My 95 jeep grand cherokee wont blow air out of the front vent only on bottom vent and defrost

On most vehicles today ,there is a electric motor that works the vents .
sounds like it might need to be replaced.
it is usually under the dash....bolted to the heater box.

hope this helps.

grand cherokee heater blend door repair

Here's a link to a possible solution.

you have a vacum line lose under the dash for the heater or the switch is dirty

Check for a vacuum leak under the hood & under the dash.

not at all. That its a different problem you have. blower motor or vents in general, and gas pump have nothing in comun.

vents only blow out defrost

its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

there is a flap to redirect the air flow under the dash, it may be an item like a pen :) that has dropped down the vent opening stopping it from moving to redirect the air ... failing that, one of the motors/cables that operate the flap has failed

There is a flap that directs the air. the flap is controlled by a vacuum actuator. This is located inside the venting. The actuator is connected to little vacuum hoses that attach to the temperature control switch. Either the flap is stuck, or the actuator has gone bad.

There is a vacuum leak under the hood somewhere. Check the vacuum at the speed control servo. If there is no vacuum on the line with the engine running, follow the line to find the leak. The vacuum reservoir is mounted under the battery tray. I would look in that area after confirming no vacuum at the servo.