7B-1 Air Conditioning System: Manual Type
HVAC
Air Conditioning System
Manual Type
Precautions
A/C System Caution
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CAUTION
!
The air conditioning system of this vehicle uses refrigerant HFC-134a (R-134a).
None of refrigerant, compressor oil and component parts is interchangeable between two types of A/C
system: one using refrigerant HFC-134a (R-134a) and the other using refrigerant CFC-12 (R-12).
Be sure to check which refrigerant is used before any service work including inspection and
maintenance. For identification between these two types, refer to “Refrigerant Type Construction”.
When replenishing or changing refrigerant and compressor oil and when replacing parts, make sure
that the material or the part to be used is appropriate to the A/C system installed in the vehicle being
serviced.
Use of incorrect one will result in leakage of refrigerant, damage in parts or other faulty condition.
Precaution for Charging
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The refrigerant charge must be performed according to “Operation Procedure for Refrigerant Charging”. Also, the
check of refrigerant amount must be performed according to “Quick Checking of Refrigerant Charge” or “A/C System
Performance Inspection”.
Because, in the sub-cool system, the point at which bubbles disappear is in insufficient charged region, the amount of
refrigerant will be insufficient if the refrigerant charge is stopped at the point at which bubbles disappear. Also,
overcharge causes poor performance of the A/C system and poor fuel consumption.
Pressure of high pressure side
Bubbles disappear point
Proper amount of refrigerant
Insufficient charged region Stable cooling
performance region
Overcharged region
Refrigerant amount
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