Volkswagen Corrado (1993 year). Manual - part 93

 

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Volkswagen Corrado (1993 year). Manual - part 93

 

 

A/C SYSTEM GENERAL SERVICING 

         Other Means Of Identification
         Refrigerant R-134a, when viewed through a sight glass, may
have a "milky" appearance due to the mixture of refrigerant and
lubricating oil. As the refrigerant and oil DO NOT exhibit a "clear"
sight glass on a properly charged A/C system, R-134a systems have no
sight glass.
         Audi, Mercedes-Benz and Volkswagen use Green bands/labels on
condenser, refrigerant lines, receiver-drier and expansion valve.
Lexus A/C system hoses and line connectors have a groove, a White line
and "R-134a" marked on them. See Fig. 3.

A/C SYSTEM GENERAL SERVICING 

         REFRIGERANT OILS

         Refrigerant R-12 based systems use mineral oil, while R-134a
systems use synthetic/Polyalkylene Glycol (PAG) oils. Using a mineral
oil based lubricant with R-134a will result in A/C compressor failure
due to lack of proper lubrication.
         Use ONLY specified oil for the appropriate system and A/C
compressor. Always check the underhood A/C specification label or A/C
compressor label before adding refrigerant oil to A/C
compressor/system. See Fig. 2. The following R-134a refrigerant oils
are currently available.

         Lexus
         PAG Refrigerant Oil (ND-OIL 8) with 10P/10PA swashplate
(piston) compressor. Synthetic Refrigerant Oil (ND-OIL 9) with
through-vane (rotary vane) compressor.

         Mercedes-Benz
         PAG Refrigerant Oil (001 989 08 03).

         Nissan
         PAG Refrigerant Oil (KLH00-PAGR0) with rotary vane
compressor. PAG Refrigerant Oil (KLH00-PAGS0) with piston (swashplate)
compressor.

         Saab
         PAG Refrigerant Oil (40 74 787).

NOTE:    Synthetic/PAG oils absorb moisture very rapidly, 2.3-5.6% by
         weight, as compared to a mineral oil absorption rate of
         .005% by weight.

         SERVICE EQUIPMENT

A/C SYSTEM GENERAL SERVICING 

NOTE:    Refrigerant R-12 service hoses will ONLY be labeled SAE
         J2196.

         R-134a manifold gauge sets can be identified by one or all of
the following:

  *  Labeled FOR USE WITH R-134a on set
  *  Labeled HFC-134 or R-134a on gauge face
  *  Light Blue color on gauge face

         In addition, pressure/temperature scales on R-134a gauge sets
are different from R-12 manifold gauge sets.

         SYSTEM SERVICE VALVES

         SCHRADER-TYPE VALVES

NOTE:    Although similar in construction and operation to a tire
         valve, NEVER replace a Schrader-type valve with a tire valve.

         Schrader valve is similar in construction and operation to a
tire valve. When a test gauge hose with built-in valve core depressor
is attached, Schrader stem is pushed inward to the open position and
allows system pressure to reach gauge.
         If test hose does not have a built-in core depressor, an
adapter must be used. Never attach hose or adapter to Schrader valve
unless it is first connected to manifold gauge set.
         Refrigerant R-12 Schrader-type valve cores have TV5 thread
size. Refrigerant R-134a Schrader-type valve cores use M6 (Metric)
threads. R-134a valve cores can be easily identified by use of "O"
rings and external spring. See Fig. 1.

         SERVICE VALVE LOCATIONS

SERVICE VALVE LOCATIONS TABLE

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Vehicle                           High                     Low

A/C SYSTEM GENERAL SERVICING 

 (1) - Information is not available from manufacturer.
 (2) - On high pressure line (near top of condenser on Integra;
       near receiver-drier on Legend; on receiver-drier on

 

 

 

 

 

 

 

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