My 93 XJ is only blowing out the defrost no matter what position the switch it is, what's the deal? Thanks for the help guys

 

vac leak or the vac bottle under the passenger side of your bumper is cracked that whatwas wrong with mine

 

X2 on the vacuum hose under the front bumper. The same thing was wrong with mine last year. Also, if your cruise control isn't working well, this is the likely source. Cruise and heater vent settings are both controlled by vacuum pressure.