Engine Overheating in Heavy-Duty Trucks: Causes & Fixes
Learn why heavy-duty truck engines overheat, how to read the gauge, step-by-step diagnosis, and how coolant, water pump, thermostat, and fan clutch fail.
Cooling System
- Articles
- 11
- Page
- 11
Articles
Fan Belt Tensioner: Failure, Replacement & Maintenance
What a truck fan belt tensioner does, why it squeals or vibrates, how to measure belt tension and how to replace a worn tensioner pulley bearing.
Water Pump: Faults, Replacement & Maintenance Guide
How the heavy-duty water pump keeps engine temperature in check, what fluid colour at the weep hole reveals about a failing seal, and safe replacement.
Truck Radiator & Expansion Tank: Faults, Replacement & Care
Diagnose radiator and expansion tank faults on heavy trucks: overheating, coolant loss, pressure caps, correct replacement steps and safe technical values.
Engine Coolant Thermostat: Faults, Replacement & Care
Heavy truck engine coolant thermostat guide: stuck-open vs stuck-closed faults, diagnosis, correct replacement, torque values and maintenance tips.
Viscous Fan Clutch: Fault, Replacement & Maintenance Guide
Heavy-duty viscous fan clutch guide: how it works, fault symptoms, diagnosis, correct replacement steps and safe technical values for trucks and buses.
Thermostat Failure Symptoms: Why Does the Engine Warm Up Slowly or Overheat?
Thermostat failure in heavy-duty trucks: stuck open delays warm-up and wastes fuel, stuck closed causes rapid overheating. Symptoms, diagnosis, and testing guide.
Engine Overheating on the Road: Emergency Guide
Truck engine overheating on the road? What to do in the first 60 seconds, when it's safe to keep driving, how to top up coolant, and when to call a tow.
What Is an Oil Cooler? Failure Symptoms and Rupture
What is an oil cooler and how does it fail? Oil cooler symptoms, leak direction, milky coolant, and rupture causes in heavy-duty trucks.
What Is a Radiator? Function, Core Blockage and Maintenance
What is a radiator and how does it work? Core blockage, airflow, leak testing, cap pressure and cleaning rules for heavy-duty trucks, explained in full.
What Is Antifreeze/Coolant? Red vs Green Coolant Difference, and When to Change It
What is antifreeze? A heavy-duty guide to coolant chemistry, red vs green differences, mix ratios, and when to change it.
