Why is my cooling fan not working on my Mazda 3?
The electric engine cooling fan won’t come on in my Mazda 3. The first thing I did (a mistake, in retrospect) is replace the original fan. When the new fan didn’t run, I ran through the electrical diagnostic procedure in the service manual using a multimeter.
How much does it cost to replace a Mazda cooling fan?
The last step in the electrical diagnostics is replacing the PCM which I’d rather avoid! Additional info: I found out that the green wire is listed in Mazda parts as a “harness” or “condenser”, part #LF50-66-991A and is an astonishing $30-$40 to replace.
What to do when your cooling fan won’t work?
When the new fan didn’t run, I ran through the electrical diagnostic procedure in the service manual using a multimeter. Power and ground check out, so does continuity on the signal line across the wiring harness (from the “plug” to the PCM.)
What should the RMS voltage be on a Mazda 3?
On AC voltage setting, the meter should only display the AC part, ignoring the DC offset. So a good “True RMS” meter should read near 7 V. A more basic meter that averages the voltage and scales it assuming it’s a sine wave might read around 7.6 V.
What to do if your Mazda radiator fan is not working?
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Why are the cooling fans not working on my car?
1. Engine running hot 2. Cooling fans do not function 3. 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.
Where is the radiator fan located in a car?
The radiator fan is positioned between the radiator and the engine and is in charge of cooling the car and keeping the occupants at a comfortable temperature level.
What are the symptoms of a bad cooling fan relay?
1. 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.
The electric engine cooling fan won’t come on in my Mazda 3. The first thing I did (a mistake, in retrospect) is replace the original fan. When the new fan didn’t run, I ran through the electrical diagnostic procedure in the service manual using a multimeter.
Is it normal for a car fan to run after the engine is turned off?
It’s “normal” for a thermostatically controlled fan to run after the engine is switched off – in fact it may even start running a short time after switch off, as the residual heat in the engine transfers to the coolant. But from your description it seems like the fan might be running all the time, if it starts up when the engine starts.
Why are my cooling fans running at all times?
3. Cooling fans stay on at all times. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.
The last step in the electrical diagnostics is replacing the PCM which I’d rather avoid! Additional info: I found out that the green wire is listed in Mazda parts as a “harness” or “condenser”, part #LF50-66-991A and is an astonishing $30-$40 to replace.
When to replace the motor on a fan?
This tells you that the fan motor is fried and needs to be replaced. Before you do replace the fan, you should take your multimeter and make sure that female terminal 30 has 12 Volts. If 12 Volts are present, then you can confidently replace the fan motor.
Why does my Ford Escape have two fan motors?
Fuses don’t get blown for no reason, so when you do see a blown fuse, it’s usually because the fan motor is starting to draw too much amperage. As you may already know, your Ford Escape (Mazda Tribute) comes equipped with two cooling fan motors held together in one big plastic assembly.
How big are the relays on a Mazda Tribute?
If you have the four cylinder engine, the relays rating will be 40 amps, If you have the six cylinder engine, the relays will be 50 amps. Now look for smaller square relays #22 and # 24. Check those too. It’s hard to believe the fans run on all that but one or more must be failing. There is no easy test for relays.
This tells you that the fan motor is fried and needs to be replaced. Before you do replace the fan, you should take your multimeter and make sure that female terminal 30 has 12 Volts. If 12 Volts are present, then you can confidently replace the fan motor.
What to do if your cooling fan won’t turn on?
Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor.
What does it mean when your radiator fan is not working?
This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.
Why does my car have a radiator fan?
You probably already know the purpose of the radiator and the cooling system in your car. When you are driving fast, the wind is passing through the radiator to cool the coolant down without issues, but when you are driving slow, there is no wind pushed through the radiator. This is why we use a radiator fan.
When the new fan didn’t run, I ran through the electrical diagnostic procedure in the service manual using a multimeter. Power and ground check out, so does continuity on the signal line across the wiring harness (from the “plug” to the PCM.)