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Ask George H. Your Own Question
George H.
George H., ASE Certified Technician
Category: Saturn
Satisfied Customers: 18659
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: 1 year ago.
Category: Saturn
Expert:  George H. replied 1 year 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 1 year ago.
but its still not working
Expert:  George H. replied 1 year 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 1 year ago.
no
Expert:  George H. replied 1 year 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 1 year ago.
used, and it does not stay it fades out
Expert:  George H. replied 1 year ago.

What does not stay and fades?

Customer: replied 1 year ago.
the volt on the number three pin coming out of the control unit
Expert:  George H. replied 1 year 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 1 year ago.
the signal request changes
Customer: replied 1 year ago.
the signal changes on the request wire.
Expert:  George H. replied 1 year 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 1 year ago.
ok ill let you know what happens thanks
Expert:  George H. replied 1 year ago.

Great, please let me know if you have further questions

Thank you

Customer: replied 1 year ago.
good morning
Customer: replied 1 year ago.
I put in a new ac control module and still have the same problem
Expert:  George H. replied 1 year ago.

Good morning

Expert:  George H. replied 1 year 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 1 year 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 1 year ago.

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

Have you replaced the blower resistor?

Customer: replied 1 year ago.
let me check
Expert:  George H. replied 1 year ago.

OK

Customer: replied 1 year ago.
no the volt on pin #11 does dropp
Customer: replied 1 year ago.
does not drop sorry
Expert:  George H. replied 1 year 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.