AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual

AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual A4 1997 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/1113/w960_1113-0.png AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-21
 
     
Refrigerant system (R-134a), 
components 
     
A/C compressor
 
    
The compressor is driven via a belt on the engine when the A/C clutch 
engages (A/C ON).  
Low pressure refrigerant

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-22
      
Valve connections for pressure 
switches
 
    
A Schrader valve is installed under A/C system pressure switches to allow 
replacement without discharging the refrigerant system.  
Note:

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-23
 
    
A/C compressor speed sensor -G111-, (Zexel compressors 
only)
 
Note:  -  Inductive sensor (4 pulses per compressor rotation)
-  Determines A/C compressor speed; the A/C compressor clutch

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-24
      
Pressure relief valve
 
    
The pressure relief valve is mounted on the compressor. At approx. 38 
bar (551 psi), the valve opens to vent excessive pressure. When system 
pressure is red

Page 5 of 13

AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-25
      
A/C refrigerant high pressure switch -
F23- and A/C clutch switch -F118-
 
     
Note:  
     Beginning with m.y. 1997, A/C pressure switch -
F129- replaces pressure switches -F23-, and -

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-26
      
High pressure service valve assembly
 
    
Notes:  A - Service valve connection (located on condenser inlet line)
B - Schrader valve insert 
C - O-ring seal
D - Cap with seal
Only a high

Page 7 of 13

AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-27
      
Condenser
 
    
The condenser transfers heat from the compressed refrigerant gas to the 
outside air which causes the refrigerant to change state from a gas to a 
liquid.  
Note:  
Illus

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-28
      
Restrictor
 
    
The restrictor restricts and controls refrigerant flow to the evaporator thus 
lowering refrigerant temperature and pressure.  
Upstream of the restrictor, the refrigera

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-29
      
Evaporator
 
    
Liquid refrigerant entering the evaporator absorbs heat from air passing 
through the evaporator fins and cools the air. As the refrigerant absorbs 
heat it turns to vap

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AUDI A4 1997 B5 / 1.G Refrigerant System Components Workshop Manual 87-30
      
A/C refrigerant low pressure switch -
F73-
 
     
Function  
    
Switches A/C Clutch -N25- OFF if system suction pressure is too low (low 
refrigerant charge). This switch protects the
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