Troubleshooting Contd

Symptom

Possible causes

Checks and corrections

Page

No blower control

Defective water temperature relay

Check for open

AC-9

Defective heat mode switch

Check for short

AC-9

Defective water temperature switch

Check for short

AC-20

Defective Hi-speed relay

Check for short

AC-9

Defective wiring connection

Check and repair

AC-9

Defective vacuum circuit

Check for leak and repair

AC-16

Interior temperature

Blown fuse or circuit breaker

Replace

AC-9

does not lower

Defective magnetic clutch

Check and repair

AC-23

Defective compressor

Check and repair

AC-23

Defective pressure switch

Replace

AC-9

Defective expansion valve

Replace

AC-4

Defective EPR

Replace

AC-4

Insufficient refrigerant in system

Check discharge refrigeration systerr

AC-11

Defective A/C switch

Check for short or open

AC-9

Defective temperature sensors

Check for short

AC-19

(in-car sensor, ambient sensor)

Defective rheostat

Check for short

AC 9

Defective power servo unit

Check operation

AC-17

Defective DVV

Check operation

AC-20

Defective amplifier

Check operation

Defective condenser motor

Check operation

AC-21

Defective A/C relay

Check operation

AC-9

Defective wiring connection

Check and repair

AC-9

Defective vacuum circuit

Check for leak and repair

AC-16

Interior temperature

Defective water valve

Check operation

does not rise

Defective temperature sensors

Check for open

AC-19

(in-car sensor. ambient sensor)

Defective rheostat

Check for open

AC-9

Defective power servo unit

Check operation

AC-17

Defective DVV

Check operation

AC-20

Defective amplifier

Check operation

Defective wiring connection

Check and repair

AC 9

Defective vacuum circuit

Check for leak and repair

AC-16

Unstable operation

Defective vacuum circuit

Check for leak and repair

AC-16

(hunting)

Poor connection of rheostat

Check and repair

AC-9

Defective power servo unit

Check operation

AC-17

Defective DVV

Check operation

AC-20

Defective amplifier

Check operation

Poor connection in wire

Check and repair

AC-9

Improper shifting

Misadjusted control lever or rod

Check and repair

of dampers

Disconnected control wire

Check and repair

AC-9

Defective dampers

Check and repair

AC-19

MXXXl

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