White Smoke at Cold Idle, Inad. Cab Heat (Install New Fan Blade/Fan Clutch Kit)
| Subject: | White Smoke at Cold Idle, Inadequate Cab Heat/Defrost Temperature in Cold Weather Conditions (Install New Fan Blade and Fan Clutch Kit) |
| Models: | 1990-99 Chevrolet and GMC 6-7H Medium Duty Conventional, 7T School Bus Models |
| with 3116 and 3126 Caterpillar® Diesel Engines |
Condition
Some owners/operators may comment about cold weather operation of the above vehicles in low ambient temperatures. The conditions may include possible white smoke at cold idle or inadequate cab heat/defrost temperature.
Cause
These conditions may be caused by extended idling or stationary light engine load operation which does not allow the engine to maintain the proper thermostatic coolant temperature in cold weather. However, this condition is considered normal.
Correction
New Horton Electromagnetic electric fan clutch kits and fan blades have been developed for those customers who desire to modify the vehicle to address this condition. These fan clutches feature a slower disengaged speed that will assist in maintaining the engine temperature in cold weather operation.
Important: The reinforced fan blades and the Horton fan clutches must be used as a set.
These fan clutch kits must be used with the fan blade part numbers listed below. These fan blades have reinforced center hubs that were approved for use with the Horton clutches. Steel fan blades are standard with all the 3126 Cat® production engines equipped with viscous fan clutches.
Refer to the Engine Cooling subsection of the appropriate year Medium Duty Service Manual for fan clutch replacement procedures.
Parts Information
P/N | Description | Quantity |
|---|---|---|
15042287 | Clutch Kit, Fan - A/C R12 (1990-95) | 1 |
15042288 | Clutch Kit, Fan - A/C R134a (1996-99) | 1 |
15042289 | Clutch Kit, Fan - Non A/C (1990-99) | 1 |
15031816 | Blade Asm., Fan - 24" | 1 |
15032513 | Blade Asm., Fan - 25" | 1 |
15031815 | Blade Asm., Fan - 26" | 1 |
Parts are currently available from GMSPO.
Warranty Information
Electric Fan Clutch kits are not considered a warranty repair. Parts and Labor charges are the responsibility of the customer.
