Yesterday I changed the glow plugs and the fuse on the OVP. couple things got fixed and now I only have heat while the car is parked or driving under 15mph. As soon as I speed up I only get cool air. Anyone have any idea why this is happening? I also changed all the fuses in the box since I got the kit to change them all, maybe that had something to do with this? Another coincidence is now the AC works.