Where is the HVAC box on a 2003 suburban ?

SOURCE: 2004 suburban rear a/c only blows hot air

ase mechanic:
there are separate actuators for the blend doors. one for heat and one for cool. they work opposite and in conjuction with each other, if that makes any sense. ones open, ones close, for each different climate. sounds like the the cold one isn't opening in the rear.

Marvin

• 85242 Answers
• Posted on May 12, 2009

SOURCE: front aircond. blows warm. Rear air is cold

this is caused by a defective temperature control blend door actuator motor. Don't overhcahrge the system, if one part of dual climate works ok the problem is not the compressor or the system charge

SOURCE: 2004 chevrolet suburban AC blows hot/cold at same time

You need to replace the drivers side temp actuator that is located on the left side of the HVAC box. It is retained by 3 screws and is fairly easy to replace.

SOURCE: Replace Blend door on 2004 Suburban

My problem is hot air on the drivers side, cold on Pass when the AC is on...2004 Sub

SOURCE: 2004 Chevy Suburban Z71 -

if you havnt done this before than its better to pay for it.1 door is posible.2 control switch also might not keep the signal to remain open possible problem on control panel.since other side works and rear.rule of freon shortage.sonds like door or switch.that is electric and need to test resistance on switch and power outlet possible going on and of opening and closing door.or door stuck open to heater side.and not closing all the way.need a expert to check it out.door breaks easy must be carfully.