I don't drive our '09 often, but happen to have it over the weekend. I noticed the air coming from the vents in the rear is cold when the temp control is on full heat. The front temp control is also on full heat, the rear controls are enabled at the front, I checked anti-freeze level and it is full.
I did a search on here to see if anyone else had a similar issue, but had only two hits and they were no help. Thought I would see if anybody else experienced this?
And there's probably a check valve at the compressor end in case one blows... or freezes, no? I'm not questioning you, just curious and trying to find a solution for the OP.
Just my .02. Cycle the rear heating control through all the temp range, and modes. I had an issue with my 08 where the upper vents blew cold, sometimes even after the warm coolant should have been warming up the rear. I had to cycle through all the settings and then it got warm.
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