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Thanks for taking the time to help.
Yes we have driver side heat, all we have on the passenger is full cold air, AC is very cold , can't blend the air like you can on driver side.
I believe the problem may lie with the air blend door based on other threads I have read.
Personally, I'm leaning toward the control head. It was very common for the temp slider to go bad so when you slid it back and forth, the resistance wouldn't change. On a 2000, you'd have to check it with a scan tool.
I got a control head and tried it , same results, I am noticing that when the test is running and the driver side changes temperature, the passenger side stays cold and never changes.
I think it may be the air blend door.
Anyone know how to change it out.
I had the dash out last year to replace the condenser for the A/c, so I checked the electrical connections and they are good.