UNSTABLE CLIMATE CONTROL AND/OR TEMPERATURE DRIFT
VEHICLES AFFECTED: 1990 E-OLDSMOBILE TORONADOS
This bulletin has been revised to correct information in the repair procedure.
Some 1990 Oldsmobile Toronados may exhibit A/C-heater control instability or temperature drift. This condition may be caused by a loose, kinked, or disconnected aspirator hose.
To diagnose this condition operate the climate control at "high blower" speed with the right A/C outlet door in the Off position. Test aspirator draw by placing a small piece of tissue over the Oldsmobile script located above the glove box. If the tissue fails to remain in place, insufficient aspirator operation may be suspected. Refer to the repair procedure.
If the aspirator is functioning properly, refer to the 1990 Trofeo/Toronado Service Manual, section 1C "Climate Control System Check" for additional diagnosis.
To repair this condition:
1. Remove the glove box (4-7mm torx head screws at hinges). Inspect the aspirator hose for kinks and pinch points which may cause an air flow obstruction. Refer to Figure 1.
2. If aspirator hose is loose or disconnected at the in-car sensor, use the following procedure:
A. Firmly connect the hose to the in car sensor by pushing hose on to sensor duet while turning the hose in a counterclockwise direction.
B. Reinstall glove box and align glove box door as required.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.
