Did You check the delay valve???? If it's ok
check to see if you have vacuum at the the hvac programmer (box on right hand bottom of dash attatched to hvac case, black vac line, I think)
If thats ok, check to make sure the temp door link hasn't come loose from the actuator. Should be able to acess it by removing glove box. If all that is ok, your problem is most likely the hvac programmer assy.
"mean"
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