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INSPECTION PROCEDURE 1: When the A/C is Operation, Temperature Inside the Passenger Compartment does not Decrease (Cool Air is not Emitted).
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
The blower system or the compressor system may be defective if there is no cool air coming from the vents.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of blower motor
  • Malfunction of A/C control panel
  • Malfunction of A/C compressor
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, read the diagnostic trouble code.
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Check if an A/C control panel DTC is set.
(1) Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Refer to Diagnostic Trouble Code Chart .
Go to Step 2.
 
STEP 2. Check that the blower motor operation when the blower knob is moved to the "Maximum air volume" position.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the blower knob to the "Maximum air volume" position
Does the blower motor operate when the blower knob is moved to the "Maximum air volume" position?
Go to Step 3.
Refer to Inspection procedure 9 "The blower does not work ."
 
STEP 3. Check the rear window defogger and outside/inside air selection damper control motor operation.
(1) Turn the ignition switch to the "ON" position.
(2) Check the engine running.
(3) Check the operations of rear window defogger and outside/inside air selection damper control motor.
Do the rear window defogger and outside/inside air selection damper control motor work normally?
Refer to Inspection procedure 3 "The A/C compressor does not Work ."
Refer to Inspection procedure 2, "Malfunction of the A/C control panel power supply system ."