How to Keep Your Pulling Vehicle Cool Between Runs

A hot summer track can turn a short gap between runs into one of the hardest parts of the day. A heavy diesel that has just made a full-throttle pull has stored energy in its coolant, oil, exhaust, turbocharger and tyres. Park it in full sun at a venue near Toowoomba or Dubbo, and the surrounding metal may keep heating long after the engine stops.

That matters because excess heat can reduce lubrication, accelerate seal wear and make the next pull less consistent. It can also create hazards for crew members working around hot pipes, exposed exhausts and pressurised cooling systems. A sensible cooling routine protects the vehicle, the people around it and the quality of every run.

The most effective approach is simple: prepare before the event, follow the same shutdown sequence after each pass and inspect the parts that carry heat rather than focusing only on the engine bay. A fixed routine works better under pressure, especially when a tight run sheet leaves little time for adjustments.

Know Where the Heat Comes From

A pulling engine operates at loads far beyond those of a road truck. During a run, the engine may spend several seconds at full boost while the transmission, driveline and rear tyres absorb the force. The turbocharger and exhaust system become extremely hot, and the cooling system must remove a large amount of energy from the engine and oil. A short drive back to the staging area does not guarantee that the whole vehicle has cooled evenly.

The radiator, intercooler, oil cooler, intake system and exhaust all create their own problems. A blocked radiator screen can reduce airflow even when the coolant level is correct. A restrictive air filter may encourage the engine to run hotter under load. Heat-soaked hoses and wiring can fail later rather than at the moment when a component first becomes damaged. The tyres and wheel hubs also need time to shed heat, particularly after several heavy passes.

Australian conditions can make the job tougher. Summer air can exceed 35°C in inland Queensland or South Australia, while dust from a dry paddock can cover radiator screens and air intakes. At a regional meet, the pulling area may also be exposed with little natural shade. Anyone starting with a bare chassis rather than modifying an established truck should work through choosing a pulling vehicle before ordering a cooling package, since cooling capacity, weight and service access should be considered together.

Build a Cooling Routine for Every Run

Assign one person to watch the clock during the run schedule. A cooling routine is easier to follow when each person has a clear role: one monitors the engine, another checks the vehicle and a third handles the water and recovery equipment. The timing should match the actual event, because some tracks allow several minutes between passes while others run a continuous sled format with only brief recovery time.

Use the same shutdown sequence each time. Bring the engine back to idle, disengage the drive, apply the parking brake and switch off the engine. Let the turbocharger and exhaust cool without adding throttle. Open the bonnet or side guards where track rules allow, then position battery-powered fans to direct air through the radiator and around the exhaust. A fan aimed at the wrong area may move hot air without cooling the parts that need attention.

Never pour cold water over a hot radiator, exhaust manifold or turbocharger. Sudden temperature changes can crack castings and damage seals. Likewise, do not remove a cooling-system cap while the system is hot and under pressure. Use the overflow reservoir or a safe external temperature check to assess the coolant condition. If the vehicle is being transported after the event, allow it to cool before covering it with a canopy or placing it inside a closed trailer.

At many Australian backyard tracks, support vehicles are carried by a ute, and cooling equipment is often part of a shared trailer load. Keep fans, gloves, a fire extinguisher, drinking water and basic tools together in one accessible box. Label the equipment and nominate the person responsible for it rather than leaving the job to chance.

Protect Coolant, Oil and Airflow

Before the first run, check the coolant level and condition using the procedure in the engine manufacturer’s manual. The mixture should suit the local climate and the antifreeze protection required for the event. Australian summers can be hot, but winter frosts still occur in inland areas, so a coolant intended only for warm weather may not provide suitable protection throughout the year.

