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  #1  
Old 06-02-2010, 10:07 AM
2nd Gear

 
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Default A/C compressor clutch not engaging

After doing the complete 'drive belt' thing and changing the clutch, the A/C compressor won't come on anymore; not sure though if it DID work prior to the clutch work.

I assume it is an electrical connection from the control unit that activates the clutch?

What wire/connectors/sensors/switches should I start checking to troubleshoot the problem?

Could it be 'rusted' in? I can spin the clutch (inside the the A/C drive pulley).

Suggestions, please.
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1998 Audi A4 1.8T Quattro, dark blue, K03/K04+ hybrid, Carbonio CAI, APR Inlet Tubes, APR R1 diverter, GIAC PC16, 31lb inj, 20x6x2.75 FMIC, 185 g/s MAF flow, DP 'sport cat, Milltek CB Exh, Podi Boost Gauge, 17" OZ F1 225/45-17, PowerSlot, Hawk Pads, SB Stage III clutch; 1996 Audi A 2.8 Quattro auto, stock, 2002 AR 6 spd lower wider Stg2 cust
  #2  
Old 06-02-2010, 02:04 PM
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Did you unplug the connector that is located behind the passenger side headlight, on the side of the condenser, that would cause that... Otherwise youll want to check the A/C pressure, and/or check for codes with a VAG to see whats going on.
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  #3  
Old 06-02-2010, 02:22 PM
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Default

Quote:
Originally Posted by Dallas09 View Post
Did you unplug the connector that is located behind the passenger side headlight, on the side of the condenser, that would cause that... Otherwise youll want to check the A/C pressure, and/or check for codes with a VAG to see whats going on.
I will locate and check the passenger headlight connector first.
Then check VAGcom codes for the A/C module.
IF pressure were low (leak), would that also prevent the compressor clutch from engaging?
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1998 Audi A4 1.8T Quattro, dark blue, K03/K04+ hybrid, Carbonio CAI, APR Inlet Tubes, APR R1 diverter, GIAC PC16, 31lb inj, 20x6x2.75 FMIC, 185 g/s MAF flow, DP 'sport cat, Milltek CB Exh, Podi Boost Gauge, 17" OZ F1 225/45-17, PowerSlot, Hawk Pads, SB Stage III clutch; 1996 Audi A 2.8 Quattro auto, stock, 2002 AR 6 spd lower wider Stg2 cust
  #4  
Old 06-02-2010, 02:29 PM
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Yep, the connection you are checking is the connection to the pressure switch. This checks for too high or too low pressure and will turn off the compressor (this protects it). If this switch were disconnected, faulty (check that after youve done everything else), or if there is little or no refrigerant in the system, it will prevent the compressor from engaging. A VAG code will be thrown if the switch thinks the pressure is too low. So if you check the pressure with a manual reader on the low service side, and you have pressure you know its a problem with the switch most likely, if you dont have pressure its because you have a leak and all of the refrigerant has escaped.
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Old 06-02-2010, 02:29 PM
 
 
 
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18t, a4, ac, amount, audi, b5, clutch, clutches, compressor, engage, engaging, free, low, pressure, side, spin


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