Saab 900 won't run in the rain

SOURCE: 1994 Saab 900 S convertible running hot

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