In Central Arkansas, heat is what tests a cooling system.
From June through September, afternoons in the mid-90s and heavy humidity push engines hard. A loaded truck crawling through the North Little Rock interchanges or sitting in I-630 traffic with the A/C on has almost no ram air through the radiator — the fan does all the work. Add a radiator partly packed with bugs and debris and a system that barely kept up in May can let go in July.
Overheating is one of the fastest ways to turn a cheap repair into an expensive one. A split hose can warp a head or damage a liner if the driver keeps pushing. Caught early, the problem is usually a hose, a clamp, a belt, or a fan clutch — not the engine.
Our Cooling System & Radiator Repair: what the mechanic handles
- Radiator and heater hose replacement
- Clamp and coolant pipe leaks
- Fan and serpentine belts, tensioners, and idler pulleys
- Fan clutch diagnosis — engaging when it should, and not dragging when it shouldn’t
- Fan clutch air solenoid and air line problems
- Water pump replacement on many engines, depending on access
- Thermostat replacement
- Coolant temperature and coolant level sensor faults
- Surge tank and pressure cap problems
- Pressure testing to find leaks
- Topping off with the right coolant for your engine
- Checking radiator and charge air cooler fins for bugs, cottonwood fluff, and debris
Jobs that belong in a shop
- Radiator replacement on trucks where it means removing the hood and front-end parts — often a shop job
- Radiator core repair and recoring
- Head gasket, liner, or oil cooler failures that put coolant in the oil or oil in the coolant
- EGR cooler replacement on engines where it requires major teardown
Milky oil on the dipstick or oil floating in the coolant reservoir means don’t run the engine. That points to an internal leak that needs a shop.
Fix it on site or tow it?
Hoses, belts, clamps, thermostats, fan clutches, and sensors are routine mobile repairs. If the engine ran hot briefly and was shut down quickly, replacing the failed part and refilling coolant often has the truck back on the road the same day.
A tow is smarter if the engine ran hot for a long time, shows signs of internal damage, or lost its coolant and kept going. Never open a hot radiator cap or surge tank — the coolant is under pressure and can cause severe burns. Let it cool before anyone touches it.
What to tell dispatch
Give us these details on the first call so the mechanic shows up with the right parts and finishes in one trip.
- How hot the gauge got and how long the truck ran that way
- Whether you see steam, coolant on the ground, or a burst hose
- Whether a belt broke or the fan isn’t turning
- Coolant warning lamps or fault codes
- Whether the engine is shut off now
Trucks & engines we service
- Freightliner
- Peterbilt
- Kenworth
- Volvo
- Mack
- International
- Western Star
Class 6 through Class 8 trucks, with engines from Cummins, Detroit Diesel, PACCAR, Volvo, Mack, Navistar, and Caterpillar.
Cooling System & Radiator Repair across Little Rock & Central Arkansas
Overheating calls around Little Rock peak from June through September. We see them in stop-and-go traffic on I-630, I-30 downtown, and the North Little Rock interchanges; on loaded trucks pulling north on I-40 toward Conway; and from trucks idling for hours at docks and jobsites with the A/C running.
Interstates we cover
Cities we cover
Cooling System & Radiator Repair FAQ
My truck is overheating. What first?
Get off the road safely, take the load off the engine, and shut it down if the gauge is in the red or a stop-engine lamp is on. Don’t open the radiator cap while it’s hot. Then call.
Can I add water to get off the interstate?
In an emergency, water can get you to an exit, but it dilutes corrosion and freeze protection. Have it drained and corrected with the proper coolant soon.
Why does it run hot only in traffic?
At low speed there’s no ram air through the radiator, so the fan does all the work. A fan clutch that isn’t fully engaging, or a radiator packed with debris, is a common cause.
Why does it run hot pulling a load uphill?
A sustained pull needs full cooling capacity at low road speed. A partly plugged radiator, a weak water pump, a sticking thermostat, or a slipping fan clutch may keep up on flat ground but fall behind under load.
Does coolant type matter?
Yes. Mixing incompatible coolants can cause problems. Tell dispatch your engine make so the right coolant is used.
How do I know if overheating hurt the engine?
Warning signs include coolant in the oil, oil in the coolant, white exhaust smoke with a sweet smell, or lost compression. A mechanic can pressure test and check for these before you run it again.