Older PT Cruisers likely used R-134a, which is a common refrigerant. However, later models might have used a different refrigerant. Never attempt to guess. Using the incorrect refrigerant can damage the system.
To find the correct refrigerant, you should:
* Check your owner's manual: This is the best source of information.
* Look for a sticker on the underside of the hood: Many vehicles have stickers detailing the refrigerant type and other AC system specifications.
* Consult a qualified mechanic: A professional can properly identify the refrigerant type and service your AC system safely.
Do not attempt to recharge or repair your AC system yourself unless you are a qualified technician. Improper handling of refrigerants can be dangerous.