Peterbilt 379 Fan Relay Location at Amy Beasley blog

Peterbilt 379 Fan Relay Location. Basically, the ecm sends out 12 volts on pin 11 whenever the ecm wants the fan off. If the ecm says the fan should be off and the ac pressure switch and coolant temp agree, then you need to very carefully follow the. Pull the ecm connector and the relay, use a ohm meter to check between wire. It works when i turn it on manually, but it won't come on. If nothing can be seen with the service tool, you most likely have a faulty fan control solenoid, fan hub, or broken fan control. So pete installs a normally closed relay to the fan control valve. It is on pin 11. If nothing can be seen with the service tool, you most likely have a faulty fan control solenoid, fan hub, or broken fan control wire that runs from the engine ecm. Main cab harness dash panel harnesses ( a, b, c ) powertrain engine harness transmission. Is it a sensor causing the fan not to turn on when the water temp. Your ecm should put out 12 volts if it wants the fan on. Thats the swtich that will turn the fan on when the a/c is on and say your not. You could have a bad high press switch on the a/c. This way when the ecm send out power, it opens the relay.

Basically, the ecm sends out 12 volts on pin 11 whenever the ecm wants the fan off. It works when i turn it on manually, but it won't come on. If nothing can be seen with the service tool, you most likely have a faulty fan control solenoid, fan hub, or broken fan control. Main cab harness dash panel harnesses ( a, b, c ) powertrain engine harness transmission. So pete installs a normally closed relay to the fan control valve. Thats the swtich that will turn the fan on when the a/c is on and say your not. This way when the ecm send out power, it opens the relay. Is it a sensor causing the fan not to turn on when the water temp. Pull the ecm connector and the relay, use a ohm meter to check between wire. Your ecm should put out 12 volts if it wants the fan on.

Peterbilt 379 Hvac Wiring Diagram

Peterbilt 379 Fan Relay Location If the ecm says the fan should be off and the ac pressure switch and coolant temp agree, then you need to very carefully follow the. If nothing can be seen with the service tool, you most likely have a faulty fan control solenoid, fan hub, or broken fan control. Pull the ecm connector and the relay, use a ohm meter to check between wire. This way when the ecm send out power, it opens the relay. You could have a bad high press switch on the a/c. If nothing can be seen with the service tool, you most likely have a faulty fan control solenoid, fan hub, or broken fan control wire that runs from the engine ecm. Main cab harness dash panel harnesses ( a, b, c ) powertrain engine harness transmission. Basically, the ecm sends out 12 volts on pin 11 whenever the ecm wants the fan off. Is it a sensor causing the fan not to turn on when the water temp. It is on pin 11. If the ecm says the fan should be off and the ac pressure switch and coolant temp agree, then you need to very carefully follow the. It works when i turn it on manually, but it won't come on. So pete installs a normally closed relay to the fan control valve. Your ecm should put out 12 volts if it wants the fan on. Thats the swtich that will turn the fan on when the a/c is on and say your not.