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Ask George H. Your Own Question
George H.
George H., ASE Certified Technician
Category: Saturn
Satisfied Customers: 18538
Experience:  ASE Master Tech 15+ Years
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Ac clutch dies after turning the blower motor switch to more

Customer Question

ac clutch dies after turning the blower motor switch to more than 2nd speed for example speed 3 and 4 turns off the ac clutch
JA: Has the clutch been slipping? Are you having any trouble shifting?
Customer: no
JA: What is the model/year of your Saturn?
Customer: 2004 Saturn vue and is the air conditioning not the transmission
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: new ac module
JA: Anything else you think the mechanic should know?
Customer: blower motor keeps blowing is just the a/c clutch disengages
Submitted: 8 months ago.
Category: Saturn
Expert:  George H. replied 8 months ago.

Hello I will help,

You replaced the module on the dash that has the blower switch mounted on it?

Let me know how I can help

Thank you

Customer: replied 8 months ago.
but its still not working
Expert:  George H. replied 8 months ago.

That is where the problem should be. Has anyone put a scantool on this to watch the AC request in the body module as you change the blower speeds?

Customer: replied 8 months ago.
no
Expert:  George H. replied 8 months ago.

If you have a good voltmeter I can help you check that signal so you can watch it but a scantool that displays the body and engine computer data makes it much easier to check.

The way you check is to monitor the voltage on the request wire and see if it stays steady as you change form 1 to the higher speeds. If it does then the problem is not in the control but if it does change then you still have a problem in the control.

Was the control you installed new or used?

Customer: replied 8 months ago.
used, and it does not stay it fades out
Expert:  George H. replied 8 months ago.

What does not stay and fades?

Customer: replied 8 months ago.
the volt on the number three pin coming out of the control unit
Expert:  George H. replied 8 months ago.

I don't understand what you are testing? The request line to the BCM?

I can't see or know what you have done unless you describe it to me.

Customer: replied 8 months ago.
the signal request changes
Customer: replied 8 months ago.
the signal changes on the request wire.
Expert:  George H. replied 8 months ago.

OK, then you still have a problem in the panel.

Try car-part.com and find it local so if you have to return it you can deal face to face.

Customer: replied 8 months ago.
ok ill let you know what happens thanks
Expert:  George H. replied 8 months ago.

Great, please let me know if you have further questions

Thank you

Customer: replied 8 months ago.
good morning
Customer: replied 8 months ago.
I put in a new ac control module and still have the same problem
Expert:  George H. replied 8 months ago.

Good morning

Expert:  George H. replied 8 months ago.

The voltage on the request pin still falls off when you increase the blower speed?

can you just turn the blower speed down and have the clutch come back on or do you have to restart the vehicle?

Can you monitor the voltage feed to the panel when the blower is on high?

Customer: replied 8 months ago.
it falls off and yes the clutch comes back on just by turning it back to speed 1 or 2 and yes I can monitor it on hi and it has no signal on high just speeds 1 and 2
Expert:  George H. replied 8 months ago.

Does the voltage to the panel itself fall off as well?

Have you replaced the blower resistor?

Customer: replied 8 months ago.
let me check
Expert:  George H. replied 8 months ago.

OK

Customer: replied 8 months ago.
no the volt on pin #11 does dropp
Customer: replied 8 months ago.
does not drop sorry
Expert:  George H. replied 8 months ago.

OK, then I don't have a reason other than anecdotal evidence that the resistor pack would have any effect on the AC request other than the control is monitoring that the blower motor is running before it will request the compressor on.

I have seen several reports that replacing the resistor will solve the problem. I have nothing to back up why it would.