Why does the heat on my 2002 Chevy Malibu only run on 'high'?

there is a low and high speed fan relay,seems your low speed relay is bad.under the hood is a black electronics control panel, usually on the driver side fenderwell,remove cover,look for it on diagram,it'll be a silver plug in about 1 1/4 by 3/8 inches.call local parts store,ask for low speed fan relay,only cost a few dollars,replace.
 
there is a low and high speed fan relay,seems your low speed relay is bad.under the hood is a black electronics control panel, usually on the driver side fenderwell,remove cover,look for it on diagram,it'll be a silver plug in about 1 1/4 by 3/8 inches.call local parts store,ask for low speed fan relay,only cost a few dollars,replace.
 
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