| Step | Check | Symptom pattern |
|---|---|---|
| 1. Airflow | Radiator and oil-cooler fins clogged with dust; fan belts slipping; shrouds damaged | Overheats under load, fine at idle — the most common case |
| 2. Coolant circuit | Thermostat stuck closed; water pump play or weep-hole leak; collapsed hoses; coolant level and condition | Overheats in all conditions; slow warm-up points to thermostat stuck open |
| 3. Engine side | Injector condition, injection timing, head gasket (bubbles in the expansion tank) | Overheats with power loss; needs proper diagnosis before parts |
Safety first: never open a hot system; let it cool before checks. On machines with hydraulic oil coolers, clean both packs — hydraulic heat soaks into the same airflow.
The parts that resolve the majority of cooling failures: thermostat + gasket (cheap, scheduled lifespan anyway), water pump (replaced at overhaul or on weep-hole signs), hoses by set (soft or cracked = replace, not repair), radiator cap (holds system pressure; a worn cap mimics many faults), and fan belts. All are orderable by part number — send the machine serial with the photos.
If the machine must run before parts arrive: reduce load and rpm, schedule work in cooler hours, clean the fin pack daily, and watch the gauge — never push past shutdown temperature. Order the full cooling kit (thermostat, pump, hoses, cap, belts) in one shipment; it is a standard interval set anyway.
Tap to search the catalog, or send us the part number for a same-day quote:
Slow warm-up in cold weather suggests it is stuck open; overheating with cool upper hoses suggests stuck closed. Either way it is a cheap, interval part — replace it during any cooling repair.
Yes — send model + serial number and we quote the full set (thermostat, gaskets, water pump, hoses, cap, belts) in your chosen grade.
Minor clogging cleans with compressed air and water; bent fins are combed. Replace when cores leak, or when cleaning no longer restores airflow — send photos and we advise which side of that line you are on.
Send the part number, model or photos — in-stock items quoted fast.