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Heater intermittently stops working.


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3 replies to this topic

#1 OFFLINE   tmaxx

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Posted 09 January 2017 - 09:50 AM

I have a 2010 Ford Fusion Hybrid.  I live in Indiana, so a heater is essentially during the winter months.  A few days ago my heater stopped blowing heat.  There was a very small amount of heat coming out of the vents even on max setting.  I tried swapping out the heater blower relay with the rear defroster relay in the engine compartment relay box.  When I swapped the relays, the heater fan started working agan.  I then swapped the relays back to the original configuration and the heater was still working so I wasn’t sure what to conclude.  I drove the car for a few more days and the heater worked fine.  This morning, I started my car for work and the heater turned on momentarily and then nothing except for a very small amount of heat on max setting.  I started off to work and about half way into my drive (20minutes), the heater came on full and worked for the remaining drive.  So it seems the heater fan is intermittently working.  Any ideas on how I could troubleshoot this or what I should look at replacing?  It’s going to get very cold here in Indiana soon, so I don’t want to end up losing heat again!  Thanks.

One other thing that may or may not have anything to do with this is that I periodically can hear liquid gurgling in the dashboard...


Edited by tmaxx, 09 January 2017 - 09:54 AM.








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#2 OFFLINE   eGuru

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Posted 09 January 2017 - 08:34 PM

Start by checking the connector and wires for the blower 'resistor' to see if they have over-heated.

 

Next time the blower stops, measure the voltage across the terminals (don't measure wrt  ground - go right across the terminals).

If the reading is low at the maximum speed setting, measure from the GY wire to ground. A high reading indicates a bad 'resistor'



#3 OFFLINE   tmaxx

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Posted 10 January 2017 - 08:21 AM

Start by checking the connector and wires for the blower 'resistor' to see if they have over-heated.

 

Next time the blower stops, measure the voltage across the terminals (don't measure wrt  ground - go right across the terminals).

If the reading is low at the maximum speed setting, measure from the GY wire to ground. A high reading indicates a bad 'resistor'

 

I am not sure that I have the blower resistor since I have auto climate control.  I think I have a blower control module rather than a resistor.  Does this sound correct?



#4 OFFLINE   drolds1

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Posted 10 January 2017 - 01:45 PM

This has been discussed in this topic before.  Start here.

 

And yes, there is a resistor.  ACC does not eliminate the need for that.  It's still a multi-speed blower, ACC or not.  It's just a different part from the one used with manual CC.  Motorcraft part #  8E5H 19E624 A.  The difference is that the latter part has a large heat sink on it while the former does not.

 

 






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