From the Googling that I've done, this is a problem that occasionally comes up and has been addressed on this board plenty of times. I've got a different question about a possible different approach to solving it. I just need some input. I've got a 2002 Liberty (V6 3.7L with A/C, Auto, Sport) with very lukewarm heat coming from the vents. Things that I have already tried are:
- Made sure the coolant reservoir is topped off.
- Replaced the thermostat.
- Flushed the heater core.
- New radiator (from a different issue that required it...)
Also, the blend door does seem to move somewhat. There is a noticeable change in temp from the vents when I select full cold as opposed to full hot. I'm convinced the problem is with the blend door actuator itself or the stupid little plastic door flap that the actuator moves. Assuming it's the blend door, there's going to be a lot of work involved tearing out the dash to get to it to fix it. Good God, I really do not want to get into that. I want to try a hack job where I drill an access hole in the HVAC housing and manually force the blend door into heat mode and leave it there. A temporary hack job that will get me through winter. Just like this guy did here with his Grand Cherokee (thank you Google for always including this near the top of every search that I've done
My question is.... Where in the housing should I drill? This question is targeted to those folks that have gone all the way with a heater core replacement or a blend door replacement. To anyone that has taken out and opened up the HVAC housing and has good knowledge of its guts. I have a Haynes manual and the official FSM, but I'm still uncertain of it's layout. I need to safely drill into an open area just beyond the blend door but close enough where I can stick a tool or a finger in to manipulate the door.