Inspect radiator screens and the area in front of the cooler package. Grass, chaff, dust and insects can restrict airflow, particularly after a vehicle has crossed a dry paddock. Clean the screens while the engine is cool and according to the rules of the venue. Check fan operation, belt tension and hose condition before loading the vehicle. If the engine has been operating at unusually high temperatures, investigate the cause rather than simply increasing the mixture of coolant or fitting a larger fan.

The intake and intercooler need equal attention. Check the air-filter housing for dust, oil contamination or a loose cover. A damaged intake hose can allow unfiltered air into the engine and may create a safety issue around a turbocharger. Inspect the intercooler face for packed debris, and confirm that the charge-air pipes and clamps are secure. Clean oily components away from hot surfaces so they do not catch fire.

Watch oil level and temperature during the event, following the manufacturer’s specified checking procedure. An oil leak may only become visible when the engine is hot and under pressure, so look beneath the sump as well as around the filter housing. Refuelling deserves the same discipline. Stop the engine, move away from hot exhaust components and follow the track’s fuel-handling rules. Check for water in the fuel, keep the tank cap secure and never leave a container beside an operating or recently shut-down engine.

Inspect the Parts That Carry Heat

Tyres require a cool-temperature inspection. Run a hand around the sidewall and tread looking for cuts, bulges, embedded objects and separation. Heat can raise pressure, so do not bleed air from a hot tyre merely to reach the cold pressure listed on its sidewall; it may then be seriously underinflated when it cools. Check pressures against the event rules and the vehicle manufacturer’s guidance, and inspect wheel studs, nuts and hub areas after the first pass.

The driveline may show signs of heat through oil leakage, damaged seals or unusual noises. Listen for changes in transmission operation and check the area around the driveshaft joints. Confirm that the clutch, gearbox and final drive are clean before the next run. A leaking fitting can look minor while the vehicle is stationary but throw oil onto a hot exhaust during the next pull. Do not tighten a leaking component until it has cooled enough to handle safely.

Watch for heat-related damage to guards, wiring and fuel lines. Many modifications are close to the turbocharger or exhaust, where radiant heat can remove insulation and harden plastic. Use heat-resistant coverings where suitable and keep electrical connections away from moving or hot parts. After each run, look for melted insulation, scorched wiring, loose fasteners and fluid marks.

Crew members also need protection from heat. Hot gloves, eye protection and a clear exclusion zone around the exhaust are more useful than rushing into a narrow repair. If a serious leak, overheating warning or mechanical failure appears, stop the vehicle and inform the track official. A missed run is preferable to fire, lost control or a damaged engine turning into a hazard for everyone nearby.

Plan for Local Events and the Next Run

Australian pulling often runs through regional clubs, local sponsors and community-backed meetings rather than a single national circuit. Entry fees, prize money, scrutineering and technical support are commonly organised by the host club or promoter. Parts and fabrication work may involve specialist truck and tractor workshops, while local businesses often provide fuel, transport, timing equipment or prize support. Knowing who is responsible for each part of the day helps a crew prepare its cooling plan properly.

Regional venues also differ in their facilities. Some Australian tracks provide a dedicated warm-up area, water supply and shaded paddock; others offer little more than a graded strip and a collection of portable toilets. Contact the club before travelling and ask about arrival times, fuel rules, recovery arrangements and where support vehicles may park. Bring enough coolant, fuel and drinking water for the conditions rather than relying on a nearby town being close enough to reach during a short break.

The vehicle should arrive ready to compete, not merely ready to start. Conduct a full cooling-system inspection, confirm the radiator and intercooler are clear and run the engine long enough to check fan operation, gauges and possible leaks. Record temperatures and any changes in oil pressure, coolant level or engine behaviour. Those notes make the next adjustment based on evidence rather than guesswork.

Before loading the ute, check association schedules and forms, download the current entry paperwork and confirm the venue and safety requirements with the local club. Pack the cooling kit, mark the emergency contacts and brief every crew member on their role. Arrive early enough to inspect the vehicle in event conditions, then make the next run a controlled and predictable part of the day.