'95 Jimmy heater smell

When I run the heater I get a pungent, almost electrical smell from the heater. When I switch over to VENT, the hot air coming out does not have this odor. I've tried spraying Lysol in the intake slots for possible mold contamination...can't seem to get rid of the heater smell.

yea, I have it to, it is from the blower motor getting hot.