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The EATC version doesn't have a "resistor", it has a blower speed control module instead.
Still sounds like a bad blower module. You might have replaced one with one particular failure mode with a module that has a different failure mode. The EATC is the only other thing possible, except wiring. The blower relay cannot cause your symptoms, it can only cause a "no blower operation" symptom.
The factory service manual does have a comprehensive diagnostic routine to help pinpoint the fault.
The EATC version doesn't have a "resistor", it has a blower speed control module instead.
Still sounds like a bad blower module. You might have replaced one with one particular failure mode with a module that has a different failure mode. The EATC is the only other thing possible, except wiring. The blower relay cannot cause your symptoms, it can only cause a "no blower operation" symptom.
The factory service manual does have a comprehensive diagnostic routine to help pinpoint the fault.
The EATC controller works fine I don’t think it’s the problem and I too think it’s the module, kinda strange a brand new one would fail. This one I bought is for a 07’, wasn’t a listing for 06’.
How do you know? Did you make the requisite checks of the control and feedback circuits that control the blower motor speed module?
This one I bought is for a 07’, wasn’t a listing for 06’
06 and 07 use the same module.
kinda strange a brand new one would fail.
I learned a LONG time ago (the hard way, of course) that just because a part is new does not automatically mean that it's good. It's only classified as good when that has been proven.
I had an 06' F350 with the same problem. I replaced the blower speed control which was a large transistor module in a heat sink. I think it is just a voltage divider.
It sits on the firewall under the hood just behind the blower on the passenger side. The blower motor speed is high by default when this goes out. Very common problem.
Check connector
They call it a resistor module, but on the 06' F350 it was a large transistor sitting down in a heat sink.
Yeah, that's pretty much what it imitates. Allows the blower speed to be pretty much "continuously variable" instead of only four steps like the manual systems. It does appear to have an internal relay that bypasses the transistor when the blower is to be at "Max".
The blower motor speed is high by default when this goes out.
Unless the internal relay happens to also fail.... However, max speed is the most commonly seen failure mode.
They call it a resistor module
By "they", I assume you're referring to auto parts stores. Ford doesn't call it that, they distinguish it, by using its correct name, from the basic resistor module used in the manual system.
I don’t really want to throw parts at it, it be nice to find another EATC dash controller to try and swap out to rule it out.
it seems to me it’s the blower module still, does anyone have a method of testing it on a bench? Resistance checks or such. I still have the old module would like to see if it’s the culprit or it’s something else.
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