Thermo switch B (ECT B)

1994 HONDA ACCORD
77,000 MILES • 4 CYL
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GREATBATMAN11
  • MEMBER
  • 1 POST
Hello , 

I recently installed some new parts in my car listed above ex -coupe . A 1. new radiator, 2. new thermostat, 3. new ect sensor (located under the distributor) ,4. new fan switch a ( located on the thermostat housing) and new fan switch b ( located at the housing where upper radiator hose connects to the housing). all because part of my radiator cap broke off and fell inside the radiator and i had to thoroughly flush out the whole coolant system.
Everything seems to run ok except the fan does not turn on when the car is turned off (after driving )- in the past the fan used to run for 15-20 minutes after the car is shut off to cool the engine down. As per reading other stuff on the internet , it seems that fan switch b supposed to control that function --i.e to run the fan for 15-20 mins after the car is shut off. I have tested the new fan switch b in the hot water - its working fine and it does turn on at high temp ( 0 resistance) .
However, when i jumped the electrical connector with the paper clip it does not turn any of the fans [ as opposed to when i jump the electrical connector on the fan switch a then both fans are turned on].
Do i have a faulty electrical connector to the fab switch b ?? Is there any way to test it ? Would i need to replace the connector wire and socket ?
If someone can help me out how to diagnose the electrical issues with fan switch b and how to fix ( step by step)
Would greatly appreciate any kind suggestions

Thank you. 

Regards 
Jul 5, 2021 at 9:23 AM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

I'm struggling to determine what was actually done. I attached the wiring schematic below for the radiator cooling fans. Take a look through it and let me know, using the schematic I attached, you are jumping and where.

Also, let me know if you jump the relay in pic 1 if it turns on.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know as much as you can.

Take care,

Joe

See pics below.

Jul 6, 2021 at 12:09 PM
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