ECC fan control resistor. Any way to test one off car?

Post by **JimBee** » 06 May 2023, 14:17

From what I'm reading I assume the resistor is shot. Fan is always running. On/off or speeds don't respond to ECC changes.

I have a resistor pulled from a junk yard car. It looked pretty fresh. Does anybody have specs for testing one before installing?

Post by **jreed** » 06 May 2023, 15:04

I can offer up my inconclusive measurements using a transistor tester in situ (ie without removing the FET for testing):
viewtopic.php?t=82990

Post by **BEJinFbk** » 07 May 2023, 23:04

My two cents - I'd just plug in the replacement and see what ya get.

Post by **wizechatmgr** » 07 May 2023, 23:38

I believe it receives a PCM signal, so it's not merely a resistor pack...
*stuffs foot in mouth, wrong year...*

Post by **JimBee** » 08 May 2023, 09:00

I have a used HVAC resistor pulled from a 96 850. I notice that FCP designates a different one for the 93-95's. What will happen if I plug in the 96 resistor in my 93 ECC?
Also, the 96 resistor has a few blemishes on one vane and the other vanes are a bit soiled. Can those vanes be cleaned? Is there a special coating on them that could be easily damaged?

Post by **jreed** » 08 May 2023, 16:12

My memory is that those vanes are made from aluminum, and usually it's extruded. I bet it won't hurt to clean or scrub the aluminum. If there is a special coating like anodization and you remove it during cleaning, the aluminum will re-form a self passivating aluminum oxide layer that can resist further corrosion.