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Discussion Starter · #1 ·
For a long time now we have had trouble controlling the heat on Mom's '06 Grand Caravan. Sliding the (driver/passenger split) controls from cold to hot or back or inbetween would do nothing unless we slid it back and forth several times first. Recently I also noticed that the air selector (panel-vent/floor-heat/defroster) was also not working right (turn it and no change). Dad just replaced the control unit today with a reconditioned one and it seems to have helped a little but not completely.

What else is going on and how can we fix it?
 

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For a long time now we have had trouble controlling the heat on Mom's '06 Grand Caravan. Sliding the (driver/passenger split) controls from cold to hot or back or inbetween would do nothing unless we slid it back and forth several times first. Recently I also noticed that the air selector (panel-vent/floor-heat/defroster) was also not working right (turn it and no change). Dad just replaced the control unit today with a reconditioned one and it seems to have helped a little but not completely.

What else is going on and how can we fix it?
Under the dash behind a plastic panel there are three electric blend door actuators that control the air flow or doors, there are some great YouTube videos on checking and replacing them here is a link to a good one: 2005 Dodge Grand Caravan MODE door actuator
 

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Discussion Starter · #3 ·
Last weekend we got the actuators changed but it didn't seem to improve it much if any. After changing the control head and actuators, we still have to jiggle the controls to get movement to what we want (more or less heat, different direction, etc). Any other ideas to cure this?

BTW, taking the seat out to make room to work on the rest, one of the seat bolts broke loose from its tack welds as we fought the rusted threads. Also, we had to fight the spare tire hoist to get the tire cranked down to get at another one of the bolts, then we couldn't get it reeled back in more than half way, so we removed the hoist to try cleaning and lubing it up in the spring, then we might reinstall it. Stow and go seats make the spare more inconvenient to get out (between the front seats).
 

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Discussion Starter · #4 ·
As stated, changing the control head and the actuator motors had no apparent effect on operation. We tried calibration procedures found online as well as those obtained from a dealer. None of this has helped. Does anyone else have any ideas on what is wrong and how to fix it? I have tried reading ODB codes and can find nothing even related to the HVAC system other than the engine temperature reading.
 

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Discussion Starter · #5 ·
Planning a long trip (2400 miles) this spring,we finally took it (100 miles) to the nearest dealer. After several hours in the shop they finally found the cause of the problem. A short in the rear unit was confusing the computer, putting it into "safe mode" and also took out one of the front actuator motors (mode).Hopefully we'll have the vehicle back and working correctly this coming week.

One little complication in the last year or two, the AC had quit working. Once we got it on a lift,I found a bolt had fallen out and the compressor clutch pressure plate fell off. We replaced the clutch before even considering taking it to the dealer. The kit included a new pulley but with that the belt wouldn't line up so we reused the old pulley. All we would have needed was the plate and bolt but as cheap as the kit was, we got the magnet, pulley, plate and bolt (and shims). It was a bother getting the magnet unplugged.
 
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