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first check your fuses, switches, wires.
you should find the problem with lights checking these.
Now for the heater you still want to check the fuses, switches and wires.
Be sure the heater hoses are connected. I recently saw a used car that the heater core was bypassed.
is there any heat at all? are the vents blocked (I had this problem with leaves from sitting for a long time before I bought my Jeep).
there is a cable that runs from the dash to the heater core housing. This opens and closes a door that allows heat in, is the cable connected and working? There is a rheostat on the outside of the housing check the wires and condition. if there is obvious corrosion or damage replace this.
if you have some heat but not much it could be the fan it is located in the engine compartment on the passenger side.
if you need more help resubmit your question with the make model and year and what you have tried and I will try to help from there.
good luck
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