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HAIMA 7 Service Manual(MT)-U Heater and air conditioning system

Troubleshooting

Troubleshooting Troubleshooting The areas and steps for inspection are determined according to various malfunctions. Use the chart below to verify the malfunction symptoms in order to diagnose the related area. I. Insufficient airflow and/or no airflow from air ports 1 Insufficient airflow and/or no airflow from air ports. Malfunction description Possible causes 1. malfunction in air port or passage 1. malfunction in vent mode system: steps 1-4 2. malfunction in heat mode system: step 5 3. malfunction in defroster mode system: steps 6-8 Troubleshooting procedure Step Inspection Action 1 Inspect airflow mode control system of front climate control unit. • When airflow mode control knob is operated, check whether appropriate resistance can be felt and the knob can be moved to its full range freely. Yes No Go to next step. Go to step 1 of troubleshooting index no. 3. 2 Verify whether malfunction is in vent mode or other modes. • Does air blow out in vent mode? Yes Go to step 5. No Go to next step. 3 Inspect air port. • Is air port clogged? 4 Verify that duct in dashboard is installed. • Is duct in dashboard properly installed? 5 Verify whether malfunction is in heat mode or defroster mode. • Does air blow out in heat mode? Yes No Yes No Yes No Remove obstruction, and then go to step 9. Go to next step. Inspect air passage for clogging, deformity and air leakage, then go to step 9. Install duct securely in the proper position, then go to step 9. Go to next step. Check air port for clogging, then go to step 9. 6 Inspect defroster mode. • Dose air blow out in defroster mode? Yes Operation is normal. Recheck malfunction symptoms. No Go to next step. U-14

Troubleshotting Step Inspection Action 7 Inspect air port. • Is air port clogged? 8 Verify that defroster duct is installed. • Is defroster duct properly installed? Yes No Yes No Remove obstruction, then go to step 9. Go to next step. Check air passage for clogging, deformity, and air leakage, then go to next step. Assemble properly air passage in right position, and go to next step. 9 Verify if malfunction symptom occurs after repair. • Does air blow out? Yes Troubleshooting completed. Explain conditions to customer. No Recheck malfunction symptoms, and repeat from step 1 if malfunction reoccurs. Ii. Airflow of air port can not be changed. 2 Airflow of front air port can not be changed. Malfunction description Possible causes Malfunction in front blower system Malfunction in front blower, relay, front blower motor, front resistor, front fan switch or related harness: step 1 Malfunction in blower assembly: step 2-4 Troubleshooting procedure Step Inspection Action 1 Inspect blower system Inspect the systems and electrical parts listed below: Front blower motor relay Front blower motor Front resistor Front fan switch Relevant harness Are all these parts normal? Yes No Go to next step. Repair or replace the failed parts and go to step 5. 2 Verify whether malfunction occurs in blower assembly or elsewhere. • Turn ignition switch to on position. • Turn fan switch on. • Is there noise with blower in operation? Yes Go to next step. No Go to step 4. U-15

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