My '98 E350 Cube Van has a problem with the heater. The fan still works fine but the air blows cold. Any suggestions?

 

Check the cable to the blend door and make sure the the heater control valve under the hood is getting vacuum.

 

Thanks, can you tell me where under the hood the control valve is located? I would like to make sure the vacuum hose did not come loose or fall off. Is the cable to the blend door located under the right side of the dash?

 

yes on the cable, the control valve is located near the heaterbox under the hood in one of the line going to the heater core. YOu will more than likely have to remove the air cleaner box to see it.