|
No Cooling From
System |
|
1. |
Blown
Fuse |
|
2. |
Broken or disconnected
electrical wire |
|
3 |
Broken or disconnected
ground wire |
|
4 |
Clutch coil or
solenoid burned out to disconnected |
|
5. |
Electric switch
contacts in thermostat burned excessively, or sensing
element defective. |
|
6. |
Blower motor
disconnected or burned out. |
|
7. |
Ignition switch ground
or relay burned out |
|
8. |
Loose or broken drive
belt |
|
9. |
Compressor partially
or completely frozen |
|
10. |
Coprocessors reed
valves inoperative-indicated by slight variation of both
gauge readings at any engine speed. |
|
11. |
Expansions valve stuck
open indicated by normal discharge pressure, high
suction pressure and evaporator
flooding. |
|
12. |
Heater valve in
operative-indicated by hot water in heater and hot
discharge air from evaporator |
|
13. |
Broken refrigerant
line |
|
14. |
Fusible plug blown
(not used on all systems) |
|
15. |
Leak in
system |
|
16. |
Clogged screen or
screens in receiver dehydrator or expansion valve.
Plugged hose or coil. |
|
17. |
Compressor shaft seal
leaking |
|
Top
|
|
INSUFFICIENT COOLING FROM
SYSTEM |
|
1. |
Blower motor
sluggish |
|
2. |
Compressor clutch
slipping |
|
3. |
Obstructed blower
discharge passage |
|
4. |
Clogged air intake
filter |
|
5. |
Insufficient air
circulation over condenser coils (fins clogged with dirt
or bugs) |
|
6. |
Evaporator clogged |
|
7. |
Outside air vents
open |
|
8. |
Insufficient
refrigerant in system |
|
9. |
Clogged screen in
expansion valve indicated by gauge pressures being
normal or showing slightly increased discharge pressure
and low suction pressure with evaporator air output
temperature high. |
|
10. |
Expansion valve
thermal bulb has lost its charge-indicated by too high a
low gauge reading and excessive sweating of evaporator
and suction line. |
|
11. |
Clogged screen in
receiver indicated by higher than normal reading on high
pressure gauge lower than normal reading on low pressure
gauge, and liquid lines cold to touch with possible
frost. |
|
12. |
Excessive moisture in
system indicated by excessive head pressure gauge
reading. |
|
13. |
Air in system -
indicated by excessive head pressure and possibly
bubbles in sight glass |
|
14. |
Thermostat defective
or improperly adjusted - indicated by low gauge reading
high or clutch cycling at too high a
reading. |
|
Top |
|
INTERMITTENT
COOLING |
|
1. |
Defective circuit
breaker, blower switch or blower motor |
|
2. |
Bad earth connection
or loose electrical connection in compressor clutch coil
or solenoid |
|
3. |
Compressor clutch
slipping |
|
4. |
Expansion valve icing
up - may be caused by excessive moisture in the system
or incorrect super heat adjustment |
|
5. |
Evaporator, coil icing
up - thermostat probe not in coil fins, thermostat
adjusted too low, defective thermostat. |
|
6. |
Clogged evaporator
fins |
|
Top |
|
NOISY
SYSTEM |
|
1. |
Defective winding or
improper connection in compressor clutch oil or
solenoid |
|
2. |
Loose or excessively
worn drive belts. |
|
3. |
Noisy
clutch |
|
4. |
Compressor noisy -
excessive wear in motor |
|
5. |
Loose panels on
car |
|
6. |
Compressor oil level
low |
|
7. |
Blower fan noisy -
excessive wear in motor |
|
8. |
Idler pulley and
bearing defective |
|
9. |
Excessive charge in
system - rumbling noise or vibration in high pressure
line, thumping noise in compressor, excessive head
pressure and suction pressure, bubbles or cloudiness in
sight glass or low head pressure |
|
10. |
Low charge in system -
hissing in evaporator case at expansion valve bubbles or
cloudiness in sight glass or low head
pressure |
|
11. |
Excessive moisture in
system - expansion valve noisy suction pressure
low |
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