot even after I had the radiator rodded and the thermostat changed......

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  • 51 Answers

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.

If 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.

Hope this helps!

Saabreur

Posted on Aug 09, 2009

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you may have blown the head gasket.
or
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.

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Starter


Is this a v6 engine or 4 cylinder?
Justin
Strictly Saab
Melbourne, FL

Aug 27, 2008 | 1994 Saab 900

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