electrical cooling fan question
Thread Starter
Racer
Joined: Mar 2007
Posts: 323
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From: Austin Texas
electrical cooling fan question
so.. im having some cooling fan probs... long story.. what i need to know is , do the cooling fans run in series electrically for low then parralel for high? or is there even a low and high???
Melting Slicks
Joined: Apr 2006
Posts: 2,151
Likes: 20
Yes, there are three relays with one of them simply being a toggle. I believe it's 44. From what I remember 45 energizes at low speed and 44 directs the series power from the driver's side fan to the passenger side fan then to ground. When 43 and 44 are energized (high speed) 44 re-directs the power from driver's side fan directly to ground and 43 sends power to the passenger side fan.
Thread Starter
Racer
Joined: Mar 2007
Posts: 323
Likes: 0
From: Austin Texas
They do run in series for low speed operation with half the voltage across each fan motor. Then in high speed they get switched to a parallel configuration with 12 volts across each fan. Here's a wiring diagram:
For low speed operation relay 45 is triggered putting the fans is series through relay 45's normal position. Then when high speed mode is needed both relay 43 and 45 are triggered. Relay 44 ground's the left fan and relay 43 provides the 12 volts for the right fan which already has a ground connection. Check the 3 fuses as well as the 3 relays if you are having problems with the fan operation.
Describe what your problems are and the failed component(s) can be determined.
For low speed operation relay 45 is triggered putting the fans is series through relay 45's normal position. Then when high speed mode is needed both relay 43 and 45 are triggered. Relay 44 ground's the left fan and relay 43 provides the 12 volts for the right fan which already has a ground connection. Check the 3 fuses as well as the 3 relays if you are having problems with the fan operation.
Describe what your problems are and the failed component(s) can be determined.
Instructor
Joined: May 2010
Posts: 237
Likes: 0
From: Albuquerque NM
well it was the drivers only..... today I went out to check it out and theyre both working in low...... I have been slowly fixing some subtle ground issues maybe I fixed it. Also when I first command the high fans it makes a loud noise like a starter solenoid perhaps the fans are just on their way out???
