Description
The Horton 994370 is a genuine OEM PolarExtreme seal kit for S and HT/S Advantage on/off pneumatic fan clutches, superseding 994205 with upgraded D-shaped seals in hydrogenated buna nitrile rubber (HBNR) for wider temperature tolerance and longer service life. The kit ships with all seals, O-rings, hardware, and the System Sentry check valve needed to restore proper air-chamber function and eliminate leaks.
Signs You Need a Fan Clutch Seal Kit
- Audible air leaks from the fan clutch assembly
- Fan clutch slow to engage or disengage
- Fan runs continuously regardless of engine temperature
- Fan fails to engage when cooling is needed
- Visible seal deterioration or cracking
- Intermittent or erratic fan clutch operation
Specifications
| Manufacturer | Horton (Genuine OEM) |
|---|---|
| Part Number | 994370 |
| Supersedes | 994205 |
| Kit Type | PolarExtreme Seal Kit |
| Model Family | S & HT/S Advantage |
| Clutch Type | On/Off Pneumatic |
| Seal Material | HBNR (D-shape) |
| Application | All Makes |
| Weight | 0.38 lbs |
| Package Dimensions | 7.8 x 8.8 x 1.1 in |
Kit Includes
- O-ring lubricant — Horton 17252 (1 pc)
- Spline lube — Horton 994067 (1 pc)
- Spline lube brush (1 pc)
- O-ring, large (Item 16) (1 pc)
- Cartridge assembly (Item 23) (1 pc)
- Face seal assembly (Item 24) (1 pc)
- O-ring, small (Item 26) (1 pc)
- Socket head screws (Item 29) — Horton 994262 (8 pcs)
- System Sentry check valve (Item 46) — Horton 994098 (1 pc)
- Umbrella check valve (Item 47) (1 pc)
Cross References
This seal kit replaces or is equivalent to the following part numbers:
- Horton: 994205 (superseded)
- Navistar / International: FLT4205, HOR994370, N806085S441
- Fleetrite: FLT4205
Applications
This seal kit fits all Horton S and HT/S Advantage series pneumatic fan clutches used on Class 6–8 trucks. Representative chassis applications:
- Freightliner FLD, FLC, Century Class, Columbia (1985–2007)
- Kenworth T600, T800, W900, T2000 (1985–2007)
- Peterbilt 377, 378, 379, 385, 386, 387 (1985–2007)
- International 9200, 9400, 9900 series
- Volvo VNL, VNM, WG, WIA, WCA
- Western Star 4900 series
- Mack CH, CL series
Verify your fan clutch model number (S Advantage vs. HT/S Advantage vs. earlier S series) before ordering to confirm this seal kit is compatible.