Mazda MX-5 1990 Workshop Manual page 758

TROUBLESHOOTING GUIDE
u
Case 2: Excessive refrigerant or insufficient condenser coofing
Measured pressure
Low-pressure side: Above 245 kPa (2.5 kg/cm
2
,
35.6 psi)
High-pressure side: Above 1,962 kPa (20 kg/cm2, 284 psi)
Condition
Insufficient cooling
Note
• If the condenser fan does not operate when the air conditioner is operating, see "Additional
(condenser) fan does not operate"; page
U-11,
before proceeding.
9MUOUX-084
GAUGE FITTING
Case 3: Air in system
Measured pressure
05UOUX-025
05UOUX-024
Step 1
1. Check the condenser for bent fins or damage.
Repair or replace if necessary.
2. If the condenser is OK, go to Step 2.
Step 2
1. Discharge the excessive refrigerant. (Refer to page U-28.)
Warning
• Always wear gloves and eye protection when dis-
charging the refrigerant.
2. Verify that the refrigerant pressure is normal.
Low-pressure side: Above 245 kPa (2.5 kg/cm
2
,
35.6 psi)
High-pressure side: Above 2,256 kPa (23 kg/cm2, 327 psi)
Condition
Insufficient cooling
CAUSE
ACTION
AIR IN SYSTEM
c) EVACUATE
SYSTEM
05UOUX-026
05UOUX-085
Step 1
Discharge the refrigeration system. (Refer to page U-28.)
Step
2
Evacuate the system to remove all air from it.
(Refer to page U-29.)
Step 3
Charge the system with refrigerant. (Refer to page U-29.)
Step 4
After charging, measure the refrigerant pressure.
(Refer to page U-31.)
Step 5
If low- and high-pressure sides are still too high, replace the
receiver/drier.
U-15