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  #1  
Old August 19th, 2013, 15:43
YFZsandrider YFZsandrider is offline
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replaced heater core, now blower motor problem

I just went through all the work of pulling the heater box to replace the heater core and evaporator, after getting it all back together, I took it by the ac shop to have them service the system, not even thinking to make sure the heating and cooling functions work first....

Long story short, they filled the system with refrigerant, and when they went to test it, the fan wouldn't come on and the blower motor started smoking.

What could it be?
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Old August 19th, 2013, 17:25
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Tim_MN Tim_MN is online now
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Re: replaced heater core, now blower motor problem

All anybody else can do is guess as to the actual cause. You need to perform an inspection of the switch, wires, relay, fan motor, and resistor. Look for melted stuff.
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Old August 20th, 2013, 08:00
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Re: replaced heater core, now blower motor problem

Other than the smoking blower motor I had the same problem about a year ago. Had to take it to a dealer an hour away because neither I or my regular mechanic could figure it out, but it turned out to be the switch.
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Old August 20th, 2013, 11:28
YFZsandrider YFZsandrider is offline
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Re: replaced heater core, now blower motor problem

Any good info on a testing procedure for the fan motor, relay, and switch would be greatly appreciated!
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Old August 20th, 2013, 19:35
YFZsandrider YFZsandrider is offline
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Re: replaced heater core, now blower motor problem

Well, I pulled the resistor, and it smelled absolutely fried, so I replaced it. As as soon as I install the new one, and turn on the heater, no fan, and smoke starts coming from the heater box again. Any Ideas?
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Old August 20th, 2013, 20:26
joe_peters joe_peters is offline
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Re: replaced heater core, now blower motor problem

Yep.

Pull the blower motor and then hook it direct to the battery--sounds like it is fried.
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