Thread: issues with rear defrost and blower motor

blower motor resistor has been changed.. i belive it has to do with the ignition switch

Could be your ignition switch, it is a common problem. Affects blower settings 1-4 and rear defrost. Another common symptom is the key sticking in the ignition. It is caused by carbon build up on the contacts. You can either replace the switch or clean the contacts. I cleaned the contacts, and now everything works. I am a newbie for DIY projects, but I could follow the directions and get it to work. Check out this link, it is a good write up with pictures:

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