CONDITION
POSSIBLE CAUSES
CORRECTION
(c) Vent at coolant pressure
container is plugged. Clean vent
and repair as necessary.
(d) Pressure container is internally
blocked. Clean and repair as
necessary.
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. For test procedure (Refer to
appropriate Diagnostic Information).
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.
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. Check for a Diagnostic trouble
code (DTC).
1. For procedures, (Refer to
appropriate Diagnostic Information).
Repair as necessary.
2. Coolant level low.
2. (Refer to 7 - COOLING -
STANDARD PROCEDURE) Repair
as necessary.
3. Obstructions in heater hose
fitting at engine or at heater core.
3. Remove heater hoses at both
ends and check for obstructions.
Repair as necessary.
4. Heater hose kinked.
4. Locate kinked area and repair as
necessary.
5. Water pump is not pumping
coolant to heater core.
5. 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. Replace
components as necessary.
6. Air trapped in heater core.
6. (Refer to 7 - COOLING -
DIAGNOSIS AND TESTING)
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.
CS
ENGINE
7 - 11
ENGINE (Continued)