84 upgrade
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Instructor
Joined: Jun 2018
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That is the ecm one. The fan is controlled solely by a heat switch. Replacing the fan one with the wrong sensor type will cause it to not work. The sensor you need for the fan in the passengers side head is this One.
Le Mans Master
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From: New Jersey
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The sensor you need for the fan in the passengers side head is this One.
I'm using an ACDelco D1855B CTS in my '84, and it works great! If the engine is idling for a long time, the fan will cycle on and off, just as it should. This CTS is rated at 215 on/200 off. The connector you need should be available at your favorite auto parts store, Dorman 85140. It's also available at Rock Auto: https://www.rockauto.com/en/moreinfo...041196&jsn=479
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Instructor
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That CTS (coolant temp switch) is rated at 200 on/185 off. That 185 deg off temp may be too cool, unless you're running a 160 deg thermostat. If you're using a 180 or higher thermostat, the engine may never get cool enough to turn off the switch, so the fan will run continuously. You don't need all that other stuff in that kit, either.
I'm using an ACDelco D1855B CTS in my '84, and it works great! If the engine is idling for a long time, the fan will cycle on and off, just as it should. This CTS is rated at 215 on/200 off. The connector you need should be available at your favorite auto parts store, Dorman 85140. It's also available at Rock Auto: https://www.rockauto.com/en/moreinfo...041196&jsn=479
I'm using an ACDelco D1855B CTS in my '84, and it works great! If the engine is idling for a long time, the fan will cycle on and off, just as it should. This CTS is rated at 215 on/200 off. The connector you need should be available at your favorite auto parts store, Dorman 85140. It's also available at Rock Auto: https://www.rockauto.com/en/moreinfo...041196&jsn=479
Le Mans Master
Joined: Aug 2017
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From: New Jersey
That CTS (coolant temp switch) is rated at 200 on/185 off. That 185 deg off temp may be too cool, unless you're running a 160 deg thermostat. If you're using a 180 or higher thermostat, the engine may never get cool enough to turn off the switch, so the fan will run continuously. You don't need all that other stuff in that kit, either.
I'm using an ACDelco D1855B CTS in my '84, and it works great! If the engine is idling for a long time, the fan will cycle on and off, just as it should. This CTS is rated at 215 on/200 off. The connector you need should be available at your favorite auto parts store, Dorman 85140. It's also available at Rock Auto: https://www.rockauto.com/en/moreinfo...041196&jsn=479
I'm using an ACDelco D1855B CTS in my '84, and it works great! If the engine is idling for a long time, the fan will cycle on and off, just as it should. This CTS is rated at 215 on/200 off. The connector you need should be available at your favorite auto parts store, Dorman 85140. It's also available at Rock Auto: https://www.rockauto.com/en/moreinfo...041196&jsn=479
Thread Starter
Instructor
Joined: Jun 2018
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Le Mans Master
Joined: Aug 2017
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From: New Jersey
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I didn't go back and read the entire post, but have you checked the relays to see if there is an issue there ? And/or other fuses, the wiring etc ? You could be chasing an entirely different issue if it is not turning on with a new switch. I know some of the relays are interchangeable and you might be able to just swap 2 around and see if it makes a difference.
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From: Mission Viejo CA
If you insist on using a stupid switch, this can be done by connecting to wires that are under your dashboard. You don't need to go thru the firewall.