NO HEAT

Last month I had no heat. Took it to a shop and they ran some acidic cleaner through it for an hour. A couple days ago I lost heat again and my Jeep was running at 200 degrees. Now it is running 220 and no heat. Can a plugged heater core cause the temp to rise or is it my water pump?

could be a plugged core or a faulty blend door actuator. there is a motor that flips the door inside the HVAC box from the AC side to the heat side and when it goes out you get one or the other.