Technical Services Information
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1 Technical Services Information Keywords: Dash Air Conditioning, Air Conditioning, Automotive, Automotive Air Conditioner, Air Conditioner, AC, *.* Topic: Denso Dash Air Conditioner, Component Testing Issue Date: 0/8/00 The attached information is published with permission from Denso Sales California, Inc. Topic Source: Denso Sales California, Inc. File Name: DENSOTST.pdf Page of 8
2 COMPONENT TESTING Note: Please refer to the appropriate GM, Ford, Freightliner, or Spartan (thru mid-998) manuals when On-Vehicle Diagnosis indicates that the problem is caused by the following components:. Compressor and Magnetic Clutch. Receiver/Drier. Models with Electric Fan Motor for Condenser. Blower/Cooling Unit A. On Vehicle Inspection of Expansion Valve Figure 5: HVAC Cover Inspect A/C system visually and audibly. Next, inspect the system with a ROBINAIR (manifold gauge) or equivalent equipment. ) While turning A/C switch ON and BLOWER switch HI, run engine at,500 RPM for at least five (5) minutes and check A/C performance in RECIRC mode. ) If expansion valve is clogged, the low pressure reading will drop. If normal, the pressure will remain the same. ) If the low pressure reading is normal and A/C is not cooling, check for malfunction of expansion valve. B. Blower/Cooling Unit Removal ) Disconnect negative cable from battery. Figure 5: Fresh/Recirc Air Box ) Remove fresh/recirculate air box. (Fig. 5) 5) Disconnect wire harness at: (Fig. 55) Three () relays Blower Servo motor Two () connectors from thermostat Blower resistor Fresh/recirculate connector Pressure switch Main harness connector Figure 5: Battery Cable ) Remove refrigerant from the system using ROBINAIR or equivalent equipment. ) Remove HVAC cover on passenger side. Figure 55: Blower/Cooling Unit
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6 COMPONENT TESTING 5) Connect a jumper wire between terminals B and A of the cooling unit harness. A A A A 0.5GR 0.5WR 0.5WR 0.5GL 0.5Br 0.5Br 0.5Y A A A A A A 5A 6A 0.5GR 5A A 6A A A A A A A A A A ) Remove wire harness from pressure switch. ) Remove pressure switch from liquid line. D. Installation 0. Blower Follow reversal of steps for removal. A. On Vehicle Inspection ) Blower and Fan Operation Connect positive (+) lead from battery to terminal # and negative (-) lead to terminal # to confirm smooth operation of motor. Figure 86: Pressure Switch Connector 6) With the A/C system at normal operating pressures, check for continuity between terminals A and A for the high-low side and terminals A and A for the medium side. 7) If there is no continuity, replace the switch. C. Pressure Switch Removal ) Remove and disassemble blower/ cooling unit. (Fig. 87) M Figure 88: Blower and Fan Circuit 8A B B LW L 8A ) Blower Resistor Inspection. Inspect the resistor for specification. Checking for proper resistance of the blower motor resistor Pins Resistance Value 5.5Ω.8Ω.68Ω Indicates there is continuity between these terminals Blower Resistor connector Figure 87: Blower/Cooling Unit (disassembled) Figure 89: Blower Resistor 5
7 COMPONENT TESTING B. Blower and Fan Removal ) Disconnect negative cable from battery. ) Remove HVAC cover on passenger side. ) Remove blower motor -pin connector. ) Remove blower motor vent tube. 5) Remove three () screws mounting blower motor to the case. 6) Remove the blower motor and fan. NOTE: If the blower motor or fan replacement is required, follow the steps below. a) Remove clip from fan. b) Remove fan from blower motor. c) Replace fan or blower motor as required. C. Blower Resistor Removal. Relays Remove HVAC cover on passenger side to access the following three () relays: A. Main Relay Inspect five 5-pin main relay for continuity and replace the relay as required. Terminal No. Battery Voltage Not A Indicates there is continuity between these terminals Indicates terminals to which battery voltage is supplied Main Relay connector ) Disconnect negative cable from battery. Figure 9: Main Relay 86 B. Blower HI Relay Inspect -pin Blower HI Relay for continuity and replace the relay as required. Terminal No. Battery Voltage A B 50 8B Not Figure 90: HVAC Component Location + ) Remove HVAC cover on passenger side. ) Disconnect -pin connector from blower resistor. ) Remove two () screws from blower resistor. 5) Remove blower resistor. D. Installation Indicates there is continuity between these terminals Indicates terminals to which battery voltage is supplied Blower High Relay connector L 8B 0.5YG B A 0.5Br WB 5O B 8B Follow reversal of steps for removal. A 5O Figure 9: Blower Hi Relay
8 COMPONENT TESTING C. Mg/Cl (Magnetic Clutch Relay) Inspect -pin Mg/Cl Relay for continuity and replace the relay as required. Terminal No. Battery Voltage Not A I A E + 5) Remove linkage rod from servo motor. 6) Remove wire harness from servo motor. 7) Remove two () screws from servo motor. 8) Remove servo motor from air box. C. Air Intake Servo Inspection Check continuity of the servo according to the chart as shown. To check for voltage at the Air Intake Servo Sub Harness female connector, use chart below Indicates there is continuity between these terminals Indicates terminals to which battery voltage is supplied Magnetic Clutch Relay connector 0.5LW E 0.5WR A I 0.5LW 0.5BW A Main Harness Pin Switch Position Recirc (in) Fresh (recirc out).5yg.5yg.5yl I A E A Indicates terminals to which battery voltage is supplied Air Intake Servo connector Fig. 9: Magnetic Clutch Relay M. Air Intake Servo A. Air Intake Servo Operation The air intake servo changes the air intake door between the FRESH and RECIRC positions by rotating 80 in the clockwise direction every time the RECIRC switch on the control panel is depressed (RECIRC mode) or released (FRESH mode). 7B 6B 5B 7B 6B5B 0.5YL 0.5YW 0.5YG Fig. 9: Air Intake Servo Circuit D. Air Intake Servo Installation Follow reversal of steps for removal. NOTE: To check for proper operation of the Air Intake Servo, the ignition switch must be in the ON position. B. Air Intake (Air Box Fresh/Recirculate) Servo Removal ) Remove HVAC cover on passenger side to access the servo. ) Disconnect negative cable from battery. ) Disconnect connector for air box fresh/recirculate servo motor. ) Remove fresh/recirc air box.
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