Driver comfort isn’t a luxury—it’s a necessity. At McCallon’s Diesel Services, we provide complete heating and air conditioning (A/C) repair and maintenance for diesel trucks and fleets across the St. Louis Metro, St. Charles County, Lincoln County, and Warren County. Whether it’s freezing Midwest winters or sweltering summer heat, our certified technicians keep your cab climate under control so you can stay focused on the road.
A/C Services
When your air conditioning system fails, it can turn long hauls into exhausting trips. Our team quickly diagnoses and repairs A/C issues to keep you cool and comfortable.
- A/C system diagnostics
- Compressor repair & replacement
- Refrigerant recharge & leak detection
- Condenser & evaporator service
- Blower motor repairs
- Cabin air filter replacement
Heating Services
A reliable heating system keeps drivers safe and comfortable during cold-weather hauls. We provide expert heating repair and preventative maintenance.
- Heater core repair & replacement
- Thermostat testing & replacement
- Coolant system service
- Defroster & vent repairs
- Complete heating diagnostics
Why Trust McCallon’s Diesel?
✔ Certified diesel technicians with HVAC expertise
✔ Service for single trucks and entire fleets
✔ Honest estimates with quick turnaround
✔ Preventative care to avoid costly breakdowns
✔ Serving the St. Louis Metro with 24/7 support available
Stay Comfortable Year-Round
Don’t let heating or A/C issues slow you down. Contact McCallon’s Diesel Services today to schedule your truck’s HVAC service and keep your cab comfortable in every season.