Diagnosis And Testing - Heater; Performance; Heating & Air - Dodge Dakota Sport 2001 Service Manual

AN
HEATING & AIR CONDITIONING (Continued)
Condition
The low side pressure is too
high, and the high side
pressure is too low.
The low side pressure is too
low, and the high side
pressure is too high.

DIAGNOSIS AND TESTING - HEATER

PERFORMANCE

Before performing the following tests, refer to
Group 7 – Cooling System for the procedures to
check the engine coolant level and flow, engine cool-
ant reserve/recovery system operation, accessory
drive belt condition and tension, radiator air flow
and the fan drive operation.
MAXIMUM HEATER OUTPUT
Engine coolant is delivered to the heater core
through two heater hoses. With the engine idling at
Ambient Air Temperature
Minimum Air Temperature at
Floor Outlet
A/C Diagnosis
Possible Causes
1. Accessory drive belt
slipping.
2. A/C orifice tube not
installed.
3. Faulty a/c compressor.
1. Restricted refrigerant flow
through the refrigerant lines.
2. Restricted refrigerant flow
through the a/c orifice tube.
3. Restricted refrigerant flow
through the a/c condenser.
4. Restricted Filter Drier.
Temperature Reference
15.5° C
(60° F)
52.2° C
(126° F)
HEATING & AIR CONDITIONING
1. Refer to Cooling for more information. Inspect
the accessory drive belt condition and tension.
Tighten or replace the accessory drive belt, if
required.
2. (Refer to Plumbing/A/C Orifice Tube) in this
group. Install the missing fixed orifice tube, if
required.
3. (Refer to Plumbing/A/C Compressor/Removal/
Installation in this group. Replace the compressor,
if required.
1. (Refer to Plumbing/Caution - Refrigerant
Hoses/Lines/Tubes Precaution) in this group.
Inspect the refrigerant lines for kinks, tight bends
or improper routing. Correct the routing or replace
the refrigerant line, if required.
2. (Refer to Plumbing/A/C Orifice Tube) in this
group. Replace the restricted fixed orifice tube, if
required.
3. (Refer to Plumbing/A/C Condenser) in this
group. Replace the restricted a/c condenser, if
required.
4. See Filter-Drier in the Removal and Installation
section of the group. Replace the restricted
Filter-Drier, if required.
normal operating temperature, set the temperature
control knob in the full hot position, the mode control
switch knob in the floor position, and the blower
motor switch knob in the highest speed position.
Using a test thermometer, check the temperature of
the air being discharged at the HVAC housing floor
outlets. Compare the test thermometer reading to the
Temperature Reference Chart.
21.1° C 26.6° C
(70° F) (80° F)
56.1° C 59.4° C
(133° F) (139° F)
Correction
32.2° C
(90° F)
62.2° C
(144° F)
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