Cooling Systems & Overheating
An overheating diesel is a countdown, not a complaint. Heat warps heads and scores liners quickly, and the repair bill multiplies with every mile you keep rolling.
Maintenance & Systems
Stop the truck, then find the cause
If the gauge is climbing or a warning is up, get safely stopped and call us. We would rather arrange a tow than quote an engine. Continuing to run a hot diesel is how a thermostat becomes a head, and a head becomes an in-frame.
Once it is in the bay the causes are findable: a clogged or scaled radiator, a plugged charge air cooler, a failed fan clutch, a tired water pump, a stuck thermostat, a collapsing lower hose, air in the system, or coolant that lost its additive package years ago and started eating liners from the outside.
Florida heat plus load leaves no margin
A cooling package that is merely adequate in February fails in August with a loaded trailer on an interstate grade. Bugs and road debris pack radiator and charge air cooler fins, and nobody notices until capacity is gone. We clean and pressure test the whole package, check coolant chemistry rather than just level, and tell you honestly whether the system has margin left for summer.
Cooling work we handle
Cooling Systems & Overheating: scope of work
- Radiator repair, cleaning and replacement
- Charge air cooler inspection and leak testing
- Water pumps, thermostats and housings
- Fan clutches, shrouds and belt drives
- Hoses, clamps and coolant leak repair
- Coolant chemistry testing and system flush
Questions we hear
Straight answers
My temperature gauge climbs on grades but is fine on flat ground. Serious?
Yes, that is a system with no reserve capacity left. It is telling you it can only just cope, and the day it cannot will be the expensive one. Get it evaluated before summer or before a heavy haul.
Why does coolant chemistry matter if the level is fine?
Diesel coolant carries an additive package that protects cylinder liners from cavitation. When those additives deplete, the coolant is still green and still full while it quietly pits liners. We test rather than eyeball it.
Can you clean a plugged charge air cooler or does it need replacing?
Depends what is in it. Debris outside the fins cleans; oil fouling inside from a turbo failure usually means replacement, because leftover oil will foul the new turbo too.
Keep looking
Related services
Engine Repairs & Rebuild
From oil leaks to in-frame overhauls: heavy diesel engine work with straight answers about repair versus replace.
See this service SVC 02Belts, Hoses & Filters
The cheap parts that strand expensive trucks: serpentine belts, tensioners, hoses, clamps and every filter.
See this service SVC 03Towing
If the vehicle cannot come to us safely, we arrange the tow and the repair plan in one call.
See this serviceWhere we serve
Cooling Systems & Overheating across Northeast Florida
One shop at 3190 W Beaver St in Jacksonville, with customers from every direction: