5 hours ago
A 2018 Kubota SSV75 experiencing cabin heating failure and an unresponsive A/C button likely suffers from electrical faults in the blend valve circuit or blocked heater hose flow—both common issues in compact equipment with electronically controlled HVAC systems. Resolving these problems requires a mix of mechanical inspection and electrical testing.
Kubota SSV75 Overview
The Kubota SSV75 is a vertical lift skid steer loader introduced in the mid-2010s, designed for heavy-duty material handling, grading, and snow removal. It features a 74.3 hp Kubota diesel engine, high-flow hydraulics, and a sealed cab with optional HVAC. Kubota, founded in 1890 in Osaka, Japan, has become a global leader in compact construction equipment, with the SSV series gaining popularity across North America for its durability and operator comfort.
The HVAC system in the SSV75 includes a thermostat, electronic blend valve, fan switch, and A/C control panel. These components work together to regulate cabin temperature, but faults in any part of the system can lead to heating or cooling failure.
Terminology Notes
The operator replaced the thermostat and the electronic control valve behind the cab, and confirmed that the coolant gauge reaches operating temperature. However, no hot air is blowing into the cab.
Next steps include:
The A/C button on the control panel does not illuminate, but the fan switch functions normally. This suggests that the A/C circuit may be disabled due to:
In Minnesota, a technician found that a Kubota SSV75 had a blend valve connector corroded from road salt exposure. Cleaning the terminals and applying dielectric grease restored full heating function.
In Oklahoma, a fleet operator discovered that heater hose shutoff valves had been closed during summer maintenance and never reopened. Once opened, hot coolant flowed freely and cabin heat returned.
Recommendations for Owners and Technicians
Heating and A/C issues on the Kubota SSV75 often stem from overlooked electrical connections or coolant flow restrictions. With a systematic approach—starting from the blend valve and working through the control panel and heater hoses—operators can restore cabin comfort and maintain productivity in all seasons.
Kubota SSV75 Overview
The Kubota SSV75 is a vertical lift skid steer loader introduced in the mid-2010s, designed for heavy-duty material handling, grading, and snow removal. It features a 74.3 hp Kubota diesel engine, high-flow hydraulics, and a sealed cab with optional HVAC. Kubota, founded in 1890 in Osaka, Japan, has become a global leader in compact construction equipment, with the SSV series gaining popularity across North America for its durability and operator comfort.
The HVAC system in the SSV75 includes a thermostat, electronic blend valve, fan switch, and A/C control panel. These components work together to regulate cabin temperature, but faults in any part of the system can lead to heating or cooling failure.
Terminology Notes
- Blend Valve: An electronically actuated valve that mixes hot and cold air to achieve the desired cabin temperature.
- Thermostat: A temperature-sensitive valve that regulates coolant flow to the heater core.
- Heater Hose Shutoff Valve: A manual or automatic valve that controls coolant flow to the heater core.
- Cabin Control Panel: The interface for adjusting fan speed, temperature, and A/C activation.
The operator replaced the thermostat and the electronic control valve behind the cab, and confirmed that the coolant gauge reaches operating temperature. However, no hot air is blowing into the cab.
Next steps include:
- Inspect Blend Valve Movement: With the cab raised and engine running, observe whether the blend valve actuates when switching from cold to heat. If it remains static, the issue may be electrical.
- Check Heater Hose Flow: Ensure that coolant is reaching the heater core. Look for shutoff valves near the engine that may be closed or clogged.
- Test Voltage at the Blend Valve Connector: Use a multimeter to confirm that the valve receives signal from the control panel. No voltage suggests a broken wire or failed relay.
The A/C button on the control panel does not illuminate, but the fan switch functions normally. This suggests that the A/C circuit may be disabled due to:
- Blown Fuse or Faulty Relay: Check the fuse box for HVAC-related fuses and relays. Replace any that are damaged.
- Control Panel Failure: If the A/C button does not respond, the panel itself may be faulty or disconnected.
- Low Refrigerant Lockout: Some systems disable A/C activation when refrigerant pressure is too low. Check pressure levels and recharge if needed.
In Minnesota, a technician found that a Kubota SSV75 had a blend valve connector corroded from road salt exposure. Cleaning the terminals and applying dielectric grease restored full heating function.
In Oklahoma, a fleet operator discovered that heater hose shutoff valves had been closed during summer maintenance and never reopened. Once opened, hot coolant flowed freely and cabin heat returned.
Recommendations for Owners and Technicians
- Raise the Cab Safely Before Inspection: Use proper supports and follow Kubota’s safety procedures.
- Label Heater Hose Valves for Seasonal Use: Prevent accidental closure during routine service.
- Use OEM Replacement Parts for HVAC Components: Ensures compatibility and longevity.
- Document Electrical Tests and Component Replacements: Aids future troubleshooting and warranty claims.
Heating and A/C issues on the Kubota SSV75 often stem from overlooked electrical connections or coolant flow restrictions. With a systematic approach—starting from the blend valve and working through the control panel and heater hoses—operators can restore cabin comfort and maintain productivity in all seasons.
