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A/C pressure switch F129

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A/C pressure switch F129Page 18757A/C pressure switch F129Functions At low or high pressure in the refrigerant circuit the low/high pressure switch (switch between terminals 1 and 2) switches the compressor off (via A/C Control Head E87). Switching pressures (in bar high pressure): Switch open (compressor off): Low pressure switch (opens at 1.2 bar and closes at 1.8 bar). High pressure switch (opens at 30 bar and closes at 14.5 bar). Switch closed (compressor on): 1.2 (1.8) bar to 30 (14.5) bar. Coolant Fan V7 is switched to second speed via the high pressure switch (switch between contact3 and 4). Switching pressures (in bar high pressure): Second speed of coolant fan engages at 16 bar (switch closes). Second speed of coolant fan is switched off at 12.5 bar (switch opens). of 26Refrigerant circuit servicing7/19/2005http://127.0.0.1:8080/au di/servlet/Display?action=Goto&id=AUDI .C5.HA01.87.4.57&type=repairPage 28758Removing and installing Remove front bumper Repair Manual Body Exterior Repair Group 50 body frontNotes: Disconnect harness connector. Remove pressure switch B: Tightening torque: 5 Nm. ORingseal A (10.8 mm x 1.8 mm) replace Page 8760 . With the switch removed bridge terminals 1 and 2 of connector B to check cooling performance. The refrigerant circuit remains closed connection with valve.Check function: Start engine Compressor switched on (operating mode "Auto" on A/C control head adjusted). of 26Refrigerant circuit servicing7/19/2005http://127.0.0.1:8080/au di/servlet/Display?action=Goto&id=AUDI .C5.HA01.87.4.57&type=repairPage 38759Compressor should run: Notes: Disconnect harness connector B from switch Compressor off (low pressure switch open). Remove switch A and connect connector B. Compressor is not switched on (low pressure switch open). Compressor not running: Disconnect harness connector B from switch A and bridge terminals 1 and 2 on connector BCompressor is switched on. If the compressor is sw ...

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