GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC P42 Commercial Chassis 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Odor Diagnosis
Table 1: Musty Smell
Table 2: Coolant Smell
Table 3: Refrigerant Leak

Musty Smell

Problem

Cause

DEFINITION: There is a musty smell in the air conditioning (A/C) system.

Important: Under certain climate and operating conditions a musty order develops from mold growth in the evaporator core face. The odor is generally temporary. As climate conditions change, the odor will disappear and repair. If the odor persists, it will become necessary to remove the evaporator core and clean the face of the evaporator core with the appropriate cleaner.

There are water leaks in the body.

Seal the body.

The evaporator drains.

Clean the drain.

The evaporator has mold or mildew.

Clean the evaporator.

Coolant Smell

Problem

Action

DEFINITION: The air conditioning (A/C) has a coolant smell.

Anti-freeze
    • Heater core
    • Heater pipe/hoses

Refrigerant Leak

Problem

Action

DEFINITION: The air conditioning (A/C) has a refrigerant leak.

Refrigerant oil

Clean the evaporator core.