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Both my heater & A/C are not blowing hot/cold when I'm at idel at stop lights, ect. At speed they blow hot/cold just fine. However at idel the temp. seems to drop or rise to the outside temp. & thats what blows through the vents. Last April I had my A/C serviced, recharged the whole bit... so I assume it should be in good shape. Anyone have an idea what may be causing this problem? Thx
 

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Welcome aboard,This kinda stuff is for a shop to do...

1. the system needs to be evacuated of all the freon.

2. replace the orfice tube (expansion valve).

3. Pull a vacuum on the system for about 45 minutes.

4. Check for vacuum leaks.

5. If no leaks, recharge the system with the exact amount of freon.
 
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