Installing a Cab Heater on a Case 450 Skid Steer

[MikePhua]

Introduction to Cab Heating on the Case 450
For operators working in cold conditions, adding a cab heater to a Case 450 skid steer can make a world of difference. This simple upgrade enhances operator comfort during chilly mornings, improves visibility by reducing window fog, and helps machinery reach optimal operating temperature more quickly. A popular approach is to install a forced-air glycol heater behind the operator’s lower legs, a spot naturally warmed by existing coolant flow.
Terminology Note

• Forced-air glycol heater: A compact heater that circulates cab air across hot glycol (coolant) to provide warmth.
  
• Coolant circuit: The system of hoses and passages that allow engine coolant to circulate between the engine and accessories like heaters or radiators.
  
• T-fitting (tee): A plumbing component used to branch a single line into two directions; in this case, to divert coolant to and from the heater.
  

Selecting Coolant Connections
The first challenge is identifying ideal coolant entry and return points. You need a hot coolant line that feeds into the heater, and a return line flowing back to the engine’s low-pressure side. Ideally, you tap into:

• Hot coolant: from the hose near the engine block or heater core input—this is typically post-water pump flow.
  
• Return coolant: into the hose leading back to the radiator or pump return inlet, often found on the lower side of the engine block.
  

These spots provide sufficient flow without putting excess load on your cooling system.
Suggested Procedure

1. Park the skid steer on level ground, engine off, and let it cool completely.
   
2. Identify the high-temperature coolant hose and the cooler return hose.
   
3. Use high-quality T-fittings to splice into both hoses.
   
4. Mount the heater securely behind the operator’s lower-leg area to ensure airflow remains clear and efficient.
   
5. Connect the supply and return hoses to the heater inlet and outlet.
   
6. Refill the cooling system, bleed air via the high-point bleed screw (if equipped), and verify proper circulation.
   
7. Power the heater’s fan (often 12 V), test it, and confirm warm air flow into the cab.
   

Parameter Considerations & Practical Tips

• Heater size: Choose a heater rated around 5,000–12,500 BTU depending on cab insulation and cold climate needs.
  
• Hose diameter: Match the heater’s hose connection—commonly ¾″ or 1″—without creating sharp bends.
  
• Pump capacity: Ensure the existing water pump can handle the added flow; most stock systems manage small heaters fine.
  
• Safety features: Consider adding a thermal switch to prevent overheating or low-coolant running.
  

Real-World Anecdote
One operator recalled installing a similar setup on a different skid steer model during a hard Saskatchewan winter. He initially tapped the coolant just beneath the radiator outlet, but air locks formed in the lines. After relocating the inlet to a high point and installing a small bleed valve, the heater ran reliably, and the cab warmed in under five minutes—even with frigid starting temps.
List: Troubleshooting and Solutions

• Air trapped in the heater line → Install a bleed valve near the heater inlet.
  
• Weak or no fan airflow → Check power source and ground connections; ensure 12 V is stable.
  
• Visible coolant leak → Tighten hose clamps and recheck T-fitting seals.
  
• Inadequate heating → Confirm coolant flow; ensure the inlet comes from the hot side of the engine.
  
• Fan running but no heat → Heater core may be clogged; flush and clean.
  

Summary Checklist

• Locate hot and return coolant hoses
  
• Install T-fittings and run hoses to the heater
  
• Mount heater behind operator’s legs for effective airflow
  
• Refill coolant, bleed system, and check for leaks
  
• Power fan and test warm-air delivery
  
• Adjust and troubleshoot as needed based on performance
  

By blending thoughtful installation, correct component selection, and practical field testing, a forced-air glycol heater can transform the Case 450’s cab into a cozy winter cockpit—boosting both comfort and productivity.