When i start my2003 pt cruiser there is a smell from heater or ac vent?

A smell coming from the heater or AC vent in your 2003 PT Cruiser could be caused by a few issues. Common culprits include mold or mildew buildup in the HVAC system, which can occur if moisture is trapped inside. Additionally, it might be a sign of a coolant leak or a problem with the cabin air filter. It’s advisable to inspect the system or have a mechanic check for any underlying issues.