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#1 (permalink) Old 07-30-2013, 05:42 PM
 
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AC / heater fan

My main AC / heater fan switch in the centre of my dash of our 2008 Smart Pure is only working on the number 4 ( high setting) At 1,2 and 3 the fan does not blow for AC or heater.

My dealer got me to put in a new ac / heat fan control unit ($ 565 part and labor). The fan still only works on the high setting.

HELP.
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#2 (permalink) Old 07-30-2013, 08:32 PM
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Ouch!! If it was mine, I would go back to the dealer and tell them you want your money back!:eek: It is obvious their diagnosis was wrong and did not fix the problem. There are numerous posts on here regarding fan/blower motor problems. If you are not a DIYer, then ask the dealership to try and actually fix the problem this time.

Maybe this will be helpful Heater blower motor repair

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#3 (permalink) Old 07-30-2013, 09:51 PM
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Sounds like an issue with the heater speed resistor array. It is plugged into the plenum for heat dissipation down near the heater fan. There is a resistor for each of the lower speeds. The selector switch feeds current to the different resistors which dissipate enough power to run the fan at a lower speed. If the resistor array is broken at the common end it is possible for the direct connection that did not go through the resistor array to still work. I would take the heater resistor array out for a visual inspection. You may be able to see a break in it. I believe it is a ceramic based power resistor.
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#4 (permalink) Old 07-31-2013, 07:26 AM
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Quote:
Originally Posted by Harley's View Post
My main AC / heater fan switch in the centre of my dash of our 2008 Smart Pure is only working on the number 4 ( high setting) At 1,2 and 3 the fan does not blow for AC or heater.

My dealer got me to put in a new ac / heat fan control unit ($ 565 part and labor). The fan still only works on the high setting.

HELP.
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#5 (permalink) Old 07-31-2013, 01:53 PM
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Sounds like a misdiagnosis, doesn't it? The blower motor is fed power from the SAM fuse 4. The blower motor is grounded through the blower resistor and the fan speed switch in the hvac control unit. It seems like a simple matter to check for the ground from the fan switch, or conversely, check for power at the blower resistor connections. If no power is coming through the resistor then replacement of the controller will not fix anything. This is not sub-atomic particle physics, it is a simple electrical circuit.

One is led to wonder how they replaced the controller and did not ensure the fan worked correctly. Sounds like you are due a refund and a do-over.
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