Hi,
Would appreciate any advice on this problem I have.
Aircon gassed up, pressures getting very high and front mounted fan not cutting in.
Ruled out pressure switch, as unplugged this and compressor cuts out.
Relay has the 12v feed from the battery, and the main engine relay.. so 2x 12v feeds.
Wire out from relay to cooling fan has low resistance, so not a bad wire.
When bridging the relay, the fan runs perfectly fine so its not seized and working... also checked fan fuse which is good, wouldn't run fan if was bad and when fan is running pressures come down to normal pressures for the ambient temperatures.
So problem seems to be that the ECU is not switching on the fan or the wire is bad, I've managed to find out the wire is a Green / White wire.
Are there any known problems relating to this wire or the ECU not switching the negative wire to activate the fan?
I found this on another forum,
For A/C system:
⇒ On When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28 °C (82 °F) or more
⇒ Off When vehicle speed increases to (62.5 mph (100 km/h) or ambient
temperature decreases to 25 °C (77 °F)
Surely that cant be right? the pressures kept going up and up without that fan running, admittedly it didn't reach 28 degrees today... but ive never come across another vehicle where the Aircon fan doesn't activate. Although I can understand it if the viscous fan is generating enough airflow its not always required.
Guess I can test it, by removing the sensor and placing it against the condenser which gets certainly above 30 degrees,
Or is the problem with the viscous fan not generating enough airflow?
Thanks
Would appreciate any advice on this problem I have.
Aircon gassed up, pressures getting very high and front mounted fan not cutting in.
Ruled out pressure switch, as unplugged this and compressor cuts out.
Relay has the 12v feed from the battery, and the main engine relay.. so 2x 12v feeds.
Wire out from relay to cooling fan has low resistance, so not a bad wire.
When bridging the relay, the fan runs perfectly fine so its not seized and working... also checked fan fuse which is good, wouldn't run fan if was bad and when fan is running pressures come down to normal pressures for the ambient temperatures.
So problem seems to be that the ECU is not switching on the fan or the wire is bad, I've managed to find out the wire is a Green / White wire.
Are there any known problems relating to this wire or the ECU not switching the negative wire to activate the fan?
I found this on another forum,
For A/C system:
⇒ On When vehicle speed is 50 mph (80 km/h) or less and ambient
temperature is 28 °C (82 °F) or more
⇒ Off When vehicle speed increases to (62.5 mph (100 km/h) or ambient
temperature decreases to 25 °C (77 °F)
Surely that cant be right? the pressures kept going up and up without that fan running, admittedly it didn't reach 28 degrees today... but ive never come across another vehicle where the Aircon fan doesn't activate. Although I can understand it if the viscous fan is generating enough airflow its not always required.
Guess I can test it, by removing the sensor and placing it against the condenser which gets certainly above 30 degrees,
Or is the problem with the viscous fan not generating enough airflow?
Thanks
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