If the fan resistor burns out, or if the low fan speed circuit fails for other reasons, the fan will continue to cycle on the high setting to cool the engine, but the coolant (and engine) temperature will run about 10-15 degrees C high. The fan may not run after the engine is shut off, and <U>will not come on to cool the condenser</U>. A/C will blow warm air or shut off completely at idle or in start/stop traffic. If the fan is not repaired and the condenser continues to overheat, refrigerant may start to leak, or the A/C compressor may fail.
==Testing==
===Cooling Fan Relays and Fuses===
The Low and High fan control circuits are separate from the ICE module all the way to the fan motor. The cooling fan Low (20-amp) and High (30-amp) relays are located in the engine compartment relay tray, and labeled on the lid of the box. The two fan fuses (30A and 40A) are in the same location.
The fan can be tested with the engine on or off (but preferrably off), by removing first the "Fan Low" relay, and putting a test lead, or a heavy wire jumper between relay socket contacts #30 and 87. A heavier than normal wire or test lead is required due to the large fan current. The fan should now run on low speed even with engine off. The same test can be repeated with the "Fan High" relay. Use Fuse Taps (from RadioShack etc.) or similar flat contacts in the relay socket to avoid damage to the socket.
[[file:900_9-3_Fan_Test_4.jpg|thumbnail|none|Fig. 2 - Low Fan Speed Relay Socket]]
===References===
* Saab EPC 2-1770
* Haynes Ch 3, Section 5
* Haynes Ch 12, Diagram 2
===Fan Current===
===Simplified Wiring Diagram===
[[file:900_9-3_Fan_Test_2.gif|thumbnail|none|Fig. 6 - Simplified Radiator Cooling Fan Wiring Diagram]]
===References===
* Saab EPC 2-1770
* Haynes Ch 3, Section 5
* Haynes Ch 12, Diagram 2