SOURCE: 1999 Chev Suburban 1500 with front and rear ac -
the truck has two evaporator cores one for the front unit one for the rear unit also two expansion valves, one for the front one for the rear.
check the large a/c line going to the rear unit if the line is warm with the A/C compresser running replace the rear expansion valve.
if the line is cold then replace the rear units blend actuator motor. if the frount unit is cold then most likely the blend actuator is the problem, remove the cover from the rear unit and you will see the actuator mounted on the side of the air handler box.
the best way to indentifie the unit is to buy one so you know what your looking for.
let me know if there is any thing else you need.
SOURCE: malibu heating and ac
does the car have automatic climate control?
Testimonial: "2.3 eco-tech 2005 Malibu it is not the classic style I went to all three areas for a blown fuse/relay nothing... Now I have also replaceded the entire climate control unit. The car has sat for a couple of years wires are all in tact no chewing of wires etc... ac worked before plenty of freon air temp coming out of the vents is always the same no materer what temp I set it to full cold full hot air temp the same... still no movment when trying to change to windows floors foot vent only vents blow air... the blower hits on all speeds. I have disco'd the batt and reconnected it nothing am at a loss. Hope you can help John... whats left? I put my hand on the central air until and change the settings I do not feel a gear turn or any movment from inside... Thanks"
As
per your problem mentioned. There are few solved help links to
troubleshoot these problems. Go through the list and Click the link below:----
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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html
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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html
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http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html
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These will help.
Thanks.
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