ANSWERS: 2
  • You need to check for a possible vacuum leak between engine and heater controls.Maybe the plenim is not opening
  • you might want to check the electrical contacts on your directional controls. I found one on my 91 that was burnt,cleaned and straightend the contacts roughed them with some fine steel wool and it works...but be carefull removing the control panel,there is a metal shim inside that will fall out and as yet I cannot figure out where it goes but it has something to do with the directional operation because I no longer have a functional vent setting although the defrost and heater work fine.

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