Heater Performance Test - DaimlerChrysler SPRINTER2006 Service Manual

VA
Condition
The low side pressure is
normal or slightly low, and
the high side pressure is too
low.
The low side pressure is
normal or slightly high, and
the high side pressure is too
high.
The low side pressure is too
high, and the high side pres-
sure is too low.
The low side pressure is too
low, and the high side pres-
sure is too high.

HEATER PERFORMANCE TEST

Before performing the following tests, perform the
ATC Function Test using the DRBIII
Cooling for the procedures to check the radiator cool-
ant level, serpentine drive belt tension, radiator air
flow and the radiator fan operation.
Possible Causes
1. Low refrigerant system
charge.
2. Refrigerant flow through the
A/C evaporator is restricted.
3. Faulty A/C compressor.
1. A/C condenser air flow re-
stricted.
2. Refrigerant flow through the
receiver/drier is restricted.
3. Inoperative radiator cooling
fan.
4. Refrigerant system over-
charged.
5. Air in the refrigerant system.
6. Engine overheating.
1. Accessory drive belt slip-
ping.
2. Faulty A/C expansion valve.
3. Faulty A/C compressor.
1. Restricted refrigerant flow
through the refrigerant lines.
2. Restricted refrigerant flow
through the A/C expansion
valve.
3. Restricted refrigerant flow
through the A/C condenser.
and refer to
HEATING & AIR CONDITIONING 24 - 5
1. See Refrigerant System Leaks in this
group. Test the refrigerant system for leaks.
Repair, evacuate and charge the refrigerant
system, if required.
2. See A/C Evaporator in this group. Replace
the restricted A/C evaporator, if required.
3. See A/C Compressor in this group. Re-
place the A/C compressor, if required.
1. Check the A/C condenser for damaged
fins, foreign objects obstructing air flow
through the condenser fins, and missing or
improperly installed air seals. Clean, repair, or
replace components as required.
2. See Receiver/Drier in this group. Replace
the restricted receiver/drier, if required.
3. Test the radiator cooling fan and replace, if
required. Refer to Group 7 - Cooling.
4. See Refrigerant System Charge in this
group. Recover the refrigerant from the refrig-
erant system. Charge the refrigerant system
to the proper level, if required.
5. See Refrigerant System Leaks in this
group. Test the refrigerant system for leaks.
Repair, evacuate and charge the refrigerant
system, if required.
6. Test the engine cooling system and repair,
if required. Refer to Group 7 - Cooling.
1. Inspect the accessory drive belt condition
and tension. Repair as required. Refer to
Group 7 - Cooling.
2. See A/C Expansion Valve in this group.
Replace the valve, if required.
3. See A/C Compressor in this group. Re-
place the A/C compressor, if required.
1. See Liquid Line, Suction Line and Dis-
charge Line in this group. Inspect the refriger-
ant lines for kinks, tight bends or improper
routing. Correct the routing or replace the re-
frigerant line, if required.
2. See A/C Expansion Valve in this group.
Replace the valve, if required.
3. See A/C Condenser in this group. Replace
the restricted A/C condenser, if required.
MAXIMUM HEATER OUTPUT
Engine coolant is provided to the heater core
through a heater valve and heater hose. With the
engine idling at normal operating temperature, set
the heater-A/C controls as follows:
• Temperature control in the full hot position
Correction