Join Date: Sep 2010
Location: Coquitla, BC
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Hi all - I had the same issue with my blower motor a few winters ago on a '07 MO. I think the blower is supposed to come on after 90 seconds even in cold weather. If it takes excessively longer to come on, most likely it could be the blower motor relay. That was my issue. It would not come on for a good 5-10 mins.
The one way to tell if it is the relay is to switch up the two blue relays behind the fuse block. One relay is for the blower motor, the other is for the accessories (display screen, radio screen etc). Assuming the display screen works, if you switch up the blower motor and display screen (accessory) relays and the display screen goes blank immediately when you start the car, then you know the blower motor relay is bad and you should replace it. After a while, the display screen will come on when the bad relay kicks in. The relay is not too expensive at the dealer ($20-$25) in fact it is cheaper at the dealer than NAPA. The dealer also had a cheaper alternative ($3) and I bought 2 of these as a back up.
It's pretty straight forward. 15 minute job as was mentioned above.
1) Remove the 4 screws holding the plastic kick panel under the steering column.
2) Remove the 2 engine latch release bolts (10mm)
3) Remove the 2 fuse panel bolts (10mm)
4) Carefully remove the trim panel
5) Carefully pull out the fuse panel.
At the back of the fuse panel you'll see 2 blue relays: for a '07 MO the top one is for the blower motor the bottom one is for the accessories (display screen). Look at the PDF files in the thread above from Zero Cool.
If this does not work, then maybe it's something other than the relays.
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