Complete Truck Repair Services in San Antonio, TX

Tri-County Diesel Service provides complete truck repair and maintenance services for all major big truck brands, including Ford, Kenworth, International, Peterbilt, Freightliner, Mack, GMC, Western Star, Volvo, Detroit, Cummins, and Cat. Our goal is to take care of all of our customers’ needs, from emergency repairs to maintaining a long-term preventive maintenance schedule. Here’s a list of our services, but if you don’t see what you need give us a call because we do it all!

  • Trailer Truck Electrical Service & Electrical Repair
  • Truck Oil Change / Lube Service
  • Truck Radiator Service - Coolant / Antifreeze Change / Flush
  • Truck Air Filter Replacement
  • Trailer Truck Brake Inspection, Service & Repair
  • Truck Exhaust / Muffler Service & Repair
  • Truck Transmission Service & Repair
  • Truck A/C Repair
  • Trailer Suspension Repair
  • Air Bag & Spring Repair
Preventive Maintenance

Preventive Maintenance

When you drive a truck, the best way to avoid serious breakdowns and minimize the high costs associated with truck repair is by doing routine maintenance and staying on a PM schedule. When trucks are properly maintained, problems can be predicted or prevented, and repairs can be completed before failure. We can help you plan service in advance–at the best possible time instead of the worst. If you do need a repair, we’ll work to get you back on the road quickly.

Truck A/C Service & Repair

Truck A/C Service & Repair

At Tri-County Diesel Service, we offer complete A/C repair and recharge services for trucks, ensuring your air conditioning system has a long and trouble-free life. We can quickly inspect your air conditioning, repair or recharge it, and have you back on the road in no time.

Diesel Repair

Diesel Repair

Today’s diesel engines are much more complex than in the past. At Tri-County Diesel, we have the knowledge and experience to troubleshoot and repair any issues you’re experiencing with your diesel truck. Our technicians know diesel and will get the job done right, the first time.

Air Brake Systems

Air Brake Systems

Brakes unavoidably wear out over time. How long they last is based on numerous factors, such as where you drive and how you brake. For this reason, it is necessary to service your brakes regularly. At Tri-County Diesel, we understand truck air brake systems, and can get you back on the road quickly whether you need service or repairs. We also provide a complimentary brake inspection with every service to make sure that any problem is addressed before it becomes a major concern.

Suspension Repairs

Suspension Repairs

Tri-County Diesel is one of the top repair shops in San Antonio for your truck’s suspension system, including struts, shocks, steering, and more. If your truck isn’t steering or turning as it should, or if you’re experience jolts and bumps as your drive, make an appointment today. Suspension issues are not only uncomfortable, they’re potentially dangerous. Let us make sure your truck is safe and driving smoothly.

Clutch Repair

Clutch Repair

As miles accumulate, your truck’s clutch will naturally degrade over time, and the clutch disc can wear down, especially if you’re driving in stop-and-go traffic. At Tri-County Diesel, we can handle all types of clutch repair services, including replacing the pressure plate, replacing the clutch disk, replacing the throwout bearing, resurfacing or replacing the fly wheel, and replacing any worn out hydraulic parts.