I'm having some issues with the HVAC system on my 1973 6-cylinder Wagoneer, and was wondering if anyone here would have any insight into the problem.
As recently as a couple months ago, everything appeared to work correctly. The heat would blow hot, and the fan would, well, it would circulate the air at least. Now, when I turn on the fan, I get nothing out of any of the vents (that is, the defroster vents under the windshield and the heater behind the gearshift, under the dash). I checked the blower motor and it is working fine.
I have two ideas for what it could be. 1) Something is clogging the HVAC hoses behind the dashboard. This is plausible because my Jeep sat dormant for 20 years before I bought it. However, since the fan blew air in the cabin when I bought it, I feel like this is not the problem. 2) The buttons to control whether the HVAC is off, on heat mode, or on defrost mode might be sticking, causing the hoses to all be closed. This is possible I believe, but does anyone have some sort of diagram that shows how those buttons actuate their respective controls? I'm not sure how it works and I'd like to have some idea before I start tearing apart the dash.
Has anybody else run into problems like this before? Any suggestions or insight is much appreciated. By the way, the Jeep doesn't have air conditioning. Thanks everyone!