Front air warm, rear air cold
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Front air warm, rear air cold
I have a 2000 Durango, 5.9L engine with front and rear air. The front air blows warm, even on the max cold setting. It seems like air volume may be down too. The rear has cold temp and operates okay. It is almost as if some of the damper/blend doors are not opening or closing to the right positions. If the rear is cooling I cant's see how compressor or coolant charge is at issue. I did have the coolant charged and the shop indicated that it was only slightly low. They said they have seen this before and it is something to do behind the dash and that it was expensive to repair, they hinted at $1K. Time to ask the forum for help. I am not afraid to dig in, but want to know how deep first. H-E-L-P 
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Joined: Feb 2009
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First, check the coolant lines running into the rear section of your truck. They tend to be located at the far rear passenger side and run from underneath the outside up into the rear interior. If the "in" and "out" lines are both warm/hot, then the core is not blocked up, and there is another problem.
In my 2001, the problem was that the blend door that diverts air either through the A/C condenser or the heater core was broken (it had snapped at the connection to the servo and just "fell" closed).
I picked up a spare servo and door at the junk yard and was on my way. I decided to replace the servo and the door because my original servo broke the first door, so I figured I'd just match up parts that worked together in another truck (perhaps my servo was a little too strong or something). It does require that you disassemble the rear passenger interior paneling and get into the duct work, but it's not terribly difficult if you have some time to work with (far easier than tearing into the dash for no reason).
In my 2001, the problem was that the blend door that diverts air either through the A/C condenser or the heater core was broken (it had snapped at the connection to the servo and just "fell" closed).
I picked up a spare servo and door at the junk yard and was on my way. I decided to replace the servo and the door because my original servo broke the first door, so I figured I'd just match up parts that worked together in another truck (perhaps my servo was a little too strong or something). It does require that you disassemble the rear passenger interior paneling and get into the duct work, but it's not terribly difficult if you have some time to work with (far easier than tearing into the dash for no reason).
Only two possibilites. The H Valve may have gone bad for the front system. Or you have a blend door that is not properly shutting down.
Either of these issues, will require you to completely tear down the dash to gain access to the HVAC box to address both issues.
While you got the assembly out, inspect and replace the heater core as neccessary to save you from performing a repeat dash tear down to fix the heater core. Heater core and HVAC assembly are all in the same area.
Either of these issues, will require you to completely tear down the dash to gain access to the HVAC box to address both issues.
While you got the assembly out, inspect and replace the heater core as neccessary to save you from performing a repeat dash tear down to fix the heater core. Heater core and HVAC assembly are all in the same area.
