1996 jeep grand cherokee heater sometimes blows hot / cold air, is this a blend door problem? if so, can someone be kind enough to expalin how to fix the problem, thanks

in side the heater plenum behind the glove box i beleve

If the heater hoses are hot, the problem may be a faulty blend door under the dash. The blend doors direct air thru the heater core and the vents.

Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.

It sounds like you blend door is broken. It is about an 8 hour job to tear the dash apart and replace the actuators that control blending of hot and cold air under your dash.

Probably broken blend doors if everything else is working, but its just blowing cold air. Do a google search for "Jeep Blend Doors" or "Heater treater" for more info.

never done one ?? but from what you describe you have fitted an actuator arm back to front

hi
the blend doors are located behind the glovebox were you will find the heater box the doors are inside this, to remove the heater box you will have to take out the complete dash. try heatertreater.net they have a diy easy fix solution to replace damaged or broken blend doors, i have fitted a few off these kits all work fine with no problems..
hope this helps

it sounds like the blend doors within the heater casing are broken and this is an expensive repair to be carried out at a reputable repair garage

there should be a small valve attached to a hose coming from the engine into the firewall this valve directs the hot engine coolant into the heater radiator in the heater box it probably is closed open it and, you should have heat then: it should be easy to find the reason it was closed

U will need to replace the pass side air temp control blend door acuator motor.