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Climate control fan


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bluez956
User

Mar 23, 2021, 10:12 PM

Post #1 of 10 (800 views)
Climate control fan Sign In

1995 Mercedes E320 Wagon 185,000 mi.
The fan does not work. The guy I bought the car from suggest I replace the plug in module with a different module from the local Pick n Pull, but still does not function.
I am not sure where to start to eliminate components.
Is there a relay that might need replacing? Could it be the blower motor regulator, or the blower motor and fan assembly itself?


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 24, 2021, 12:21 AM

Post #2 of 10 (796 views)
Re: Climate control fan Sign In

Not my cars but a try to help. Can you isolate the last couple wires to the blower motor itself and see with just a test light or jumping it off/out of car that it works with power and ground?

Essentially I mean "bench test" for the motor itself then go from there what that shows,

T



Hammer Time
Ultimate Carjunky / Moderator
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Mar 24, 2021, 4:31 AM

Post #3 of 10 (789 views)
Re: Climate control fan Sign In

Test for constant power with the key on at the black wire of the blower motor.

If no power, check the 30A fuse at the left side of the engine compartment marked Climate Control auxiliary fuse.

If you have power there, then apply ground to the green wire and see if the motor comes on.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



bluez956
User

May 14, 2021, 7:31 PM

Post #4 of 10 (623 views)
Re: Climate control fan Sign In

I removed the blower motor and did a bench test.
The motor works fine. No issues.
When you try to turn the blower on nothing happens.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 14, 2021, 7:42 PM

Post #5 of 10 (614 views)
Re: Climate control fan Sign In

How does any of that jive with what i asked you to do?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on May 14, 2021, 7:42 PM)


bluez956
User

May 15, 2021, 4:04 AM

Post #6 of 10 (590 views)
Re: Climate control fan Sign In

I did not see a black wire at the blower motor, only red and blue.
The fusible link is intact. I did not however see a green wire.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 15, 2021, 4:21 AM

Post #7 of 10 (586 views)
Re: Climate control fan Sign In

The factory wiring diagram shows both green and black wires going to the blower motor. Check to see if something may have been spliced in to change colors.

Either way, one of those wires should have power all the time when the key is on and the other should show ground when the blower is turned on. We need to know which of those is missing. You need a test light that can identify either power or ground.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



bluez956
User

May 17, 2021, 4:58 PM

Post #8 of 10 (559 views)
Re: Climate control fan Sign In

Would those wires be the same wires going to the fusible link? Because those wires are green and black.

I do not have a test light, but I do have a digital multimeter.

I will attempt to determine which wires are which.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 17, 2021, 5:02 PM

Post #9 of 10 (555 views)
Re: Climate control fan Sign In

It doesn't matter.
Just find out whether you are missing power or ground at the motor.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 17, 2021, 8:29 PM

Post #10 of 10 (543 views)
Re: Climate control fan Sign In

It "bench" tested so motor works is missing that right at it - duh. Testing for ground, if missing you can back power pig-tail of a test light for this would rather an incandescent type as LEDs will respond to inadequate supply of either,


T







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