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Originally Posted by eleveniron
..... drop the blower motor out (3 screws, the wire harness and the motor cooling hose). The resistor assembly is mounted in the bottom of the duct ..
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Question 1: I understand the blower motor is accessible from inside the car starting with the '97 ? Right?
Question 2: Do you have a button labelled "bi-level" in the '98 model? (it does not exist in the '90-96 model). THe "bi level" mode , when it exists, allows heated air to be directed to the floor while the upper vents are fed with cool air. The slave valve depicted is controlled by the mode buttons and according to the manual should be opened in the HEAT(floor) and DEF modes. THe SLAVE DOOR is precisely used to implement the BI-LEVEL function and when in closed position, it does restrict the air flow available from the heater core, and this would then be a logical explanation in your case. (not same as HI-LO mix function that directs air (cold or warm or in-between) simultaneously to the upper vents and to the floor.)
The mechanical drawings from the GM service manual I have do show the slave door, but this door does not exist in the electrical and vacuum solenoid set-up of same manual . It seems the manuals carry some drawings from a year mdel to the next while some changes are ignored .
MAke sure you report your findings and if possible, with photos...