I'm new owner of 2002 Taurus SES. No climate control, When heat is on, air conditioning takes about 5 minutes to come on. Heat continues to blow through vents with all controls set to AC. When AC kicks in, I hear the blower door close (or open?). One time only, floored gas and AC kicked in immediately. When starting from AC, works fine ; when I switch to heat - fine, when going back to AC there's the delay. If I shut off engine, wait a minute and restart with AC its fine again. If you start with heat, its ok, but takes time to switch to AC. I can live with it, but is really annoying. ANy recommendations for Repair, replace or diagnosis. Thanks all

Do you have the EATC by any chance?

I bought a '02 SES "program car" when it was about a year old. It had been transported from another state and sitting for a few weeks here and there. The diverter door in the heat/A/C unit was sticking and doing similar things to what you are telling. I got away with simply "exercising" the heat/cool knob on the dash several times to get it working properly.

Hi and thanks for responding.
My car does not have EATC. FWIW its from midwest and has been in dry southern california for a few months.