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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: tigwelder on November 10, 2013, 08:33:02 pm

Title: blower motor ?
Post by: tigwelder on November 10, 2013, 08:33:02 pm

1985 K 20 factory air. blower motor only works on high . had 3 speeds a month ago.any ideas?

Title: Re: blower motor ?
Post by: Jason S on November 10, 2013, 09:05:24 pm

Have you checked the connections at the resistor?

Title: Re: blower motor ?
Post by: tigwelder on November 10, 2013, 09:36:30 pm

No, where is it located? thanks

Title: Re: blower motor ?
Post by: Jason S on November 11, 2013, 07:19:57 pm

The resistor is located under the hood on the top side of the a/c evaporator housing.   

Title: Re: blower motor ?
Post by: tigwelder on November 12, 2013, 08:49:58 pm

I WILL CHECK IT..

Title: Re: blower motor ?
Post by: Jason S on November 12, 2013, 09:50:32 pm

Also, you may want to move and slightly wiggle the fan blower speed switch between fan settings on the HVAC control.  The contacts within the switch may have a bit of corrosion, especially if the blower fan switch hasn't been operated in a while. 

FYI- I had similar issues arise this morning...