Why does my car roll when I put it in Park? Welcome to Mercie J auto care, where compassion and craftsmanship come together. I'm Rick Smith, master certified technician. I'm going to try to answer that question for you today and I’m assuming that the question is why does my car roll just a little bit, not keep rolling.

Radiator failures are frustrating and one of the things that frustrates people the most is that they can come on for no apparent reason.

What is an oxygen sensor? Welcome to Mercie J auto care, where compassion and craftsmanship come together. I'm Rick Smith, master certified technician. Well an oxygen sensor or an O2 sensor, basically what it does is it screws into the exhaust.

What is a catalytic converter?

One of our viewers asked, how do you test an expansion valve?

The question of the day is "How can I tell if my condenser is plugged?