It seems that a lot of folks have had the issue where no or little heat is observed blowing from the drivers side vent, but is good on the passenger's side.

The supposed fixes range from replacing the Heater Core to Replacing the air blender door actuators.

So, I figured I would take a poll and see who had which issue.

 

216,000 and 168,000, no heat issues.

 

07 with 115,000 miles. I've changed the coolant every two years though.

 

That seems to be the key. I just bought one with 90k on it and it seems to have this problem. Will be digging into it this week.

 

115000 miles

Never had issue. I did after purchase do the blend motor doors adjustment procedure. It's on the forums somewhere, press a few buttons etc.

 

In 2015, new to me '06 had limited heat to drivers side. Local rover specialist said to try a flush first before diving into the whole heater core replacement mess. I'd call it about 90% cured.

 

I have flushed multiple heater cores for that issue, replaced ZERO door actuators.

 

Had mine done and it seemed to be fixed but one day later it was the same? Should I flush it again? Tech said that not much sediment came out. Does it need to be done with a machine or is shop air pushing water good enough?

 

Machines are usually good for "coolant exchange". I've never seen one that actually knocked stuff loose and "cleaned" a cooling system. Really dirty systems usually require chemicals that you wouldn't want to put in a coolant machine.

When they did the flush, did they flush the core in both directions? I use water and air and I keep alternating directions. Backflushing gets the most debris, but I sometimes get some forward flushing as well, not to mention the change in flow direction helps dislodge debris.
Repeat cases may require rinsing out the block and possibly replacing the radiator. If the heater core keeps plugging up, then sediment has collected elsewhere in the system and is being re-distributed back to the core.

 

124,000 Miles