A/C System - Odor Primarily Upon Start Up: Overview

File In Section: 1 - HVAC
Bulletin No.: 91-12-04
Date: September, 1994

Subject:
A/C Odor Primarily upon Start Up in Humid Climates (Service Procedures)

Models:
1985-93 Cadillac Fleetwood
1985-94 Cadillac DeVille
1986-94 Cadillac Eldorado, Seville
1987-93 Cadillac Allante
1994 Cadillac Concours

This bulletin is being revised to include the 1994 models with an afterblow mode and to add procedure "D". Previous divisional publication numbers were:

Cadillac T-93-75A

GM of Canada 93-1B-121

Condition

Some owners may comment on odors emitted from the air conditioning system primarily at start up in hot, humid climates.

Cause

This odor may be the result of foreign material in the heater/evaporator case and/or microbial growth on the evaporator core.

Correction

To address this condition, use the attached "Chart A:" in accordance with the year and model of the vehicle to choose the appropriate procedure(s).