I have a 2005 PT Cruiser and today the temperature light came on and the temperature gave dropped to ice cold? I am wondering if that means the thermostat is broken? I haven't just had work done and the car is running fine.
Sounds like your thermostat is stuck open. The fluid is not heating up. It's just cycling through the engine. Time to replace it. Car will run fine, but you will have no heat. Replace it sooner than later. If it closes on you, the car will over heat and leave you on the side of the road.
Overall: The fuel economy is not very good and the reliability is below average. A cramped engine compartment makes it difficult to work on; for example, to change the spark plugs, the top part of the intake manifold has to come off. The PT Cruiser doesn't hold the value very well and there are plenty of complaints about electrical, front-end and other problems.
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Kelly Little Ashford