I have a 87 300d and the climate control has a mind of its own. I replaced the vacuum solonoid bar and its still not working properly. When i set it to defrost in the heat setting it blows cold. It also doesnt blow from the middle vents in ANY setting. When any of the other vent selections is pressed it just blows out from the two side vents and floor vents. Im thinking there is a vaccum diaphram problem or mabey the control unit is on the blink.... It there any diagrams available or suggestions. Anyone else have this problem?