CONDITION POSSIBLE CAUSES CORRECTION
INADEQUATE AIR CONDITIONER
PERFORMANCE (COOLING
SYSTEM SUSPECTED).
1. Radiator and/or A/C condenser is
restricted, obstructed or dirty
(insects, leaves, etc.).
1. Remove restriction and/or clean
as necessary.
2. Electrical radiator fan not
operating when A/C is operated.
2. Refer to appropriate Powertrain
Diagnostic Procedures manual for
test procedure. repair as necessary.
3. Engine is overheating (heat may
be transferred from radiator to A/C
condenser. High underhood
temperatures due to engine
overheating may also transfer heat
to A/C components.
3. Correct overheating condition.
Refer to procedures in this section.
4. all models are equipped with air
seals at the radiator and/or A/C
condenser. If these seals are
missing or damaged, not enough
air flow will be pulled through the
radiator and A/C condenser.
4. Check for missing or damaged air
seals and repair as necessary.
INADEQUATE HEATER
PERFORMANCE.
1. Has a diagnostic trouble code
(DTC) been set?
1. Refer to the appropriate
Diagnostic manual. Repair as
necessary.
2. Coolant level low? 2. Refer to Cooling System Testing
in this section. Repair as necessary.
3. Air Trapped in heater core. 3. Improper coolant fill procedure.
Refer to Cooling System Filling in
this section.
4. Obstructions in heater hose
fitting at engine or at heater core.
4. Remove heater hoses at both
ends and check for obstructions.
Repair as necessary.
5. Heater hose kinked? 5. Locate kinked area and repair as
necessary.
6. Thermostat possibly stuck open. 6. Refer to Diagnosis and Testing,
Engine Thermostat in this section.
7. Water pump is not pumping
coolant to heater core. When the
engine is fully warmed up, both
heater hoses should be hot to the
touch. If only one of the hoses is
hot, the water pump may not be
operating correctly.
7. Refer to Water Pump procedures
in this section.
HEAT ODOR 1. Various heat shields are used at
certain driveline components. One
or more of these shields may be
missing.
1. Locate missing shields and
replace or repair as necessary.
2. Is temperature gauge reading
above the normal range?
2. Refer to Temperature Gauge
Reads High in these Diagnosis
Charts.
LH COOLING SYSTEM 7 - 13
DIAGNOSIS AND TESTING (Continued)
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