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Old 07-16-2019, 02:36 PM   #1
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2009 SE blower motor issue

Hello,

2009 SE. AC quit blowing last week in my girlfriend's Focus while she was out of town. Family friend replaced the blower motor. AC worked fine after. The last couple of days it is acting up again: surging up and down in speed. I replaced the resistor but the issue persists. More details:

Blower motor replaced
Resistor replaced
AC air is cold
Blower blows on all speed settings but surges up and down in speed, most dramatically on the highest setting.
Issue persists regardless of fan speed setting, AC button setting, Max AC button setting, or temp knob position.

What is the next likely thing to check? The fan speed switch/knob cluster? Thanks


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Old 07-16-2019, 04:36 PM   #2
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Just because you said it was surging I would check your voltage at the battery when it is running.

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Old 07-17-2019, 08:30 AM   #3
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Thanks. This would tell me whether the issue is the battery?

Maybe surge isn't the best word. The blower motor speeds up and slows down rapidly regardless of setting.
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Old 07-17-2019, 06:50 PM   #4
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Problem is most likely not the battery. You either have a poor ground (at G200 or between G200 and the HVACM) or a failure of the HVAC module (main control head in the dash):

Paul
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2009 SE blower motor issue-2009-hvac.jpg  

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Old 07-17-2019, 06:58 PM   #5
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Bad ground absolutely could do it.
Could also have a bad connector.



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Old 08-14-2019, 05:06 PM   #6
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Quote:
Originally Posted by Paul1958 View Post
Problem is most likely not the battery. You either have a poor ground (at G200 or between G200 and the HVACM) or a failure of the HVAC module (main control head in the dash):

Paul
Thanks for the help. I printed the diagram you attached and held it in from of me as I looked behind the glove box but the car didn't much look like the diagram (kidding). Nevertheless, tracing a bad ground seems to be beyond my knowledge/skill. I did remove the control head in the dash and found that the four-prong plug on the back of the fan switch was slightly melted and one of the prongs was discolored (upper-right, if you're looking at the back of the control head) . I replaced the control head and plug and the blower blew steady for a few days but now it's back to the original problem. I'm assuming there's an electrical problem somewhere that eventually overloads (or whatever) the fan switch and control head but I don't know how to proceed. If there isn't a way for *me* to to run down the problem is it best to take a problem like this to a Ford dealer or is a local auto repair place ok?
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