I have a 1989 tempo that suddenly decided to no longer allow air to come out of the panel vents. I did some troubleshooting, looked up as much info I could online and in Chilton's, and I'm currently almost to the point of completely taking the dash off. I'm hoping someone else with experience can help stop me from spending a whole day attempting that.
Basically, air will only come out of the Defrost and Floor.
-- If I choose AC/MAX AC/Panel Vents air will come out of the Window Defrost vent.
-- If I choose Defrost it will come out of the Window Deforst Vent.
-- If I choose Floor it will come out of the Floor vents.
This happens for both heat and cold.
I have come to the conclusion that it is either a vacuum problem or somehow related to the vacuum lines.
Behind my glove compartment are 2 vacuum lines, one black and one white. They are both fastened tightly and do not appear to be leaking. I have not disconnected one yet as I am unsure of if that will cause any other problems. Is it safe to remove one of them from the connector while the car is running?
If there are only two lines, would the Window/Floor switching seem to indicate that these lines are fine, or could one of them be the culprit?
Also, has anyone ever pulled out the heating/ac control unit from the panel? I have the tools to remove my radio, and the unit has the same holes. I can pry it out a little with those tools, but I get enough resistance to be afraid to try to pull it out any farther. Does the switch (between various degrees of hot/cold) need to come out first, or is there anything I'll break by pulling this out?
I just want some reassurance that I've tried everything I can before taking apart the whole dash. Any tips would be appreciated, including on if it's safe to disconnect one of the 2 vacuum lines behind my glove compartment while the car is running. I figure I could use my finger simply to check if any exchange is taking place.
Thanks