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Old May 6, 2025 | 05:09 PM
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On m y 1984 with the ac off the cooling fan runs all the time while engine is on. Could I have a bad cooling fan switch
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Old May 12, 2025 | 01:19 PM
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Either that or a short in the wiring.
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Old May 12, 2025 | 05:27 PM
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Or the PO did what was done to mine. The green/white wire going to the cooling fan relay (located under the brake master cylinder) had been cut and grounded to the chassis. The green/white wire is connected to the AC pressure switch and the coolant temperature switch (CTS) which when either is grounded will turn on the fan. By permanently grounding that wire it makes the fan run constantly.

See what I mean? Bubba had just wrapped some electrical tape around the twist. The yellow wire is grounded to the chassis. I kinda like having the fan all the time so I just heat shrinked it properly. The pic just shows the fan relay connector, the relay itself is normally right below attached to the fender wall under the master cylinder.
See what I mean? Bubba had just wrapped some electrical tape around the twist. The yellow wire is grounded to the chassis. I kinda like having the fan all the time so I just heat shrinked it properly. The pic just shows the fan relay connector, the relay itself is normally right below attached to the fender wall under the master cylinder.
Looking back and forth between this diagram and the connector you can follow that the thick red wire goes to the battery via a fusible link, the blue wire goes to a 3 amp fuse in the passenger side fuse box, the green/white wire (normally) goes to the brown and tan wires for the AC switch and the CTS, and the black/red wire supplies power from the relay to the cooling fan.
Looking back and forth between this diagram and the connector you can follow that the thick red wire goes to the battery via a fusible link, the blue wire goes to a 3 amp fuse in the passenger side fuse box, the green/white wire (normally) goes to the brown and tan wires for the AC switch and the CTS, and the black/red wire supplies power from the relay to the cooling fan.
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Old May 15, 2025 | 09:42 AM
  #4  
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From: Monroe Twp, NJ
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Originally Posted by typical boomer
Or the PO did what was done to mine. The green/white wire going to the cooling fan relay (located under the brake master cylinder) had been cut and grounded to the chassis. The green/white wire is connected to the AC pressure switch and the coolant temperature switch (CTS) which when either is grounded will turn on the fan. By permanently grounding that wire it makes the fan run constantly.

See what I mean? Bubba had just wrapped some electrical tape around the twist. The yellow wire is grounded to the chassis. I kinda like having the fan all the time so I just heat shrinked it properly. The pic just shows the fan relay connector, the relay itself is normally right below attached to the fender wall under the master cylinder.
See what I mean? Bubba had just wrapped some electrical tape around the twist. The yellow wire is grounded to the chassis. I kinda like having the fan all the time so I just heat shrinked it properly. The pic just shows the fan relay connector, the relay itself is normally right below attached to the fender wall under the master cylinder.
Looking back and forth between this diagram and the connector you can follow that the thick red wire goes to the battery via a fusible link, the blue wire goes to a 3 amp fuse in the passenger side fuse box, the green/white wire (normally) goes to the brown and tan wires for the AC switch and the CTS, and the black/red wire supplies power from the relay to the cooling fan.
Looking back and forth between this diagram and the connector you can follow that the thick red wire goes to the battery via a fusible link, the blue wire goes to a 3 amp fuse in the passenger side fuse box, the green/white wire (normally) goes to the brown and tan wires for the AC switch and the CTS, and the black/red wire supplies power from the relay to the cooling fan.
Tanks for the info
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