Totallyrad

Low refrigerant should not interfere with the door operation.

billie

I didn't expect the low refridgerant would do it directly but maybe that a sensor might direct the output to the driver under low performance. Just a question, we suspect the control in the dash since all the parts work otherwise.

Does anyone know if there is a difference in the devices for single and dual side dash control? The dash is single but the parts below are dual side blend doors. Could the control have been changed to the wrong one some time before he bought it?

Phil E.

Billie,

Did your friend cut the blend door out or take everything apart? I thought that I had to have a blend door issue with the difference in temp but the blend door was fine. There is an upper blend door and the bottom follower door. Usually only the main (direct motor driven door is the problem).

If you cut out the blend door opening like you do in the heatertreater instructions you can run the ac and see the inefficiency in the evap core by touching it or with a temp gun. The way all of the ducting works on these the evaporator is cold that blows into the driver side channel and a lot warmer on the passenger side. Ait is blowing equally hard through the evap but the cold is gone towards the firewall side which is what is directed at the passenger air tunnel.

From what I have learned, everything is the same for the single and dual control except that in the dual control another motor controls that passenger doors. No sensor directs to the driver. It is just that the drivers air blows over the evaporator side that is cool and this is the air the driver gets. Once the air gets past the blend doors the passenger and driver air does not mix.

Once you cut one of these open and observe what is happening it is easy to understand what is going on. Before I saw it I thought that it had to be a blend door problem.

billie

I'm going to start a new thread. My apologies to the OP for the hijack.