Frontier XE King Cab 4WD L4-2.4L (KA24DE) (1998)
Idler Pulley: All Technical Service Bulletins
A/C - Idler Pulley Whine Noise at 3000 rpm
Classification:
HA99-006
Reference:
NTB99-070
Date:
October 5, 1999
A/C IDLER PULLEY WHINE NOISE AT 3000 ENGINE RPM (FOUR CYLINDER ENGINE ONLY)
APPLIED VEHICLES:
1998-2000 Frontier (D22) - 2WD
2000 Xterra (WD22) - 2WD
APPLIED ENGINE:
KA24DE only
SERVICE INFORMATION
If an applied vehicle exhibits a whine noise at or around 3,000 engine RPM, the cause may be the air conditioning (A/C) idler pulley. Use the service
procedure listed below to diagnose and correct the incident.
SERVICE PROCEDURE
1.
Run the engine at or around 3,000 RPM with the A/C ON and OFF to determine when the whine noise occurs.
NOTE:
The A/C will operate with the A/C button turned off if the mode selector is in the foot/defrost or defrost position and the fan is turned on. To ensure
the A/C is off, move the fan speed selector to the off position.
A.
If the whine noise occurs with the A/C off (A/C compressor not operating), look for other sources of the whine noise.
B.
If the whine noise only occurs when the A/C is on (A/C compressor operating) and the noise can be pin pointed to the idler pulley with a
stethoscope or Chassis Ears(TM), proceed with step 2.
2.
Remove the engine under cover.
3.
Loosen (but do not remove) the nut that secures the idler pulley (see Figure 1).
4.
Remove the E-ring from the idler pulley adjusting bolt (see Figure 1).
5.
Remove the idler pulley adjusting bolt.
6.
Remove the A/C compressor drive belt from the idler pulley.