Question about 1993 Oldsmobile Eighty Eight

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1993 olds 88 royale. Was blowing warm air from the blower on the floor, could not turn it up or down or off with the knob. This continued for 2 months, didn't have AC either. Then Friday, I suddenly started getting AC from the blower! I did nothing, it just started blowing cold air, but this came with an elevated temp, up to 270 within 10-12 blocks, never had this happen before, car always had normal temp even with the blower stuck. Would this be a thermostat? What are the things I should check? And where in the heck is the thermostat on this car???? Can't see it!

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Check all vacuum lines and hoses in engine compartment/then behind controll head/,,the automatic control head could be malfunctial.

Posted on Jun 28, 2009

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Item Part Number Description 1 — Air inlet door 2 — Temperature blend door 3 — Headliner airflow 4 — Auxiliary mode door 5 — Floor airflow 6 18476 Heater core 7 19860 Evaporator core 8 19805 Blower motor
The auxiliary A/C and heating system has the following features:
  • The auxiliary A/C and heating system is functional whenever the instrument panel mounted A/C control is in any position except OFF.
  • The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system.
  • Air is cooled and dehumidified by the auxiliary A/C evaporator core only if the instrument panel mounted A/C control is adjusted to a position that requires A/C compressor operation.
  • The temperature blend door and the auxiliary mode door are controlled by electric actuator motors.
  • Movement of the auxiliary temperature control between COOL and WARM causes a corresponding movement of the temperature blend door to mix air flowing through and around the auxiliary heater core.
  • Movement of the auxiliary mode control between PANEL and FLOOR causes a corresponding movement of the auxiliary mode door to direct air flow between the panel (headliner) registers and the floor duct.
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I would say the auxiliary mode door (#4) electric motor is not wokring.

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Auxiliary Blend Door Actuator —Air Distribution Removal and Installation
  1. Remove the RH quarter trim panel cup holder and access panel.
  1. Remove the screws.
  1. Disconnect the blend door actuator electrical connector.
  1. To install, reverse the removal procedure.

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