Why is the low speed fan not working on my Saab?
If the fan never comes on after the engine is shut off, the low speed circuit may not be working. 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.
How to test the fan on a Saab 900?
Use Fuse Taps (from RadioShack etc.) or similar flat contacts in the relay socket to avoid damage to the socket. To measure the fan current, put a meter set to a 20-amp range in series with the test leads, across contacts 30 and 87. It is safer to test the fan curent with engine off:
When does the radiator fan run on low or high?
Regardless of whether the fan is cycling on low or high, the gauge will stay at 9 o’clock. The cooling fan runs on Low when the coolant temperature is over 100C, and High when over 113C.
What happens when a radiator fan is not repaired?
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. The Low and High fan control circuits are separate from the ICE module all the way to the fan motor.
If the fan never comes on after the engine is shut off, the low speed circuit may not be working. 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.
Use Fuse Taps (from RadioShack etc.) or similar flat contacts in the relay socket to avoid damage to the socket. To measure the fan current, put a meter set to a 20-amp range in series with the test leads, across contacts 30 and 87. It is safer to test the fan curent with engine off:
How long does a car cooling fan run after you turn off the engine?
Any and all information greatly appreciated. My damn cooling fan stays on for at 4 minutes or more, after having turned the car off. Plus, it sounds like a loud lawnmower! Electrical fan run for a long time after turning the engine off.
Regardless of whether the fan is cycling on low or high, the gauge will stay at 9 o’clock. The cooling fan runs on Low when the coolant temperature is over 100C, and High when over 113C.
How often does a car cooling fan stay on?
Cooling fans stay on at all times Average rating from 129,472 customers who received a Vehicle Engine Cooling Inspection. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool.
Why is my low speed fan not working?
If the fan low speed fails, the condenser will overheat. The most common reason is a burned out fan resistor. In warm weather, the fan should run briefly after engine is shut off. If the fan never comes on after the engine is shut off, the low speed circuit may not be working.
How can I test my fan with the engine off?
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.
What are the symptoms of a bad cooling fan relay?
Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.
Why is the fan not working on my Saab?
The most common reason is a burned out fan resistor. In warm weather, the fan should run briefly after engine is shut off. If the fan never comes on after the engine is shut off, the low speed circuit may not be working.
Where are the fan fuses on a Saab 900?
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.
What kind of resistor does a Saab fan use?
The resistor is a cheaply made wire-wound, ceramic-insulated type, about 0.20-0.25 ohms. The resistor is not sold as a separate part by Saab, but it can be easily replaced by a generic 50-75 watt resistor of a similar value.
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.