I have a 1977 Buick with a 350 CID Olds engine in it. It has been setting up for a while. I started it the other day and after a few minutes a valve stuck. I shut it off and closed the hood. What ...

Part 1 in this series covered defrost cycle problems in heat pumps. Now, let's discuss the second major winter issue: heat pumps stuck in one mode. The customer calls and says the system won't switch ...